®l)e €omtnonioealtf) of Massachusetts. BOARD OF GAS AND ELECTRIC LIGHT COMMISSIONERS. REPORT OF AN Investigation Relative to Establishing a Calokific Standard foe Gas. Under Chapter 167 , General Acts of 1916 . By Charles D. Jenkins, Inspector of Gas. BOSTON: WRIGHT & POTTER PRINTING CO., STATE PRINTERS, 32 DERNE STREET. 1917. Publication of this Document APPROVED BY THE Supervisor of Administration. I i I i GG&7 [^ 3^3 ns \ ®l v ^mmonrocaltf) of ittassadjusete. EEPOET OF AN INVESTIGATION EELAT1VE TO ESTAB¬ LISHING A CALOEIFIC STANDAEI) FOE GAS. r - ' Board of Gas and Electric £ight Commissioners. Gentlemen: —In compliance with your instructions I have the honor to submit a report on the work of my department relative to the establishment of a calorific standard for the gas of the companies under your supervision. As a preliminary to the main body of this report it may be proper and well to say that, due to much research the conclu¬ sion has been reached throughout the scientific world that in the interest of consumer and producer the calorific standard and not the candle-power standard, should prevail and does prevail. The reason for this change of standard is, briefly, that the great bulk of the gas now used is for heat purposes, and obviously it is of prime importance to the consumer that he be supplied with a gas which will give him the best service in view of the use he makes of it. Nineteen plants were designated by the Board for experi¬ mental purposes, a list of which with a description of their equipment appears in Appendix A. These nineteen plants were ree to undertake the manufacture of gas to a calorific basis instead of a candle-power basis, but otherwise complying with all the legal requirements. The experimental period was for six months, and has been extended from time to time and is still in force. The various plants were to make daily tests and report weekly the average calorific value and candle power, with a is ory of the gas, its analysis, quantities made, analyses of 4 raw materials and such other information as would have a bear¬ ing on its quality. As a check on this work the State inspectors were to make their usual routine tests unannounced and at ir¬ regular intervals, a comparison of these single tests being made with the company reports for the week. On consultation with the inspectors modifications were to be made and experiments carried on in a spirit of co-operation, endeavoring always to improve the efficiency of the gas service. Calorimeters. For the determination of calorific value a water-flow type of calorimeter w r as used, the Hinman-Junker being quite generally installed at both the official testing stations and works stations. The British thermal unit adopted in the law is the quantity of heat required to raise the temperature of 1 pound, avoirdu¬ pois, of water 1 degree Fahrenheit. The science of gas cal¬ orimetry, however, was developed in the laboratory and metric measurements used, the unit being the “Calorie,” which is the quantity of heat required to raise 1 kilogram of water 1 degree Centigrade; this unit is still in use in France and other countries. At the testing stations the gas supply was taken off exactly as for candle-power determinations; in fact, some of the calor¬ imeter gas supplies were extensions of the photometer supplies. At the works testing stations many plants used averaging tanks either of the continuous-flow type or of the gas-holder type, and they have been found to give satisfactory results. For the official testing stations it was necessary that the in¬ spectors should be able to control quickly the temperature of inlet water to calorimeter. After some experimenting the fol¬ lowing installation was adopted. A No. 2 flush tank w T ith ball cock on inlet was placed 8 to 9 feet from floor, the outlet to calorimeter flowing through a 5-inch diameter strainer of 40- mesh copper gauze. A visible waste indicator was introduced on the overflow line from inlet weir to calorimeter at the height of the eye; and it w T as found very useful, as the minimum amount of water could be wasted and yet a constant level insured by an easy inspection of the indicator in line with the thermometer reading lenses. The water supply to tank came through a gas 5 tank heater. On the outlet was a brass cross (all the piping being one-half inch brass) carrying a thermometer, reading to single degrees with an open scale, and two lines, with valves, one to waste and the other to tank. On the tank line a safety valve was introduced before the valve. The temperature of water flowing to supply^tank could be nicely regulated to room temperature, and was further made more uniform by a stirrer introduced into tank. When the conditions were favorable for a test the gas and water were shut off at heater, and the inlet temperature at calorimeter generally was held to within one one-hundredth of a degree Fahrenheit. p Calculation of Heat Values. The form used for recording observations is shown in Ap¬ pendix D and the tables for computation in Appendix E. The method of calculation has been simplified by the adoption and use of a table of co-logarithmic factors (Table C, Appendix E); these are the co-logarithms of the amount of gas actually used, corrected for temperature and total pressure, when two-tenths of a cubic foot are passed by the meter. Thus the calculation is simplified to adding the logarithms of weight of water found and the corrected difference (Table A and thermometer correc¬ tion) of temperature of inlet and outlet water and the logarith¬ mic factor from Table C; to the number corresponding to the logarithm thus found is added 1 Btu 1 for heat loss and the correction for humidity from Table E, the result being total British thermal units. For purposes of comparing results “efficiency factors” were developed, that for coal gas being Btu’s per pound of coal, and for the oil in water gas a factor was developed from the formula B— 3 qq ( 10 °o- so A ) ? w h ere g j s observed total heating value of the carbureted water gas, and A, the number of gallons of oil per thousand cubic feet- the values, 300 Btu’s for blue water gas and 80 cubic feet gas per gallon oil, have been checked by one of the companies. 2 The oil factors are for Btu’s per cubic foot from the oil used. The results for the year appear as Appendix F. 1 Bureau of Standards, Circular No. 48, p. 171. 2 Haddock, Nov. 20, 1916. 6 Experiments. In addition to installing, calibrating and checking calorim¬ eter apparatus, and making routine tests, various experiments were carried out in the study of the effects on gas manufac¬ tured to a calorific basis. As a sequel to experiments pre¬ viously made, showing the varying development of light in different burners, more particularly open burners, tests were made on the effect on candle power of gases made to a cal¬ orific basis. Experiments were also carried out on the effect of distribution on calorific value, on the effect of adding super¬ heated steam to vertical retorts and on oil washing. Burners. Gas has been valued for many years on a candle-power basis; this was useful in the earlier days of gas lighting, as the chief use of gas was for light developed by burning the gas in some form of burners. As the art developed the so-called Argand type of burner was found to give the most light, and was used for testing at the time supervision began to take form; this type has been refined until to-day the Carpenter “Metropolitan No. 2” burner is recognized as the standard for scientific testing. In the early days some form of Argand burner was in fairly general use, as it developed considerable light from the gas; under these conditions the consumer ob¬ tained practically the same amount of light as the supervising authorities certified, but with the increasing candle power, the improvement of open burners and the more general use of gas, open burners became almost universally used, while the testing was continued with burners “that were best adapted to the gas.” When incandescent gas lighting became common the discrepancy was still further increased between the light the .consumer obtained and what the supervising authorities stated the gas possessed. These facts, added to the comparative crudeness of testing, made it desirable to consider some more scientific method of valuing gas. As bearing on this subject a great many tests of candle power as developed by different burners and gases were made with the testing Argand and a typical open burner; the details appear in Appendix H. Tests 7 were made in 1910 and 1912 at routine inspections when com¬ panies were operating under a candle-power basis; in 1916 tests were made of groups of candle-power and heat-unit com¬ panies. Formerly, owing to the relatively high candle-power gas supplied, consumers could realize in open burners nearly the candle power of the gas as tested, but as the candle power, shown by official testing, dropped, the relative loss in open burners was more marked. Some tests were made of two types of open burners; with the high candle-power gases these burners had the same efficiency, but with a 14.5 candle-power mixed gas the following results were obtained: — Pressure (Inches of Water). Burner A. Burner B. Actual Candle Power. Candle Power per Cubic Foot. Actual Candle Power. Candle Power per Cubic Foot. 2.0,. 5.1 1.08 11.0 2.01 5.5 0.98 11.7 1.97 5.6 0.83 13.3 1.97 The difference in light given per cubic foot between 0.83 candles and 2.01 candles is marked, especially as the Argand testing burner gave 2.9 candles per cubic foot, and the incan¬ descent would give 18 candles per cubic foot. Nearly ten times the light per cubic foot can be obtained from this quality of gas by using it in an incandescent rather than an open burner; if an open burner must be used, certainly the best type should be chosen. The summary follows, also a comparison in percentages of loss of candle powder when using gas in an open burner: — 1910. 1912. 1916. Loss in Open Burners, 1912-16. Argand. Open. Argand. Open. Argand. Open. Candle Power. Per Cent. Water gas, . 19.84 19.51 20.27 19.98 16.80 9.48 10.50 52.5 Coal gas, 16.43 14.89 16.76 14.53 16.10 12.27 2.26 15.6 Mixed gas, . 17.85 16.35 17.75 15.68 16.83 12.25 3.43 21.9 8 1916 Candle-Power Companies. Heat-unit Com¬ panies. Loss in Open Burners. Argand. Open. Argand. Open. Candle Power. Per Cent. Water gas, 16.80 9.48 14.47 8.43 1.05 11.1 Coal gas, .... 16.10 12.27 15.50 11.37 0.90 7.3 Mixed gas, 16.83 12.25 15.08 10.12 2.13 17.4 Distribution. It is well known that the candle power developed at the works is not always delivered to the consumer in its entirety, either under low pressure for short distances or high pressure for long distances. In studying the effect of distribution of gas made to a calorific basis, high-pressure distribution was used to accentuate the effect. Old Colony. A test was made of the water gas supplied under high pres¬ sure by the Old Colony Gas Company during September, 1916; this was a warm period, and the gas showed comparatively little loss from compression and probably none from atmos¬ pheric conditions. The works experiments were not wholly satisfactory, as the tests were on isolated samples and not aver¬ ages of gas; however, there was an apparent loss of 6.4 Btu’s between the holder and after the compressor; these tests were made during the make, gas being made into the holder through the purifiers until 1 p.m. September 13. The plant was then shut down for twenty-four hours and the system supplied from this stock. In the afternoon, at the Vine Street, Weymouth, testing station (approximately 1 mile from the East Braintree works), there was a gain of 23.7 Btu’s to 551.4; this represented the value of the stock of gas in the holder after being com¬ pressed and sent 1 mile. The next morning, at Whitman, 12 miles from the works, tests were made at Roberts’ Tack and Nail Company after the gas had been stored since 1 o’clock of the previous afternoon and the system kept filled at 10 pounds’ pressure; the results, 531.7 Btu’s showed a loss of 3.6 per cent. 9 Btu’s and the uniformity of gas, checked in the afternoon of the same day at Vine Street, Weymouth, as 552.8 Btu’s. The following tables show results and analyses: — Works, After compressor, Testing station, Whitman, Testing station, Place. Date. B. T. U September 13, ... 534.1 September 13, ... 527.7 September 13, ... 551.4 September 14, 531.7 September 14, ... 552.8 Analyses {Per Cent, by Volume). After Com¬ pressor. Testing Station. Twelve Miles under 10 Pounds. Ethylene,. 6.77 7.04 8.88 Benzol, etc.,. 2.01 1.86 0.79 Marsh gas,. 9.10 10.16 10.39 Hydrogen,. 41.05 40.50 37.93 Carbon monoxid,. 34.13 34.31 36.01 Nitrogen. 2.43 2.24 2.55 Oxygen,. 0.17 0.14 0.21 Carbon dioxid,. 4.34 3.75 3.24 Maiden-Rev ere. In October, 1916, and again in February, 1917, tests were made for loss of Btu’s from distribution on a 6-inch pressure line between Malden and Revere, a distance of 6 miles. In the first series gas was taken from the line to compressor and holder; an average of 70 per cent, water gas for the first day was mixed with the coal gas before the station meter, but the mixture fluctuated with the coal-gas production. On the sec¬ ond day only 50 per cent, water gas was used. For the series of tests in February, 1917, the gas at Malden was taken after the compressor, with 30 pounds pressure, and reduced through an individual governor to 5 inches; thus the conditions, as compared with those of October 5, were less severe, and showed the effect only of distribution and weather, while the October 10 tests showed, in addition, the effects of compression. In Octo¬ ber the first test, on the 4th, was of gas at the usual pressure of about 8 pounds, while the second test, on the 5th, was of gas under 30 pounds, a pressure used when the occasion demanded; the flow was at the rate of 33,000 cubic feet per hour the first day, and at 65,000 cubic feet the second day. At Revere the gas for test was taken off just after the reducing governor. Under the 8 pounds’ pressure there was an actual increase found in the heat value at Revere, while under 30 pounds’ pressure the loss was 1.62 per cent. B. T. V., Oct. 4 , 1916, 8 Pounds Pressure. Time. Malden. Revere. Time. Malden. Revere. 10.00. 559.4 - 2.00, .... 540.0 534.9 10.30. 549.2 - 2.30. 551.6 546.7 10.50, .... - 560.0 3.00. 532.6 554.5 11.00, .... 564.4 575.2 3.30. 507.2 535.1 11.15, .... - 578.2 3.40, .... - 535.6 f 535.4 ] 4.00, .... 572.4 516.1 11.30. 576.3 l 546.1 J 4.10, .... - 515.9 12.00. 570.3 4.15. 567.0 - 12.20. 545.9 - 4.30. 539.4 560.3 12.30. - 563.5 4.45, .... - 563.2 12.35. 538.8 - 5.00. - 547.4 12.50. 538.8 - 5.15, .... - 568.5 1.00. 533.1 552.1 Average, 544.9 552.7 1.30. 542.5 548.1 1 Cleaning pipe. B. T. U., Oct. 5, 1916, 30 Pounds Pressure. Time. Malden. Revere. Time. Malden. Revere. 10 . 00 , .... 526.5 532.1 1.00. 539.9 542.4 10.30. 556.0 562.4 1.30. 530.6 524.9 11.00 . 549.0 522.8 2.00. 517.0 535.9 11.30. 586.3 558.1 2.15. 558.5 - 11.45, .... 548.7 - 2.30, .... 561.0 540.1 12.00. 566.8 534.4 Average, 550.4 541.4 12.30. 562.2 560.5 11 Analyses {Per Cent, by Volume). Malden, Oct. 4, 1916. Revere, Oct. 4, 1916. Malden, Oct. 5, 1916. Revere, Oct. 5, 1916. Specific gravity,. 0.584 0.610 0.587 0.582 Ethylene,. 6.08 6.78 6.26 6.06 Benzol,. 1.69 1.60 1.08 0.87 Marsh gas,. 19.72 20.18 26.18 26.86 Hydrogen,. 38.06 36.48 35.25 35.02 Carbon monoxid, .... 22.85 22.25 15.48 15.56 Nitrogen,. 6.98 7.65 10.68 10.33 Oxygen,. 0.11 0.40 0.61 0.93 Carbon dioxid,. 4.51 4.66 4.46 4.37 Similar tests were made in February, 1917, to bring in cold weather conditions; the gas at Malden was taken off just after the compressor, so that any change in the gas would come from distribution (6 miles) and cold. For some weeks the tempera¬ ture had been below freezing and snow and ice were on the ground, which was frozen for 2§ to 4 feet, the temperature at 6 p.m. February 15 being 28° F., and at 6 a.m. February 16, the day of the test, 21°. The gas (74 per cent, water gas) in the latter part of its travel passed over a railroad bridge. The loss in Btu’s was 36.5, or 6.37 per cent. An interesting comparison is given later in the following tables of the results in averages reported by the two companies for three weeks, including that in which the tests were made: — B. T. U., Feb. 16, 1917 {74 Per Cent. Water Gas). Time. Malden. Revere. Time. Malden. Revere. 10.00, .... 571.0 - 11.30, .... 559.0 - 10.07. 570.0 - 11.35. - 523.2 10.15. 591.8 - 11.45. 552.0 527.6 10.25. 584.6 549.1 11.50, .... 561.4 - 10.30, .... 572.6 559.9 12.00. 555.1 526.6 10.45. 539.4 533.9 12.05. - 524.2 10.52. 562.0 - 12.15, .... 575.1 529.9 11.00. 619.7 514.1 12.20, .... 578.1 531.6 11.05, .... 606.3 543.0 12.25, .... 579.3 - 11.10, .... 563.0 - 12.30. 584.9 532.1 11.15, .... 558.4 568.0 12.40, .... - 535.5 11.22, .... 570.0 - Average, 572.7 536.2 11.25, .... - 543.7 12 Analyses {Per Cent, by Volume). Malden. Revere. Ethylene,'. 8.06 6.44 Benzol,. 1.31 1.17 Marsh gas,. 16.86 19.61 Hydrogen,. 37.22 35.31 Carbon monoxid,. 25.63 21.03 Nitrogen,. 6.17 10.88 Oxygen,. 0.35 0.81 Carbon dioxid,. 4.38 4.75 Average Daily B. T. U. reported by Gas Companies covering Period of Distribution Tests. Date. Works. s Malden Testing Station. Suburban (Revere) Testing Station. February 5,. 528.0 526.0 522.5 February 6,. 531.0 531.0 542.0 February 7,. 544.0 538.0 540.0 February 8,. 550.0 541.0 539.5 February 9,. 544.0 540.0 533.0 February 10,. 535.0 534.0 525.5 February 12,. 536.0 535.0 528.0 February 13,. 538.0 541.0 537.5 February 14,. 545.0 550.0 546.0 February 15,. 557.0 556.0 547.0 February 16,. 563.0 561.0 548.0 February 17,. 554.0 556.0 536.5 February 19,. 554.0 553.0 536.5 February 20,. 560.5 550.0 549.5 February 21,. 560.7 566.0 553.0 February 22,. 556.7 - 534.0 February 23,. 550.0 548.5 546.6 February 24,. 557.7 554.0 552.5 February 26,. 545.5 541.0 540.5 February 27,. 546.0 540.0 542.0 Average,. 547.8 545.3 540.0 13 T aunton-Attleboro. Taunton is a coal-gas plant, horizontals, machine-charged, making about 700,000 feet per day; of this, 75,000 cubic feet is sent to Attleboro, under an initial pressure of 20 pounds, through 1 mile of 2-inch pipe enlarging to 8 inches for 13 miles. This afforded an opportunity for testing the effect on Btu’s of high-pressure, long-distance distribution of coal gas. The Taun¬ ton tests were made at the up-town testing station, while the gas for compression was taken from the same line as it left the holder. On Nov. 2, 1916, and again on March 30, 1917, when the main had been exposed to freezing temperatures during the winter and was still at about 32° F. in places, tests were made for British thermal units; in the first case little loss was shown, the average at Taunton being 586.4 and at Attleboro 585.5 Btu’s. On the second test the Taunton Btu’s averaged 642.4 and the Attleboro 627.6, a loss of 2.30 per cent.; this is a small loss on a high heat unit content. The samples for analysis were taken by an averaging bottle. B. T. U. f Nov. 2, 1916. Time. Taunton. Attleboro. Time. Taunton. Attleboro. 10.30. 590.1 - 1.15. - 579.9 11.00, .... 586.8 585.6 1.30. 589.7 581.3 11.15, .... - 587.1 1.45, .... - 584.5 11.20. - 584.8 2.00, .... 585.5 589.4 11.30, .... 589.4 587.1 2.15. - 589.1 11.35. - 584.6 2.30. 576.3 588.3 11.45. - 587.6 2.45. - 588.5 11.50. - 586.9 3.00, .... 585.0 587.9 12.00, .... 590.7 585.1 3.15. - 585.2 12.05, .... - 583.5 3.30. 585.8 586.7 12.25. - 584.3 3.45. - 581.6 12.30, .... 583.8 586.1 4.00. 582.5 585.2 12.45. - 585.6 Average, 586.4 586.0 1.00, .... -590.7 582.3 14 Analyses (Per Cent, by Volume). Taunton. Attleboro. Ethylene,. 2.41 2.37 Benzol,. 0.56 0.79 Marsh gas,. 31.33 31.77 Hydrogen. 50.80 51.42 Carbon monoxid,. 8.47 7.71 Nitrogen,. 4.10 3.68 Oxygen, . 0.32 0.28 Carbon dioxid,. 2.01 1.98 B. T. U., March 30, 1917. Time. Taunton. Attleboro. Time. Taunton. Attleboro. 10.30. - 640.6 12.15, .... - 628.7 10.35. 650.6 - 12.30. 633.9 626.6 10.40, .... 646.0 - 12.45. - 627.0 10.45. - 634.5 1.00. 647.7 625.9 11.00, .... 643.9 629.0 1.15. - 621.7 11.15. - 626.9 1.30, .... 646.0 624.0 11.30. 635.3 625.7 1.45, .... - 620.1 11.45. - 628.6 2.00. 642.6 - 12.00, .... 635.6 627.3 Average, 642.4 627.6 Analyses {Per Cent, by Volume). Taunton. Attleboro. Ethylene,. 4.22 3.24 Benzol,. 0.27 0.79 Marsh gas,. 36.95 36.61 Hydrogen,. 45.59 47.10 Carbon monoxid,. 7.19 7.24 Nitrogen,. 3.69 3.20 Oxygen, . - - Carbon dioxid,. 2.09 1.82 15 Steaming Verticals. Vertical installations for coal-gas manufacture are of two types, intermittent and continuous; in the continuous type the coal is fed at the top, and the coke withdrawn at the bottom of retort in such manner that the carbonization proceeds con¬ tinuously. This type offers a splendid opportunity, in theory, of “improving the art of gas manufacture” by increasing the heat units per pound of coal by the introduction of steam. Ex¬ periments were carried out at the Springfield Gas Light Com¬ pany’s plant in March, 1917, with satisfactory results. Unit B, consisting of 24 retorts, Glover-West, in three benches of eight retorts each, was so arranged that the gas could be purified and kept separate from the other gases until a sample could be taken in the averaging holder. After experi¬ menting on amount of steam that could be used, the following method was decided on: 20 pounds’ pressure steam was fed through a fixed aperture, reducing the pressure to 9-9.5 pounds; this steam was passed through two lengths of pipe placed in a waste heat flue and acquired about 200° F. super¬ heat; then passing through an aperture less than two-tenths inch diameter the steam entered the retort at its lower end at the rate of 350 pounds per twenty-four hours per retort. The superheated steam passing through the red-hot coke in lower part of retort would be partially decomposed, forming blue water gas of approximately equal parts carbon monoxid and hydrogen; but analysis of the gas shows further action of the steam and water gas in preventing the cracking of the hydro¬ carbons. The hydrogen in the steamed sample should have in¬ creased by the same amount as the carbon monoxid if the action were only that of making blue water gas, but as the hydrogen remained the same, in proportion, as before steaming, while the carbon monoxid was increased (over 3 per cent.), and the illuminants increased in total amount and also in pro¬ portion, it is fair to deduce that the introduction of steam im¬ proved the quality of gas produced as well as its quantity. In addition to this another advantage appeared in the changed character of carbon in retorts; generally this is in a hard, com- 16 pact form detached with difficulty from the retort, but when steamed the carbon is more amorphous, is more easily de¬ tached by barring and burns off quicker; in fact, the tests showed 43.7 per cent, less time lost from retorts out for scurf- ing. There is also an apparent increase in the ammonia pro¬ duction of over 12 per cent. The actual tests ran tw T o weeks, after considerable prelim¬ inary work had been done. Coal of at least three varieties, suf¬ ficient for the two weeks’ test, was well mixed in the storage shed to insure a uniform supply. A 15-foot sampling holder was so arranged as to collect an average sample of the gas for the day period from 8 a.m. to 5 p.m., and for the night period from 5 p.m. to 8 a.m. The company’s chemist made tests on each day and night sample, and the State inspectors made one day and night sample test each week for a check. The first week was run without steam, the second week with steam. The results follow: — Springfield Steaming Tests. Company’s Averages for Each Week. Not steamed. Steamed. Increase (Per Cent.). Average daily make (cubic feet), 1 650,000 730,000 12.30 Average yield per pound (cubic feet), 5.49 6.72 22.40 Average Btu,. 540 519 3.89 2 Average Btu per pound,. 2,965 3,488 17.60 Average candle power, 3 . 9.5 7.0 26.30 2 Average retorts out per day, .... 1.81 1.02 43.70 2 1 One week without and one week with steaming. 2 Decrease. 3 Argand burner. 17 State Inspectors’ Results and Analyses. March 16, 1917, not steamed. March 23, 1917, steamed. Day. Night. Average Btu total,. 523.40 1 516.00 511.20 2 Average Btu net,. 475.70 468.80 463.20 Candle power,. 8.27 3 6.10 6.40 4 Yield (feet per pound),. 5.49 6.72 6.72 6 Btu per pound of coal, ..... 2,873.00 8 3,466.00 7 3,435.00 8 Analyses (Per Cent, by Volume). Ethylene,. 1.07 1.79 1.51 Benzol,. 0.97 0.84 1.06 Marsh gas,. 27.33 24.93 24.42 Hydrogen,. 57.69 56.11 56.25 Carbon monoxid,. 7.92 11.03 11.34 Nitrogen. 3.80 3.55 3.79 Oxygen,. - - - Carbon dioxid,. 1.23 . 1.75 1.63 1 Company’s average for the week, 540. 2 Company’s average for the week, 519. 3 Company’s average for the week, 9.5. 4 Company’s average for the week, 7.0. 6 19.57 per cent, increase. 8 Company’s average for the week, 2,965. 7 20.65 per cent, increase. 8 Company’s average for the week, 3,488. The results show an increased make of gas per pound of coal, an increased “ efficiency ” factor, a better quality of gas, an increased yield of ammonia, less wear and tear on the retorts and no disadvantages as yet. Oil Washing. Having in mind the object to improve the efficiency of serv¬ ice, and knowing the difficulties encountered in delivering gas uniform in quality at the consumer’s premises, the question of distribution troubles and their remedies was studied. One dif¬ ficulty is the presence in the commercial gas of naphthalene and easily condensible hydrocarbon vapors; these are affected by size of mains, speed of flow of gas, fluctuations in pressure and weather conditions, at times dropping out of the gas and 18 at other times being picked up by the gas. On a candle-power basis it is desirable to have the gas carry as much of these ele¬ ments as it will, but on a heat-unit basis they are not so desir¬ able. Naphthalene can be reduced by washing the gas with various oils; this washing process may reduce the amount of lighter vapors and olefine gases that are not so undesirable. Washing gas with oil is the usual method of recovering the benzol, toluol, etc., carried by the gas, and experiments were instituted and much study given to the effect on its heating value by so doing. Various oils may be used, the usual ones being green and creosote oils, distillates from coal tar and straw and mineral oils, “non-viscous neutrals,” distillates of petro¬ leum. Washing with these oils takes from the gas some of its constituents which are recovered from the wash oils by dis¬ tillation as “light oils.” These light oils are composed of ben¬ zol, toluol, solvent naphthas and other heavier vapors, as well as naphthalene. At present toluene (the pure toluol) is of im¬ portance as a base for the manufacture of high explosives, and, owing to the difficulty of getting apparatus for its recovery from gas, study was given to this phase of the question. The problem became one of improvising apparatus to wash gas and to recover the light oils. Gas oil as used for making water gas was used, in a Standard washer scrubber, as a washing me¬ dium; a steam-heated still was made from a boiler feed water heater, and a condenser from a section of hydraulic main put on end with piping, later supplanted by a coil of lead pipe, for condensing the vapors. The outlet from still was a 6-inch pipe, 8 feet high, filled with stones, acting as a dephlegmator. Pipe lines, pumps and storage tanks completed the equipment. As considerable apprehension was felt by the plant manager as to naphthalene being sent out, attention was given to chemical control of this element; a method for rapid analysis was de¬ vised and tested, and it was found that, with the coal gas ex¬ perimented with, the naphthalene content was reduced from between 26 to 28 grains per 100 cubic feet to between 5 to 6 grains per 100 cubic feet by washing with gas oil. An addi¬ tional advantage was found in the reduction of total sulphur in the gas; before the washing the amount was 28.4 grains per 100 cubic feet, and after washing, 19.5 per 100 cubic feet. 19 The oil used assayed per cent, off at 200° C.; 28| per cent, off at 250° C.; 62 per cent, off at 300° C.; 88§ per cent, off at 350° C.; 11| per cent, as residue. A test was carried out, washing 1,000,000* cubic feet of gas with 1,556 gallons of oil in twelve hours, obtaining 74 gallons light oils, equivalent to 4.76 per cent, of the wash oil used; these light oils distilled off from the benzolized oil gave 34 per cent, to 100° C.; 22 per cent, to 120° C.; 7 per cent, to 135° C. On fractionating with a column still head there was found 29.5 per cent, benzene, 12.8 per cent, toluene and 5.8 per cent, solvent naphthas. The effect on the gas is shown in the following table. The retorts were charged every two hours, 24 at each charging, re¬ quiring forty minutes. The oil was pumped into washer scrub¬ ber beginning at 9 o’clock and occupying nearly an hour. The tests were made on gas from an averaging holder which showed a lag of thirty minutes before showing the effects of any change in the gas. Therefore the first test would be of gas before the effects of charging and washing were felt. Time. B. T. U. Candle Power. 9.15 A.M.,. 597.8 13.75 9.45 a.m.,. 599.2 13.66 10.15 A.M.,. 604.7 14.23 10.45 a.m.,. 595.8 14.18 11.15 A.M. 587.7 14.01 11.45 A.M.,. 581.2 13.03 12.15 p.m.,. 584.5 12.33 1.00 P.M.,. 587.1 12.04 1.30 p.m.,. 584.9 12.13 2.00 p.m.,. 578.4 12.55 2.30 p.m.,. 598.8 13.05 3.15 p.m.,. 602.3 13.47 Average,. 591.8 13.20 20 Conclusions. In the report of the gas inspector for the year 1895 1 appear the first calorific determinations of Massachusetts gases. Con¬ siderable work has been done since by various committees, gas associations and the Bureau of Standards in perfecting appa¬ ratus and refining methods, until to-day calorific value is gen¬ erally recognized as the most scientific method of valuing gas. In 1915 a series of tests was made 2 covering the typical gases supplied by the Massachusetts companies, — coal gas, water gas and mixed coal and water gases. If the average candle power found in these tests be calculated to 16, the minimum required by the statutes, and the average calorific value be re¬ duced proportionately, there would be developed a “ translation value” of 560.9 Btu’s.; that is, if all the gases tested had been exactly 16 candle power the equivalent in calorific value would have been 560.9 Btu’s. It does not follow, however, that if gas should be made to a calorific value of 560.9 Btu’s, the candle power would be 16. This investigation was undertaken, in part, precisely for such information, and the averages for the several periods show the results obtained. Averages, Weekly Reports. Period of Time. B. T. U. Candle Power. July 1, 1916, to Jan. 1, 1917, Jan. 1, 1917, to Apr. 1, 1917, Apr. 1, 1917, to July 1, 1917, July 1, 1917, to Oct. 1, 1917, July 1, 1916, to Oct. 1, 1917, 559.7 558.7 557.9 556.7 558.5 15.29 12.64 14.50 14.63 14.83 Even under the stress of abnormal times the calorific value has remained exceedingly constant, while the candle power has followed the usual fluctuation experienced in changing weather. Uniformity of calorific value is to be desired, for the larger proportion of gas is used as a source of heat, and a uniform quality of gas is the first element of good service to the con- 1 Public Document No. 55, January, 1896. 2 Thirty-first annual report, Board of Gas and Electric Light Commissioners. 21 sumer. If, in order to retain a uniform candle power, the cal¬ orific value varies, the actual service rendered the majority of consumers will be impaired. Good service consists of uniform quality of gas supplied under uniform pressure through efficient appliances kept prop¬ erly adjusted. The gas should be of such quality that the con¬ sumer gets the greatest amount of useful, available heat at the least cost. This means that the diluents, or inert gases, should be kept as low as commercially practicable, and that the gas should be so made as to insure the delivery to all consumers, under all conditions of distance and weather, of the largest pos¬ sible amount of the heat units produced in the manufacture of the gas. Experiments already described show the loss of calorific value from high pressure and long-distance distribution to be from 2.3 to 6.5 per cent. Adding steam to vertical retorts increases the “efficiency factor” 20.1 per cent., as well as being advan¬ tageous in other respects. Tests show that open burners do not develop the full lighting value of gas as determined by the of¬ ficial burner; the loss is from 7.3 per cent, for coal gas to 52.5 per cent, for water gas. Open burners vary widely in efficiency among themselves, the tests ranging from 28.6 to 69.3 per cent, of the true lighting value of the gas. The oil-washing experi¬ ments show the possibility of separating benzol, toluol, etc., from gas by washing with oil in improvised apparatus. While oil-washing “hardens” the gas and tends to increase uniformity of quality by removing condensible hydrocarbon vapors, naph¬ thalene and sulphur, it reduces also the calorific value somewhat. As toluol is a base for the manufacture of high explosives, and is needed by the government for such use, and as benzol may also be so needed, it is worth noting that the removal of these elements would reduce the calorific value by 6 to 7 per cent. only. But as the urgent need of the Federal government for toluol necessitates the recovery of this element from gas, the minimum calorific value required of the gas companies should be set at such a figure as to make this recovery feasible. Con¬ sidering the results of this investigation, the uncertainty of a supply of suitable coal and oil for gas manufacture, and the need of the Federal government for toluol, and possibly, later, 22 benzol, it would seem desirable for the Board to establish a minimum calorific standard of not over 525 total British ther¬ mal units, and to recognize the possibility that this figure may need revision in the early future. The appendices consist of the following: — A. List of companies participating and their plant equipment. B. Diagram of calorimeter tank installation. C. Form used for weekly report by the gas companies. D. Form for recording observations and calculating results of calorific determinations. E. Tables for calculation. F. Efficiency factors for coal and oil. G. I. Detailed reports Btu and candle power by the companies to Oct. 1, 1917. II. State inspections and comparisons. III. Curves Btu for year ending June 30, 1917. H. Burner tests, Tables A to I. Respectfully submitted, CHAS. D. JENKINS, Inspector . Nov. 12, 1917. 23 Appendix A. List of Companies participating, and their Plant Equipment. Company. Equipment. Attleboro (No. 15), Coal gas (buying 25-30% from Taunton). Seven benches of 8’s; four 10' x 15" x 30" and three 9' x 14" x 26". Capacity 0.3 million. Daily tests at testing station; no calorimeter at works. Boston (No. 1), Mixture coke oven and water gases in about equal parts. Tests made at Everett on water gas three times daily. Three tests daily at testing station at the Central Station, Roxbury. Brockton (No. 2), Coal gas with 40-60% water gas. Four stacks of 4’s Woodall- Duckham verticals wiih a capacity of 0.9 million per 24 hours. One 9' and one 7' 6" U. G. I. water gas sets, capacity 2.0 millions. Three tests daily of coal, water and mixed gases; one test daily at testing station. Cambridge (No. 3), Coal gas with 25-35% water gas. Twenty benches of 8’s hori¬ zontals, 20' x 16" x 20", capacity 3.5 millions. Two 8' 6" sets U. G. I. and one 8' 6" set Western Gas Construction Company, water gas, capacity 3.5 millions. Tests made at works four times daily from sampling tanks of coal and water gases; two tests street gas. One test daily at testing station. Charlestown (No. 4), . Coal gas. Nine benches of 8’s horizontals, 20' x 15" x 26". One test daily testing station; no calori r eter at works. East Boston (No. 19), . Coal gas with 40-50% water gas. Tests made once daily at office; no calorimeter at works. Fall River (No. 5), Coal gas with about 50% water gas. Seven stacks of 9’s U. G. I. verticals, capacity 1.05 millions. Four sets 8' 6" water gas, capacity 4.0 millions. Tests on coal gas from averaging (24 hours) holder, 1 Btu and candle power every 2 hours; water gas, snap test Btu and candle power every hour. Commercial gas, one test daily at works and testing station. Fitchburg (No. 6), Coal gas with about 50% water gas. Two banks of 8’s Glover- West verticals, capacity 0.4 millions. One 6' U. G. T. and one 6' 6" Lowe gas machine for water gas, capacity 0.9 million. Tests on coal gas twice daily from sampling holder; three times on water gas. Commercial gas twice daily leaving holder, and once at testing station. Haverhill (No. 7), Straight water gas. Two 8' 6" U. G. I. sets, capacity 2.0 millions. Tests made three times daily on main to holders, and once at testing station. Holyoke (No. 8), . Coal gas with 20-25% water gas. Six stacks of 4’s Woodall- Duckham, capacity 0.75 million. One 7' 4" set Humphreys & Glasgow and 7' 6" set U. G. I. water gas, capacity 1.25 millions. Daily tests on 24 hours averaging holder sample, and two, morning and afternoon, on coal gas; two tests on water gas. One test at testing station. Lowell (No. 9), Coal gas with about 70% water gas. Ten benches of 12*s hori¬ zontals 14' long, capacity 1.6 millions. One 8' 6" and one 9' Lowe water gas sets, capacity 3.2 millions. Tests once daily, coal, water and commercial gases, the first two from averaging tanks. Once daily testing station. Lynn (No. 16), Coal gas with 40-50% water gas. Ten benches of 9’s inclined silica 18' x 15" x 26", capacity 1.8 millions. Two 8' 6" U. G. I water gas sets, capacity 4.2 millions. Tests on each gas once daily, and once on commercial gas at testing station. 24 List of Companies participating, and their Plant Equipment — Concluded. Company. Equipment. Malden (No. 10), . Coal gas with 50-60% water gas. Five stacks of 9’s inclined, capacity 1.0 million. One 11', one 9' and one 7' 6" water gas sets, capacity 5.0 millions. Tests on coal gas, from sampling tank, twice daily; water gas three times daily. Two tests daily on commercial gas leaving holder, and one at testing station. New Bedford (No. 11), Coal gas with 38% water gas. Six benches of 6’s inclined, 20' x 26" x 16", capacity 0.57 million. Water gas, two 9' U. G. I. and one 7' 6" Western Gas Construction Company, capacity 3.15 millions. Averaging tanks used for both coal and water gas; one test of each gas daily, with a Parr calorimeter. One test of commercial gas at testing station. Old Colony (No. 12), . Straight water gas distributed entirely under high pressure (8-30 pounds). One 7' and one 6' U. G. I. sets. Daily tests at test¬ ing station. Springfield (No. 13), . Coal gas with 50-60% water gas. Five sets of 9’s inclined and six sets of 8’s Glover-West verticals, capacity 2.5 millions. Two 9' and one 10' U. G. I. water gas sets, capacity 4.0 millions. Tests on mixed coal gases from averaging holder made twice daily; water gas, three tests; commercial gas, twice daily on leaving holders, and once at testing station. Suburban (No. 17), High-pressure gas from Malden, 6 miles under 5-38 pounds’ pres¬ sure. Tests daily on commercial gas. Taunton (No. 18), Coal gas with 10-15% water gas when needed. Six benches 20' x 16" x 26" horizontals, capacity 0.9 million. One 7' water gas set, 0.6 million capacity. Daily tests at testing station. Worcester (No. 14), 0 Coal gas with 40-50% water gas. Two sets of ten banks of 8’s and one set eight banks of 16’s horizontals, capacity 3.8 millions. One 8' 6" and two 8' water gas sets, capacity 3.0 millions. Tests once daily on coal gas from 40-gallon continuous sampling tank. Water gas once a day from relief holder. Commercial gas once a day at works and at testing station. Appendix 25 ? ar\ 5a f 26 Appendix C. &.y tamtammliii .of fS&csarljoflttla CALORIFIC INVESTIGATION, WEEKLY REPORT BOAED OF GAS AKO ELECTBIC LIGHT COMKISSIOKEDS A.M. Company _ Six day period ending _ P.M. _ 1917. COAL GAS WATER GAS Gas made* per pound of coal Gas made* 1 Kinds of coal used Percentage of each Generator coal lbs. per M gas Generator coke lbs. per M gas Total fuel lbs. per M gas • Analysis each cargo above coals Date a Oil, gals, per M cu. ft. gas* Moisture Ash Volatile Sulphur No. hours run, each machine Fixed carbon Kind of enricher used B. T. U. Tar, gals, per M cu. ft. gas Amount per hundred lbs. of coal Kind of oil Analysis of oil Lbs. coke per 100 lbs. coal Date Gab. tar per 100 lbs. coal Spec, gravity Lbs. NH j per 100 lbs. coal Distillation up to 100* C 200 — 250 100 — 150 250 — 300 150 — 200 300 — 350 B. T. U. gas, average B. T. U. gas, per lb. coal B. T. U. gas, average B. T. U. gas, per gal. oil Candle-power burner Specific gravity Candle-power Specific gravity burner Analysis gas Date Analysis, or, if not complete, CO, Blum. Date CH« N, Blum. H, 0, - CH« N, CO CO, H, 0, CO CO, COMMERCIAL GAS Amount gas made* total 1 coal water % watefj B. T. U. at works,* average max. date min, date B. T. U. testing station, average B. T. U. State inspection * max. date date min. date Candle-power, average at station, burner used Gas analysis 4 State inspection* Total sulphur per 100 cu. ft. Date average Blum. N, max. and date CH« 0, min. and date H, CO, CO Spec, gravity Remarks: Signed •All gas returns to be corrected to 30" bar. aud 60* F., purified and metered i Thousands and tenths; Sunday make excluded ■Adhere to schedule; U changed, note In remarks apace ■Do not fill In ‘Average, U more tl 27 Appendix D. JtfrmG. 1.19. 10.000. 8-’17. fElje Commontoealtf) of fflasistattjusiettss BOARD OF GAS AND ELECTRIC LIGHT COMMISSIONERS DAILY CALORIFIC TESTS Place a.m. Date Time p . m . Kind of Gas No. of Calorimeter Maker Temp, of Room F. Humidity % Wet Bulb Dry Bulb Water Valve Exhaust Valve Rate per Hour Temp, of Meter Meter Outlet Pressure Equivalent in Mercury Barometer Total Pressure Water Temperature In Out In Out In Out Temp, of Exhaust Condensation; Water c.c. Meter start “ end B. T. U. from Cond. GAS 1 Meter start " end 2 Meter start “ end 3 Meter start “ end Av. Temp, observed Ther. and Stem. Corr. Corrected Temp. Rise in Temp. Weight of Water Observed. B. T. U. Humidity Correction Heat Loss Total B. T. U. Average B. T. U. Net B. T. U. Remarks: 28 Appendix E. Tables for Calorimetric Corrections. Table A. — Stem Correction for Outlet-Water Thermometer. Temperature Rise Room Temperature. of Water. 50° 60° 70° 80° 90° 100° imersed S o £5 o +0.01 .03 .04 +0.02 .04 .05 +0.03 .05 .07 +0.03 .06 .09 +0.04 .08 .11 +0.05 .09 .12 meter in to Ol 1.0 —A >-* OOlO +0.01 .02 .02 +0.01 .03 .04 +0.02 .04 .00 +0.03 .05 .07 +0.04 .07 .09 +0.05 .03 .11 1 r io, 60° U5, e i 20 * • • • +0.00 .00 .00 +0.01 .01 .02 +0.02 .03 .04 +0.02 .04 .05 +0.03 .05 .07 +0.04 .06 .09 Table B. — Conversion Inches Water into Inches Mercury. Inches Water. Inches Mercury. Inches Water. Inches Mercury. Inches Water. Inches Mercury. Inches Water. Inches Mercury. 1.0 0.07 2.4 0.18 3.8 0.28 5.2 0.39 1.2 0.09 2.6 0.19 4.0 0.30 5.4 0.40 1.4 0.10 2.8 0.21 4.2 0.31 5.6 0.41 1.6 0.12 3.0 0.22 4.4 0.33 5.8 0.43 1.8 0.13 3.2 0.24 4.6 0.34 6.0 0.44 2.0 0.15 3.4 0.25 4.8 0.36 0.1 0.0074 2.2 0.16 3.6 0.27 5.0 0.37 Total pressure, inches. Temperature, Fahrenheit. Table C. — Logarithmic Factors, being Co-Logarithms io reduce to Standard Conditions 0.2 Cubic Foot Gas. SS‘ S6‘ S7‘ 7240/250/262 7224/2)4 \ ?246 72087218 72)0 7J9] 7177 720172M 7187 7198 727272847296 72867268728 / 7240 72S2726J?', 7228727772437c 7209722/7234 7161 7/7/ 7/82 7/46 7/86 7168 7/7/714/ 7/83 7//S 7/oo 290 7/90/202 7/63 7/?S ?/87\7: 7/28 7/37 71417199/172 7 7 32 7/447/S6 7> 7110 .17069 7088/098 7/07 \J079709I 7084 70647078 70J9 7049 7024 7034 7046 7H7 7±°L 7086 \gii 70S6 300 6. 93S 6946 C9S7 6 6920693/ 6942 . 690869/6 692 3 689/ 6902 69/3 .5 m268?9,6884 .6 68/76888666. '6633 68 /4 6888% 66/9 6830684, .9 680/68/8 6826 58’ S9\6>0‘ 6>1 62 63' (>4‘ (,S* U* i? 68' 6? 730873/7/329 7339 7290730/ /3/3 732/ 274/286/29£\730£ /)2/ 7382/7364 7)75/387/400/4/2 7424 7436 7448 746/ /336/348/389 737/ 7384 7396 7m 7420/4 4 7386 73/6 7380 7393 7404 259 7271/282 7243/256 7/94 7208/2/8/2 7/19 5 70097020 703/ 2 69941005 70/6/026/038/0 5/ .7 69/9,6 990 700/ 70// 702) £ 6964,6975 6986 6996 70 08702//c .960596/ 6972 6982 699 7305 73/7/328/240/353 ’M '/286/297/3 06/ 32/ WMMWK 7 306/ 7254 14 72/5/228 W9 7250\ /99/232/224 7235 72657277 72907302 f&M 7/297/4/ 7i 7//317/26 / 7096/HO 7, 7083/098 7068/060 7 < 7256/26872 336/147/158/169 //83 //93/204/2/6 /228/240 7252 7225] 35/ 7/63/Z73 7/84 7/97 7208 7279 723/ 72 369 77' 7/537/66 720. 7/89 720/ 72 7 7/387/50 7/237/35 7/62 7 7/47 098 // 9676979\ 695269645977 7\693769 49 \ 6962 r 7087/i 17072\ l 7057/( 7 7042/053 - 7027 7038 322 7/43 7/85 3777/287/J07/ ’068/079/09/7/02 7H3 7/25 106 7/20 7> ’083/094?/057< 7076 7i 700/ 6986 697/ 6956 'O87 7098///0 ^' , ' U 083/095\/l 7/2) 7> 08 69236 93 55947 __ 4/8766887 6898 6908 69206991 69421954 6965 7013/014 7034 7045 7057/068/0 80/ -'->054/066 ?i 5391705/?l 002/0/3/0247036 CjU 70/9 703/ 7004 70/7 68946906 69/8 9 6880,689/ 6904 6. '86566776889/ / 685/686)687. 7 <8376848666, 6927 6m 6\ 9/3 6924’ 89869/0 ’868846295 '989 71 69756987 704) 70 7028 70 7 7064 7°J1 696/5973 6946/958 6)2/944 7 / 9/7 69 JO g 69846: m /95s 6907X69/76990 6940^959/696]^, > 1 6876/688/ 689) 6903/915 6926 692/6\ ’ 995 / 00 , 6 980599 2 696559/6^. 69J6 696/ '949 696/ 70 ’ 7 r 72 * 73 ' 7445 73657377738m 736/ 7372 1)85 W ’398 ’382 71 6A?J 734573567369/ 3/8 7)30 734/7353 73/4 7)25 ?3)8 '298 73/0 7322/335/ 7295 7)06 7)/9 7)61 735/ 723/72 1729/ 1 7276 ? 7260/27. 7)04/3/7 7329 7)42 7)55 736/ 738/ ?394 7289/302 7)14 7)27 7)40 7)52 7365 73/8 7\ V7J /185 /198/2107 1 22^/233/245 7/58 7/70 72/0/ c 7/82/1947206/218/2)0 7/9/ 72 7/79 7/64/ 176 72/47, 7199721, 1)42/46 7/20JLLL \202 7/88 7/6/ 7/72 7/847/9, 7/58 714) ft 7/69 7/55 ?/04 ?//( 70907/0/. 70/57 9 7060 '087 70 TOIL 94 70% 7 708/ 709) '/\7034\70457057 B 030 7042 7054 /06A7078/092\7/0 4 /n 6 7/29 0/ 6/028/040 7057/06179217089 7L '002/0/3 /0251/1 w &F3 791170, '008 74 * 75 ° 76* 17 * is* 79 * 80* 82’ 83* 84‘ 85‘ 86* 87' 89’ 9J‘\92’ 93' 94’\95’\%’ 74867499 7470 7483 7497/S09 752} 7536/54$ 7564/378 7c '629/442/4547467 748/ 7493 7< 75/3 7525/5)$ 7552/565/58/ 7594 760) 7622/6)7\76S2 7666 76807697/7/22 7636 7650 7664 768/7695/ 74)9745/ 742374)5\ m 174 7465/. 7449 7J)4\/4 4772 75)9 752} 7507/520/53) 7 548/5 62/ 49175037. ’4/5 2489 7502/5/6 14762076)476 5/8\7 5)2\}546/460\75?4/58^/60)/6/7/6)2/649 }(63 7679/ ------ j 747)2 ’486 7500/0 74/0/484 74 * 7408/420/434/446/459 7)92 /404 74IS 74)0 744 3/458 7)64/3777)88 7402 74/4 74237442/ 455/ 469 7)61/3737)87/399/4/2 7426 7439 ?45J '74/07424 7437 74 2f58/57l 760/ >348 7)32 \7)457)57/37/ 75427446 7571/48) '2/4 267540755 7526 S75/2 1/496/5/0 7524 748/\7495/509 7465 24697 W4 mm 75)8 7. 7600/ ’48' 7466/ ’542 47600 7646 7 ( >63071 7 2LL '6/6 76)/ ?6/57i ’58475)9 76/4/629/6447661/678 .7 758) . 75377, 7568 442 749/ 7507 742/ 74)7 ?442 '22/4)5/449 746) 7420 74)41448 74i 7406 74/874)2 7446/4607476/490/405/. >393 7403/4/6 74) 0 7444/460 7, f )/2S6/268\728l/294/)06/)/9\7)))\7J45\7)60/)74 7)S7\?40) 74/5742974447458/474/ '3/286/ >221 12587, >29.8 73/2 728) 7296/309/32/ 7408 >392/406 7)25/347 7350/363/376/)90 '8 736// )747. 7 *T '49//50S/52J 75)6745/ 7566 /482/597/6/4 >420 ? r)A 7504 75/9 743 4/54/7466 758) '489/403 75/9 75)5/450 ?567 4 37250 7263 72 1)031 718. >240 7253/266/279/29) \7304\73/7\?JJO 2/224?, 7/2/0 '27/957, '181 V/93/20572/8 7344 7)58 7372,7)86/4 7289 1/2)57248/260 7273/2877, 17220723)72-^-^-"-"-' '3/573 300/3/ 4/) ’285 '57258/272 7 '^24372561270 ' 7/40 7/24\7/37//41 /l63 / 7110 7/22 7/ 36 7/46 r 7/42 ?/66 ?/78//907203 72/6 7228/242 7/88 120172/47227/ 7/73 7/ 06 7/96 72/2 7214 7281 ’\725 4/268 7282 7294/309 7)2) 7)37 7342 7365 ?)8, '2407243 ' " '/09/(22 \?/34 7/467/53 7/327/44 7/ '225 7/84/19? 77/0 /224 7/8/ > 1/66 '037/04 >022 ' 9/063/ ’048 '0/0)3/ 7034 ]L 702i~ '074, 7060, '045 ' 7H2 7/24 7085 709873 7/4/ 7/2Z W ?) 1) 7)477)70& 734/7354; >4/4 14/399 74 7)83 7)98/4 /2 >97442 74 742774 7298 73/2 7)26 73 407)54 7)68 738) 7)96 74 73 // 7)43 r ’308 7322 7)37 7)40 7)66 738/ 7396 ?. >29) 7307 7)22 7))4 7)4/ 7)65 7)8/ £ 7232/350/264/278 7292 7M7)20 7))6/)50 7)66 7 , '2 72)6 7249726) 72?S 7292 7)05 7)2/ 73)4 7)40 726772807294 /. 733172427264/2797, 7)941202 Tin 72347248 7311 7372 7290 7M 7371 7/8d\7/9J\720672/9 7233. 72487262 ?, 7/64 7/78 7192 7205 7, 0 7/63 7177/190, 7/4/ 1973337 72/ 720 ' '241 973)3/3 7726/7. 724) 7287\ mi ?43 ??S9\?175 7 72?/74n7S97, mwi/ir 2bC 1 7760 2 ’26 7744 ,? 66/76767624? '645766/ 7677 7695] 6 7599 76/3 7 62976441662 1646 1467 7 . '48/ 749876/) 76)0 290 >/-// ->roi iro-> ->/ii / 75)5 7440756 77482 ?498 .2 1488 7403 741974)5 7* '45/ 7447 7472 74877 50474/9 75)6 6 9/443 7447 7472 7488/40) 7420 .7 7426 7442 7447747)7481 ?SC4__.8 >4U 7426 744/ 7447747) 7489 ,9 1/426 74422441 7474\)0 0 ‘ 4n 74277441 ? >3 9574/2 7 427 7‘ >380 7396 74 n 7c >)64 7)81 7396 74 7458 . / '7/44) mm 74/3 .4 7)34 7)40 7)667)8/ 7)98 7) 06X7)2! 73)5/351/36 6 7)8) .6 S /06 7)2 / 7) 36735' ~ 7)06732n)JL; 1295/30^)2/ l 3 7J5JX 8 Log. observed Btu = W + T + F. W = Log. Wt. of water. T = Log. Rise in temperature. F =» Above factor. 29 Table D. — Percentage of Humidity (Rapid Ventilation). Dry bulb reading. Degrees Fahrenheit. 60 62 64 66 68 70 72 74 76 78 80 82 84 8b 88 90 88 94 86 94 86 84 93 85 78 CD PO 93 85 78 71 80 93 83 77 70 64 78 93 84 76 70 64 58 76 92 83 76 69 63 57 S3 74 92 ,83 76 68 63 56 52 46 72 92 83 75 68 63 55 50 46 42 70 92 82 74 67 62 54 49 44 40 36 68 90 82 73 66 60 54 47 44 38 35 31 66 90 82 73 65 58 53 47 43 37 33 29 26 64 90 80 72 64 57 52 46 42 36 33 27 25 23 62 90 80 72 63 57 50 44 39 35 ' 30 27 24 21 17 60 89 79 70 62 55 48 43 37 33 28 25 23 18 16 13 58 89 79 70 62 54 47 42 36 32 27 24 20 16 15 12 9 56 79 69 6! 53 45 40 35 30 25 25 18 15 14 10 54 69 60 52 45 38 33 27 24 20 16 13 10 52 58 49 43 37 31 25 22 17 14 It 50 49 41 35 30 23 20 15 12 Table E. — Corrections for Humidity in B. T. U. Percentage of humidity. 10% 20* 30 40 50 60 70 80 90 60° + 4 +4 + 3 +2 + 2 + 1 + 1 0 0 65 + 5 + 4 +4 + 3 + 2 + 2 +1 0 -I 70 + 6 + 5 +4 +3 +3 + 2 +1 0 -1 75 ♦ 7 + 6 + 5 +4 +3 +2 + 1 0 - 1 80 + 8 + 7 + 6 + 5 + 3 + 2 + 1 0 - 1 85 + 10 + 9 + 7 + 6 +4 + 3 + 2 0 - 1 90 + 12 + 10 '‘+9 + 7 + 5 +4 + 2 0 -2 Humidity. 30 Appendix F. Efficiency Factors for Coal and Oil, July, 1916, to October, 1917. Company. B. T. U. Feet. Oil Factor. Boston. - 109 Brockton, . 3,289 112 Cambridge,. 3,176 105 Charlestown,. 3,209 - Fall River. 3,146 109 Fitchburg,. 3,064 106 Haverhill,. - 110 Holyoke,. 2,826 111 Lowell,. 3,201 100 Lynn. 2,962 107 Malden,. 2,666 106 New Bedford,. 3,002 105 Old Colony,. - 109 Springfield,. 2,913 101 Taunton,. 2,980 - Worcester,. 2,882 104 31 Appendix G. I. Tabulation of weekly reports and averages made by gas companies, showing averages by weeks of quality of commercial gas at testing stations and of the constituent gases at works stations; for the period from July 1, 1916, to October 1, 1917. II. Inspection results by State inspectors and company av¬ erages reported for week during which the official-test was made for the same period. III. Curves Btu's for year ending June 30, 1917. Tabulation of Weekly Reports and Averages. Attleboro. The only results reported are of Btu for commercial gas, as follows: — Commercial Commercial Commercial Commercial Commercial Commercial Commercial B. T. U. B. T. U. B. T. U. B. T. U. B. T. U. B. T. U. B. T. U. 624 611 611 610 609 634 608 622 610 606 609 611 622 598 605 608 604 623 625 633 614 611 611 607 618 617 603 607 613 613 608 630 618 598 618 613 597 622 614 602 607 626 602 617 636 594 603 632 621 626 620 Boston. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. HjO. B.T.U. Candle Power. 640 17.1 - - 2.92 538 106 16.2 50.8 595 16.7 638 17.3 - - 3.02 535 102 15.9 50.0 586 16.3 645 17.2 - - 3.01 538 102 15.9 51.9 585 16.3 636 17.2 - - 2.77 521 104 14.8 52.3 582 16.3 32 Boston — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. HzO. B.T.U. Candle Power. 623 17.3 - - 2.75 517 101 15.5 56.3 564 16.3 625 17.2 - - 2.66 518 106 15.8 57.4 563 16.2 617 17.4 - - 2.66 512 104 15.5 64.6 568 16.2 616 17.1 - - 2.69 519 105 15.4 59.4 5G4 16.1 620 17.1 - - 2.65 513 108 15.5 59.6 576 16.1 655 17.1 - - 2.68 516 105 .15.4 58.2 587 16.1 625 17.1 - - 2.57 526 109 15.4 59.0 576 16.0 620 17.0 - - 2.82 540 109 15.4 59.8 581 15.9 630 17.0 - 2.89 534 105 15.9 59.9 583 16.1 629 17.1 - - 2.92 545 108 16.1 60.2 584 16.4 616 16.9 - - 2.92 546 108 16.7 60.8 589 16.6 641 16.9 - - 3.07 548 105 16.5 60.5 589 16.4 657 17.3 - - 2.94 552 109 17.0 59.6 595 17.0 648 17.1 - - 2.82 538 108 17.0 59.1 587 17.0 630 17.2 - - 2.80 536 108 16.7 62.6 573 16.9 613 16.9 - - 3.25 565 106 17.0 61.5 585 16.9 601 17.1 - - 3.09 557 107 17.4 57.0 593 17.0 612 17.2 - - 2.67 533 113 17.1 58.0 579 17.0 613 17.1 - - 2.80 544 111 17.0 59.8 572 17.0 627 17.2 - - 2.74 537 111 16.9 59.4 581 17.0 624 17.1 - - 2.77 537 111 16.9 59.4 579 17.0 628 17.0 - - 2.84 537 107 16.9 60.0 573 16.9 611 16.9 - - 3.13 559 107 17.2 62.6 578 17.0 624 17.1 - - 2.96 543 106 17.1 61.2 574 16.9 634 17.1 - - 2.83 543 110 17.1 58.9 577 17.1 632 17.2 - - 2.81 537 108 16.5 59.6 572 16.8 627 17.1 - - 2.86 540 108 16.5 58.4 573 16.7 634 17.3 - - 2.67 526 109 16.2 55.5 578 16.8 638 16.9 - - 2.77 5^3 108 16.1 60.3 568 16.4 630 17.3 - - 2.82 537 108 16.7 59.2 580 17.0 628 16.6 - - 2.48 527 115 15.4 58.3 579 16.0 638 17.1 - - 2.57 530 114 15.4 56.5 586 16.2 655 17.2 - - 2.65 535 113 15.7 56.5 580 16.4 654 17.0 - - 2.69 535 112 16.0 56.4 589 16.4 637 16.8 - - 2.57 543 119 16.4 58.0 587 16.8 33 Boston — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 630 17.1 - - 2.58 534 115 16.2 56.9 582 16.7 643 17.1 - - 2.54 542 119 16.1 60.2 579 16.7 652 17.1 - - 2.74 539 111 15.8 58.3 584 16.5 629 16.6 - - 2.55 531 116 15.5 58.8 579 16.1 636 16.6 - - 2.58 538 116 15.5 59.5 591 15.9 652 16.1 - - 2.67 544 115 15.6 57.8 589 15.7 643 17.0 - - 2.59 543 118 16.2 57.4 595 16.5 657 17.0 - - 2.66 550 118 16.1 58.9 593 16.6 655 17.2 - - 2.62 537 116 15.8 54.2 595 16.6 641 17.1 - - 2.62 529 112 15.6 54.3 583 16.3 654 17.0 - - 2.62 529 112 15.4 52.3 590 15.7 635 15.9 - - 2.61 535 114 14.9 53.4 584 15.2 623 15.3 - - 2.62 539 115 14.5 44.9 589 14.8 605 15.2 - - 2.60 532 113 14.9 53.5 569 14.7 609 15.1 - - 2.65 537 114 15.2 55.6 569 14.8 620 15.2 - - 2.83 555 114 16.2 53.8 586 15.5 606 15.0 - - 2.69 548 116 15.8 54.9 576 15.2 608 14.1 - - 2.69 520 110 15.3 56.1 567 14.7 601 13.8 - - 2 66 529 110 14.7 59.5 558 13.9 594 13.6 - - 2.74 540 111 15.1 56.5 564 14.1 582 13.4 - - 2.72 548 115 15.2 57.5 561 13.8 629 16.6 - - 2.75 537 109 16.0 57.5 580 16.2 Brockton. - 15.0 5.60 - 2.94 - - 17.6 55.0 567 15.1 * 15 4 5.41 - 3 00 - - 18.0 54.0 567 - 574 15.6 5.35 3,071 3.14 566 103 18.6 55.0 574 14.8 571 15.2 5.87 3,352 3.00 584 119 19.0 59.0 565 16 0 581 13.7 5.98 3,474 2.83 558 115 17.2 54.0 558 15.9 568 14 5 5.83 3,311 2.89 555 111 17.0 50.2 554 15.9 570 14.9 5 99 3,414 2.94 568 115 17.4 50.0 553 16.0 573 14.2 6.08 3,484 2.66 570 102 16.7 45.0 561 15.8 581 15.5 5.54 3,219 2.76 553 116 16.1 47.5 555 16.0 582 13.7 5.76 3,352 2.84 560 116 16.6 44.7 555 15.6 34 Brockton — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. 1 Candle Power. 598 14.5 5.89 3,522 2.65 556 121 17.4 48.1 553 15.0 575 13.2 5.94 3,416 2.66 557 121 15.7 48.3 549 14.3 5S9 14.1 5.83 3,434 2.90 564 115 17.1 48.2 554 14.2 592 13.9 6.06 3,588 2.93 560 112 16.7 51.6 559 13.5 595 14.5 5.82 3,463 2.86 552 112 17.0 51.4 563 14.1 587 13.3 5.S5 3,434 2.93 549 109 16.2 49.0 559 13.3 591 14.6 5.74 3,392 2.90 597 127 16.6 55.3 553 13.5 604 14.5 5.65 3,413 2.99 551 108 16.6 52.0 555 13.7 601 14.6 5.59 3,360 3.01 571 118 18.0 53.4 555 13.7 589 14.1 5.90 3,475 2.66 567 124 17.1 57.4 551 13.5 596 14.5 5.57 3,320 2.86 00 111 17.2 50.8 549 13.0 586 14.2 5.86 3,434 2.91 550 110 17.8 50.0 542 12.7 586 14.4 5.78 3,387 2.98 556 110 17.9 50.8 553 13.1 578 12.8 5.84 3,376 2.99 558 110 19.0 51.1 552 13.5 581 14.1 5.88 3,416 2.97 573 116 18.2 48.2 553 13.1 572 12.9 5.98 3,421 2.81 548 112 18.0 47.0 553 13.4 569 13.2 5.86 3,330 2.81 551 113 17.6 45.5 548 13.2 552 14.9 5.43 2,997 3 14 557 106 20.2 41.9 546 13.5 564 14.2 5.44 3,068 3.12 559 107 19.2 45.0 566 13.3 562 14.1 5.48 3,080 3.25 573 108 19.2 41.3 566 13.5 576 14.5 5.57 3,208 3.22 558 104 19.3 40.8 565 13.9 584 14.4 5.81 3,393 2.76 550 115 16.8 40.6 559 13.3 579 14.4 5.78 3,347 2.91 552 111 17.4 43.1 554 13.6 574 14.2 5.83 3,346 2.92 532 104 17.3 43.1 552 13.4 573 14.1 5.70 3,266 2.94 553 110 18.0 44.2 556 12.8 580 14.2 5.75 3,335 2.82 534 107 17.6 40.6 556 13.6 589 14.5 5.74 3,381 2.89 560 114 17.6 42.0 558 13.0 578 12.7 5.79 3,347 2.75 546 114 16.3 42.8 551 12.9 578 13.0 5.89 3,404 2.98 552 108 15.0 44.5 553 13.2 575 14.0 5.79 3,329 3.00 558 110 18.1 45.7 549 13.6 574 13.1 5.69 3,266 3.37 581 108 20.4 58.8 561 13.6 610 13.0 5.72 3,489 2.81 544 110 13.8 51.6 560 13.4 602 13.2 5.68 3,419 2.85 545 no 17.5 49.8 549 13.2 593 13.1 5.66 3,356 2.95 544 107 17.6 50.6 552 13.8 598 12.6 5.62 3,364 2.96 551 109 17.6 50.5 569 13.5 35 Brockton — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 558 12.4 5.54 3,258 3.29 588 112 20.3 51.6 574 13 2 601 12.3 5.51 3,312 2.85 558 114 17.2 53.2 571 13.5 584 12.8 5.51 3,218 3.05 549 106 18.3 56.4 569 13.6 602 12.8 5.35 3,221 3.24 559 104 19.8 66.1 577 13.7 543 12.8 5.25 2,851 2.97 595 124 18.4 76.8 580 13.4 474 12.7 4.67 2,214 3.08 578 114 18.8 77.9 557 13.5 564 13.0 5.36 3,023 3.24 605 118 19.5 70.9 575 14.3 548 12.9 5.34 2,926 2.83 557 115 17.1 73.0 561 14.1 583 12.1 5.48 3,195 2.98 560 111 17.9 71.8 558 14.4 584 12.9 5.43 3,171 3.14 ' 575 111 18.7 78.1 570 13.8 582 13.1 5.52 3,213 3.19 580 112 19.2 76.2 576 13.9 566 13.5 5.42 3,068 3.01 551 104 18.1 80.0 555 12.8 578.5 13.8 5.67 3,289 2.98 560 112 17.7 51.2 559 13.8 Cambridge. 584 13.8 5.45 3,183 2.36 - - - 20.9 570 14.7 592 - 5.33 3,155 2.20 485 108 10.7 23.0 566 14.6 588 14.9 5.33 3,134 2.02 477 113 9.5 25.9 555 14.1 595 15.0 5.44 3,233 0.53 355 128 1.5 17.3 563 14.3 588 15.0 5.34 3,140 2.00 473 111 5.9 29.6 555 13.5 590 15.5 5.33 3,145 1.82 448 105 10.5 25.6 557 13.8 596 15.6 5.53 3,296 1.28 403 105 - 21.5 558 13.6 596 15.6 5.57 3,320 2.52 506 110 12.8 32.2 559 14.0 598 15.6 5.48 3,277 2.00 468 108 7.6 27.5 555 13.3 594 15.1 5.33 3,166 2.15 473 105 7.8 29.5 556 13.9 593 15.4 5.16 3,060 2.12 476 107 8.0 28.7 555 13.4 589 14.3 5.28 3,110 2.41 504 109 11.1 29.4 561 13.8 593 15.0 5.29 3,137 2.27 494 110 9.3 23.7 568 14.6 592 15.3 5.24 3,102 2.41 497 106 9.3 23.0 569 14.1 595 15.5 5.29 3,148 2.54 536 117 14.0 19.3 577 14.6 597 14.9 5.23 3,122 3.09 557 104 16.0 26.0 581 14.4 596 15.2 5.52 3,290 3.28 580 110 17.7 19.4 587 15.0 597 14.4 5.55 3,313 3.48 597 109 19.1 21.0 591 15.4 601 15.1 5.41 3,250 3.17 565 108 16.3 23.8 587 14.7 36 Cambridge — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 597 15.1 5.49 3,278 2.81 544 115 15.4 31.8 583 15.0 593 14.9 5.34 3,167 2.77 524 106 13.4 35.1 575 14.2 599 14.6 5.10 3,055 2.83 538 108 14.4 39.3 579 14.8 601 14.6 5.25 3,155 2.67 532 112 14.1 42.2 573 14.5 598 13.7 5.29 3,163 2.98 548 105 15.3 35.9 576 14.4 600 14.3 5.22 3,132 2.83 543 110 14.6 37.0 576 14.6 609 14.5 5.12 3,118 2.66 531 111 13.9 37.8 573 14.3 617 15.3 5.13 3,165 2.56 521 111 12.7 36.8 574 14.5 609 14.9 5.41 3,295 2.77 539 111 14.1 36.6 575 14.1 602 14.3 5.37 3,233 2.60 516 108 12.6 29.3 571 14.2 596 14.8 5.27 3,141 2.66 522 110 13.2 30.9 573 14.3 584 14.3 5.15 3,008 2.80 517 103 12.2 35.4 571 14.1 593 14.9 5.46 3,238 2.52 522 112 12.7 30.1 572 14.3 592 14.1 5.75 3,404 2.52 512 109 11.1 32.7 561 13.9 598 14.9 5.62 3,351 2.38 503 113 10.2 31.7 565 14.1 600 14.1 5.15 3,090 2.67 505 101 10.5 32.2 560 13.6 609 15.1 5.10 3,159 2.50 497 103 9.7 31.9 562 14.1 596 14.9 5.38 3,206 2.58 505 104 10.2 34.5 553 13.6 602 15.6 5.31 3,197 2.34 496 108 10.1 30.1 559 13.4 611 14.9 5.37 3,281 2.23 495 112 9.8 30.5 564 13.8 601 14.4 5.57 3,348 2.38 500 108 9.3 28.7 564 13.5 599 14.4 5.58 3,342 2.39 506 110 10.2 22.5 569 13.7 613 15.1 5.40 3,310 2.31 514 117 9.8 21.5 569 13.5 593 13.6 5.17 3,066 2.77 512 101 12.0 36.3 559 13.3 604 15.2 5.17 3,123 2.63 503 101 11.7 36.6 563 13.6 595 14.3 5.42 3,225 2.56 513 108 12.2 34.9 563 13.9 599 14.9 5.48 3,283 2.42 493 104 11.1 31.5 560 13.7 588 14.0 5.64 3,316 2.25 476 102 9.7 32.2 558 13.4 587 14.0 5.62 3,299 1.97 454 103 8.1 28.9 550 13.0 591 14.8 5.50 3,251 1.97 437 118 - 24.9 551 13.0 595 14.8 5.45 3,242 1.59 427 104 - 21.0 551 12.5 608 15.6 5.32 3,235 1.32 403 103 - 20.0 564 12.6 585 13.6 5.54 3,208 0.09 309 123 - 13.6 554 12.3 591 14.5 5.37 3,174 2.74 481 90 11.0 20.9 565 12.4 597 14.9 5.13 3,063 2.08 451 97 9.4 21.1 568 13.3 37 Cambridge — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 600 15.4 5.18 3,108 1.86 438 98 6.7 23.3 558 13.0 597 14.8 5.33 3,182 2.10 461 100 7.7 27.2 553 13.6 583 14.2 5.43 3,166 2.44 488 101 9.4 28.7 554 13.1 578 13.4 5.30 3,063 2.61 , 518 108 12.2 28.7 548 12.9 586 14.2 5.37 3,147 2.57 509 106 12.3 33.5 560 13.6 585 13.2 5.12 2,995 2.52 520 111 12.8 36.6 557 13.6 596 14.5 5.35 3,176 2.31 487 105 10.9 28.7 565 13.8 Charlestown. 611 16.8 5.26 3,215 - - - - - - - 612 16.7 5.30 3,243 - - - - - - - 617 16.6 5.27 3,251 - - - - - - - 607 16.5 5.40 3,297 - - - - - - 617 16.7 5.45 3,362 - - - - - - 630 16.7 5.58 3,514 - - - - - - - 625 17.0 ‘ 5.38 3,365 - - - - - - - 620 16.9 5.22 3,236 - - - - - - - 630 16.8 5.38 3,393 - - - - - - - 615 16.4 5.25 3,228 - - - - ' - - - 617 16.6 5.38 3,319 - - - - - - - 620 16.9 5.50 3,413 - - - - - - - 619 16.9 5.50 3,404 - - - - - - - 616 17.0 5.26 3,239 - - - - - - - 622 17.0 5.44 3,383 - - - - - - - 612 17.0 5.44 3,328 - - - - - . - - 606 16.8 5.15 3,121 - - - - - - - 602 16.8 5.11 3,078 - - - - - - - 601 16.5 5.11 3,072 - - - - - - - 602 16.7 4.91 2,958 - - - - - - - 609 16.8 5.04 3,067 - - - - - - - 597 16.8 5.21 3,109 - - - - - - - 596 16.6 5.05 3,011 - - - - - - - 602 16.9 5.11 3,075 - - - - - - - 596 16.7 5.24 3,124 - - - - 38 Charlestown — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 597 17.2 5.28 3,151 - - - - - - - 608 17.1 5.05 3,341 - - - - - - - 616 17.2 5.05 3,111 - - - - - - - 602 17.1 5.15 3,099 - , - - - - 603 17.2 5.03 3,032 - - - - - - - 618 16.6 5.05 3,122 - - - - - - - 609 16.7 5.04 3,069 - - - - - - - 611 16.8 5.27 3,209 - - - - - - - East Boston. - - 5.20 - 3.15 - - 20.8 73.0 586 16.8 - - 5.20 - 3.28 - - 20.2 70.0 572 16.5 - - 5.36 - 3.25 - - 20.1 72.0 576 16.4 - - 5.40 - 2.70 - - 18.6 71.0 549 14.3 - - 5.00 - 2.86 - - 18.0 72.0 548 15.7 - - 5.66 - 2.70 - - 19.0 71.0 542 14.9 - - 5.30 - 2.80 - - 18.9 68.0 550 15.5 - - 5.60 - 2.50 - - 18.3 70.0 534 15.2 - 5.40 - 2.66 - - 19.0 72.0 550 15.6 - - 5.53 - 2.70 - - 18.9 72.0 550 14.4 - - 5.80 - 2.80 - - 18.5 71.0 534 15.1 - - 5.50 - 2.60 - - 16.1 68.0 542 15.0 - - 5.35 - 2.68 - - 17.9 73.0 542 15.0 - - 5.25 - 2.47 - - 17.3 75.0 526 14.5 - - 5.72 - 2.55 - - 14.4 71.0 525 14.0 - - 5.00 - 2.60 - - 14.5 75.0 527 12.5 - - 5.20 - 2.60 - - 14.0 72.0 525 12.0 - - 5.10 - 2.70 - - 15.1 74.0 524 13.0 - - 5.26 - 2.76 - - 16.1 73.0 526 11.6 - - 5.30 - 2.70 - - 15.7 74.0 522 12.8 - - 5.40 - 2.90 - - 16.6 70.0 521 12.5 - - 5.17 - 2.73 - - 14.4 71.0 535 13.4 - - 4.86 - 2.57 - - 14.5 74.0 534 13.3 - - 4.80 - 2.59 - - 15.3 73.0 536 14.2 39 East Boston — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. - - 4.52 - 2.71 - - 16.2 77.0 546 14.4 - - 4.83 - 2.72 - - 18.4 81.0 534 15.2 - - 5.10 - 2.56 - - 17.2 76.0 522 14.7 - 4.88 - 3.06 - - 17.7 88.0 538 15.8 - - 4.99 - 2.61 - - 16.5 69.0 534 13.8 - - 4.53 - 2.69 - - 15.4 77.0 517 12.5 - - 4.84 - 2.77 - - 16.9 74.0 528 14.7 T- - 4.99 - 2.95 - - 15.6 70.0 520 13.1 - - 4.65 - 2.83 - - 16.5 75.0 527 13.5 - 4.82 - 2.85 - - 15.5 71.0 515 13.0 - - 4.54 - 2.73 - - 18.2 86.0 519 14.9 - - 4.66 - 2.70 - - 18.1 85.0 521 14.4 - - 4.58 - 2.95 - - 17.9 80.0 523 14.2 - - 5.34 - 2.87 - - 18.0 84.0 - - ' - - 4.91 - 2.90 - - 19.0 85.0 534 15.9 - - 5.31 - 2.87 - - 18.1 83.0 551 14.5 - - 5.57 - 2.93 - - 18.2 83.0 538 14.9 - - 5.08 - 2.86 - - 18.0 83.0 543 14.9 - - 5.08 - 2.95 - - 18.4 84.0 551 15.5 - - 5.46 - 2.91 - 18.0 82.0 546 14.7 - - 5.40 - 2.90 - - 19.9 84.0 548 15.1 - - 5.70 - 2.91 - - 19.9 83.0 549 15.6 - - 5.00 - 3.00 - - 19.2 84.0 534 15.4 - - 5.10 - 3.10 - - 19.2 85.0 545 15.2 - - 5.30 - 2.90 - - 18.7 83.0 529 14.6 - - 5.30 - 2.89 - - 18.9 84.0 546 15.4 - - 5.07 - 2.94 - - 18.9 85.0 532 14.8 " - 5.15 - 2.78 - - 17.5 76.6 537 14.5 40 Fall River. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 565 15.0 5.67 3,200 2.81 545 Ill 19.1 - 548 15.3 551 14.2 5.63 3,100 2.88 556 113 18.6 554 15.2 573 15.1 5.65 3,240 2.89 540 107 18.7 - 563 16.7 564 15.0 5.66 3,190 2.86 534 106 18.4 - 565 - - 14.9 5.71 - 2.94 533 103 18.5 47.0 549 14.5 553 15.9 5.72 3,163 2.99 558 110 18.4 47.3 563 15.4 580 16.3 5.69 3,295 2.86 541 108 17.3 48.0 562 15.7 567 15.8 5.59 3,165 3.00 546 106 17.3 51.0 553 J5.3 553 15.1 5.84 3,220 3.06 558 108 17.7 50.7 550 15.1 543 14.9 5.67 3,075 3.02 558 108 17.8 51.6 561 - 560 15.4 5.83 3,265 2.89 533 101 17.9 50.7 556 14.9 561 16.3 5.68 3,185 2.96 556 110 18.3 48.1 560 15.5 564 15.7 5.87 3,310 3.11 548 102 18.3 48.4 562 15.1 568 15.3 5.62 3,190 3.00 550 107 18.2 48.2 563 14.6 567 15.7 5.66 3,205 3.05 553 107 18.1 47.3 556 14.2 566 15.7 5.67 3,210 3.16 - - 18.0 46.6 562 14.2 551 15.2 5.80 3,195 3.08 549 105 17.8 44.1 555 14.2 560 15.7 5.67 3,175 2.95 550 109 17.7 48.0 556 14.1 559 16.0 5.82 3,255 2.88 - - 17.5 46.0 556 14.1 563 15.5 5.52 3,108 3.01 549 107 17.9 48.9 547 13.7 560 15.6 5.72 3,145 3.12 - - 17.6 50.5 553 14.2 558 15.4 5.79 3,235 2.92 - - 17.8 48.7 554 14.8 560 16.4 5.60 3,135 2.92 - - 17.8 48.9 557 15.4 573 16.3 5.35 3,065 2.96 - - 17.7 50.4 559 14.9 576 15.6 5.46 3,145 3.02 - - 17.6 50.8 552 14.2 566 15.8 5.58 3,160 3.03 - - 17.3 50.5 560 14.3 563 15.5 5.59 3,145 3.04 - - 17.2 45.5 553 13.9 574 15.7 5.07 2,910 3.11 - - 17.5 53.4 561 14.1 577 15.7 5.01 2,890 2.98 - - 17.1 56.2 561 14.4 569 15.9 5.30 3,015 3.10 - - 17.2 46.4 563 14.7 569 16.3 5.50 3,130 3.00 - - 16.9 46.7 562 14.8 570 16.1 5.52 3,145 3.04 - - 16.9 44.0 560 14.6 551 14.9 5.84 3,215 3.03 - - 16.9 42.5 546 13.7 543 14.7 5.78 3,140 2.97 - - 16.6 42.5 548 13.7 541 14.8 5.58 3,020 2.96 - - 16.8 43.2 552 13.9 41 Fall River — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. . Per Cent. H 2 0. B.T.U. Candle Power. 554 15.4 5.51 3,050 3.01 - - 16.7 44.6 553 13.8 545 14.9 5.70 3,110 3.02 - - 16.8 43.8 544 - 541 14.8 5.70 3,080 3.10 - - 16.8 45.9 544 - 542 14.8 5.69 3,090 3.09 - - 16.8 45.2 528 - - 14.6 5.71 - 2.99 - - 16.8 43.1 535 - - 14.9 5.68 - 2.95 - - 16.8 45.6 532 - 580 15.5 5.79 3,360 2.93 - - 16.7 46.8 515 - 536 14.1 5.66 3,065 2.90 - - 16.7 50.1 539 - 543 14.6 5.66 3,075 2.90 - - 16.5 53.0 555 - 553 14.3 5.70 3,150 2.85 - - 16.1 52.4 547 - 553 14.4 5.79 3,200 2.79 - - 16.2 50.0 548 - 566 15.8 5.52 3,125 2.77 - - 16.1 52.0 555 - 558 15.1 5.60 3,126 2.80 - - 16.0 52.0 548 - 548 14.3 5.75 3,150 2.80 546 112 16.0 49.9 545 15.3 548 15.7 5.66 3,100 2.73 535 110 16.0 50.4 542 15.7 548 14.3 5.76 3,160 2.76 542 112 16.1 51.0 543 15.2 553 15.0 5.95 3,290 2.77 546 113 16.1 49.3 547 15.4 549 15.4 5.91 3,240 2.73 545 114 16.0 44.3 551 15.2 544 14.4 5.94 3,230 2.68 536 112 15.8 48.7 539 14.4 521 14.5 5.91 3,079 2.74 537 111 15.7 53.0 543 14.3 555 15.5 5.78 3,205 2.68 537 112 - 54.0 546 14.6 536 14.3 5.70 3,055 2.63 535 113 - 55.9 544 14.4 532 14.5 5.70 3,035 2.80 529 106 - 58.8 542 15.3 545 14.3 5.42 2,950 3.00 538 103 - 62.0 546 15.4 544 15.0 5.85 3,180 2.86 553 112 - 55.7 540 15.2 532 14.0 5.84 3,105 2.83 535 107 - 57.3 536 14.6 569 15.1 5.66 3,146 2.93 545 109 17.2 47.5 534 144 Fitchburg. 550 - 5.07 2,788 3.00 530 100 - 64.8 551 17.0 579 15.8 5.00 2,894 3.18 556 104 17.7 63.8 545 - 564 - 4.50 2,537 3.30 569 105 - 61.3 532 15.3 548 14.7 4.55 2,493 3.34 603 115 18.5 64.7 553 16.3 548 14,8 4.02 2,203 3.50 569 100 19.1 62.2 545 16.3 42 Fitchburg — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Cals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 545 14.6 4.30 2,344 3.25 580 110 18.5 66.0 550 16.5 592 15.5 4.68 2,771 3.31 579 106 20.2 66.2 579 17.0 558 - 5.52 3,081 3.05 566 113 - 62.1 547 - 536 15.2 5.61 3,007 3.02 556 109 17.5 56.2 539 16.0 532 14.8 5.71 3,038 2.89 552 111 17.0 52.1 536 15.8 575 15.5 5.62 2,232 2.78 551 114 16.6 45.0 532 16.0 560 15.4 5.32 2,979 2.64 508 101 15.1 47.8 526 15.3 550 15.0 5.54 3,047 2.77 506 99 15.9 46.2 527 15.5 579 15.1 5.60 3,242 2.83 513 99 15.2 55.6 531 15.1 532 14.4 6.00 3,192 3.57 581 103 17.7 53.7 542 15.9 542 14.5 5.80 3,143 3.60 572 100 18.0 53.4 558 16.1 565 14.6 6.00 3,390 3.53 578 103 17.6 61.9 567 15.9 553 14.7 5.50 3,042 3.51 590 107 17.8 49.7 570 16.1 553 14.7 5.45 3,013 3.53 585 105 17.5 45.9 564 16.1 570 14.8 5.65 3,221 3.53 576 102 17.8 48.9 561 16.2 554 14.7 5.73 3,174 3.52 592 107 17.9 44.7 564 16.2 566 14.6 5.67 3,209 3.41 573 104 17.1 51.8 566 15.9 539 14.3 5.57 3,202 3.41 581 107 17.7 48.5 557 15.7 544 14.2 5.71 3,106 3.35 607 116 17.4 50.5 555 15.7 561 14.6 5.66 3,175 3.28 582 110 17.1 41.4 553 15.5 554 14.4 5.50 3,113 3.20 576 110 17.3 41.8 544 15.5 553 14.3 5.59 3,091 3.28 560 105 17.3 38.8 549 15.1 553 14.0 5.50 3,041 3.20 564 107 17.1 41.9 561 15.3 549 14.2 5.47 3,003 3.27 575 108 17.6 43.5 554 15.6 556 13.8 5.91 3,285 3.22 570 108 17.5 40.8 540 15.4 557 14.2 5.52 3,074 3.25 542 98 16.6 43.7 540 15.2 549 13.9 5.53 3,035 3.15 558 106 16.9 34.5 538 15.0 564 14.5 5.76 3,248 3.24 558 104 17.2 41.5 551 15.3 585 14.8 5.66 3,311 3.26 543 99 16.6 39.4 549 15.0 564 14.4 5.90 3,327 3.27 536 96 16.6 40.8 538 15.0 542 14.2 6.00 3,252 3.23 551 100 16.4 47.2 549 15.1 555 14.6 6.02 3,341 3.22 556 103 17.5 43.9 544 15.5 540 14.2 5.89 3,180 3.23 548 100 16.0 48.3 539 14.9 546 13.8 5.98 3,265 3.20 577 111 16.4 45.1 543 14.8 562 14.1 5.47 3,074 3.03 568 113 15.5 43.6 553 14.9 43 Fitchburg — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 539 13.6 5.93 3,196 2.91 553 Ill 15.3 49.1 542 14.4 551 13.8 5.92 3,261 2.92 548 109 15.6 44.4 543 14.4 559 14.6 5.67 3,169 2.84 542 109 15.1 46.1 554 14.7 561 14.7 5.55 3,113 2.68 533 111 14.8 48.6 540 14.7 567 14.4 5.77 3,271 2.65 534 112 14.0 54.3 538 14.1 529 12.9 5.94 3,284 2.61 533 113 15.4 54.0 531 13.1 528 12.5 6.00 3,120 2.99 550 108 16.1 61.0 535 13.7 559 12.8 6.00 3,354 3.06 552 106 16.3 59.0 540 14.3 523 12.2 6.30 3,295 2.80 541 110 15.4 58.0 529 13.6 549 13.4 6.10 3,370 2.96 539 105 15.4 61.0 534 14.7 535 13.7 5.90 3,167 2.92 537 105 15.5 54.0 543 15.2 550 14.2 5.84 3,212 2.93 537 105 15.8 53.0 543 15.0 549 12.8 5.49 3,014 2.91 520 100 15.7 56.0 545 14.0 552 13.4 5.49 3,030 2.78 533 108 16.0 57.0 543 14.8 574 14.6 5.53 3,174 2.86 535 106 15,4 58.0 550 15.2 539 13.2 5.59 3,013 2.88 528 103 14.6 68.0 530 13.5 521 13.0 5.84 3,022 3.01 545 105 16.2 62.0 538 14.8 526 12.9 5.48 2,882 3.22 540 98 16.8 63.0 535 - 529 13.0 5.48 2,898 3.25 555 102 16.6 67.0 543 15.1 521 13.0 5.47 2,850 3.89 572 96 20.2 39.0 549 15.1 552 14.1 5.58 3,064 3.14 557 106 16.7 52.1 545 15.2 Haverhill. - - - - 2.90 558 113 17.0 - - - - - - - 2.96 558 111 16.5 - - - - - - - 2.76 536 109 17.9 - - - - - - - 2.89 559 114 - - - - - - - - 2.79 547 113 17.7 - - - - - - - 2.80 537 108 16.0 - , - - - - ' - 2.95 551 109 16.8 - - - - ' - - - 2.95 566 113 17.5 - - - - - - - 3.60 558 96 16.4 - - - - - - - 3.09 570 111 17.7 - - - - - - - 2.90 559 113 16.8 - - - 44 Haverhill — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. - - - - 3.08 566 110 16.7 - - - - - - - 3.03 557 109 19.3 - - - - - - - 3.13 555 104 18.5 - - - - - - - 3.06 554 107 18.9 - - - - - - - 3.05 553 107 19.1 - - - - - - - 3.03 549 106 19.7 - - - - - - - 3.04 546 105 16.1 - - - - - - - 2.96 552 109 18.6 - - - - - - - 2.94 555 107 17.6 - - - - - - - 2.92 544 108 18.3 - 565 17.3 - - - - - 554 - 17.8 - 561 16.9 - - - - 3.17 552 101 17.4 - 550 16.1 - - - - 2.96 546 107 16.6 - 546 15.9 - - - - 3.15 552 101 17.5 - 552 16.0 - - - - 2.97 549 108 17.5 ' - 560 15.9 - - - - 2.94 544 107 16.4 - 550 15.7 - - - - 2.82 539 109 15.5 - 551 15.6 - - - - 2.81 544 110 16.4 - 551 15.6 - - - - 2.85 542 112 15.2 - 542 14.7 - - - - 2.88 547 110 15.8 - 547 15.0 - - - - 2.92 555 111 16.0 - - - - - - - 2.81 560 116 15.7 - 560 15.8 ' - - - - 2.84 545 110 14.3 - 545 14.9 - - - - 2.84 553 113 15.0 - 553 15.5 - - - - 2.73 549 115 15.5 - 549 15.0 - - - - 2.87 552 109 15.3 - 552 15.4 - - - - 2.99 552 108 15.6 - 552 16.1 - - - 2.78 551 114 14.9 - 551 16.1 - - - - 2.73 556 118 15.2 - 556 16.0 - - - - 2.82 548 112 14.2 - 548 15.6 - - - 2.86 553 113 14.6 - 553 16.3 - - - - 2.82 551 113 14.3 - 551 16.1 - - - - 2.69 547 116 15.4 - 547 15.3 - - - - 2.71 554 118 16.7 - 554 15.7 - - - - 2.64 542 116 15.7 - 542 15.1 45 Haverhill — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. - - - - 2.63 534 113 13.4 - 534 14.6 - - - - 2.73 543 113 14.7 - 543 14.9 - - - - 2.47 532 118 13.9 - 532 14.4 - - - - 2.75 535 110 14.2 - 535 14.2 - - - - 2.64 538 114 14.6 - 538 14.5 - - - - 2.63 522 108 13.3 - 522 13.8 - - - - 2.72 524 107 14.2 - 524 14.1 - - - - 2.88 537 105 15.6 - 537 14.6 - - - - 2.72 529 108 14.6 529 14.3 - - - - 2.93 536 104 14.8 - 536 14.6 - - - - 2.76 - - - - - 15.5 - - - 2.63 530 Ill 15.7 - 530 14.7 - - - - 2.56 525 112 14.4 - 525 14.8 - - - - 2.87 547 110 16.1 - 545 15.3 Holyoke. 592 14.4 5.23 3,096 2.84 550 112 16.1 45.0 571 14.8 593 15.7 5.17 3,066 3.05 569 112 14.0 48.0 579 15.2 - - - - 3.82 650 116 19.1 - - - 603 16.3 - - - 574 - 16.0 75.0 581 16.0 590 15.5 - - - 626 - 17.4 75.0 610 16.7 581 15.3 5.35 3,108 3.39 568 103 17.1 35.0 573 - - - 5.69 - 3.20 - - - 43.0 - - 588 14.4 5.36 3,152 3.60 592 105 17.1 56.0 581 - 590 15.2 5.42 3,198 3.42 583 107 17.4 30.0 - - 599 15.0 5.13 3,073 3.39 603 113 16.9 36.0 601 15.7 585 14.1 5.46 3,194 3.57 619 114 17.6 39.0 - - 582 14.7 5.08 2,957 3.39 602 112 16.7 53.0 - - 570 13.4 5.18 2,953 3.24 590 116 16.0 46.0 546 14.3 570 13.0 4.78 2,725 3.35 577 107 16.2 53.0 558 13.3 - - 4.83 - 3.36 - - - 55.0 548 572 12.0 4.25 2,431 3.15 554 105 15.8 63.0 545 - 575 13.0 4.52 2,609 3.19 560 106 15.7 59.0 537 - 573 13.2 4.73 2,710 3.10 570 111 14.7 68.0 555 - 46 Holyoke — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 575 14.2 4.30 2,473 3.06 563 110 15.4 71.0 552 - 560 13.1 4.50 2,520 3.12 582 115 15.8 * 70.0 559 - 570 14.2 4.47 2,548 2.76 557 117 13.7 65.0 546 - 579 14.0 4.73 2,739 2.72 571 124 13.3 61.0 557 - 573 13.6 4.74 2,716 2.72 529 108 14.3 67.0 527 - 553 13.1 4.04 2,240 2.98 561 112 15.3 71.0 544 - 587 15.4 4.23 2,483 3.02 581 117 15.5 80.0 469 - 555 14.2 5.55 3,080 2.93 563 116 15.0 66.0 546 - 581 14.7 5.20 3,021 3.62 600 107 18.6 63.0 577 - - - 5.30 - 3.51 - - - 65.0 562 - 575 14.2 5.62 3,232 3.28 587 112 15.9 75.0 660 - 563 13.3 5.44 3,062 3.14 583 114 15.6 73.0 569 - 562 12.3 5.30 2,979 2.95 534 103 15.1 66.0 541 - 583 13.0 5.39 3,142 2.90 540 107 14.3 75.0 555 - 563 13.6 4.67 2,629 2.86 544 109 15.2 80.0 541 - 576 14.1 4.80 2,765 2.97 551 109 15.1 80.0 562 - 572 14.7 4.77 2,728 2.90 557 113 15.2 72.0 547 - 569 14.3 5.22 2,970 2.97 564 113 14.6 80.0 548 - 571 10.3 5.33 3,043 3.05 580 115 15.0 76.0 554 - 585 12.2 4.77 2,790 3.09 586 116 15.4 79.0 571 - 573 11.2 5.18 2,968 2.93 597 126 15.1 79.0 577 15.9 575 7.7 3.50 2,012 3.13 575 111 14.2 86.0 553 - 565 8.7 4.31 2,435 2.92 590 123 14.7 80.0 581 - 581 9.2 4.35 2,527 3.00 580 117 15.0 91.0 - - 577 13.4 4.92 2,826 3.16 576 111 15.8 64.6 561 15.2 Lowell. 593 14.8 5.30 3,143 3.78 578 98 18.0 45.0 590 16.6 584 16.1 5.30 3,095 3.94 573 93 17.8 17.5 584 16.6 596 14.3 5.38 3,205 3.45 570 103 16.7 22.9 591 15.0 595 15.4 5.37 3,195 3.52 569 100 17.2 21.4 583 15.7 594 14.2 5.40 3,207 3.50 567 100 16.7 25.9 575 15.5 581 13.8 5.42 3,150 3.76 592 102 18.1 30.4 584 14.8 598 14.6 5.38 3,216 3.41 569 103 17.6 33.0 588 14.9 -1 47 Lowell — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 591 14.7 5.40 3,192 3.33 559 100 16.6 33.5 583 14.8 591 15.1 5.38 * 3,180 3.45 572 103 17.2 32.0 592 15.5 600 15.8 5.39 3,232 3.79 604 104 19.3 28.3 597 15.4 599 15.3 5.38 3,229 4.03 620 103 19.0 29.3 604 16.7 599 15.2 5.36 3,213 3.78 601 104 18.9 31.2 599 15.9 593 15.0 5.41 3,207 3.66 601 106 19.3 31.8 595 16.1 594 15.0 5.40 3,209 3.73 600 104 18.8 31.2 596 16.1 596 14.9 5.39 3,215 3.80 601 103 18.8 27.8 600 15.5 595 14.5 5.37 3,194 3.85 591 100 18.2 34.2 601 15.6 608 15.2 5.3Q 3,183 3.79 600 103 18.9 33.6 604 15.7 591 15.4 5.43 3,206 3.58 596 107 18.8 31.6 592 15.2 584 14.7 5.45 3,180 3.55 579 103 18.2 31.5 584 15.3 582 13.3 5.39 3,139 3.33 558 97 16.3 35.2 583 14.7 586 13.9 5.44 3,185 3.24 551 101 15.4 34.7 572 14.8 586 14.1 5.42 3,177 3.33 550 99 15.6 33.4 579 13.9 612 16.0 5.39 3,299 3.20 559 105 16.6 35.8 585 14.3 602 15.0 5.38 3,242 3.10 551 105 15.5 35.3 589 14.5 597 13.2 5.37 3,206 3.24 542 99 14.1 34.7 588 14.0 604 15.1 5.36 3,238 3.22 564 106 15.2 34.6 590 14.4 606 14.8 5.34 3,238 2.90 541 107 14.5 36.2 577 14.3 611 14.9 5.36 3,275 2.89 534 105 14.1 34.0 577 13.8 600 13.4 5.43 3,258 3.01 524 98 12.5 32.1 572 13.3 590 14.9 5.37 3,171 2.55 507 107 12.7 29.0 577 13.3 603 14.8 5.33 3,215 2.40 497 106 12.5 31.9 573 13.5 591 14.7 5.32 3,142 2.36 481 101 10.9 28.1 567 13.9 599 15.1 5.27 3,154 2.44 484 98 10.4 28.6 568 14.3 593 15.3 5.32 3,153 2.26 479 103 9.8 27.5 568 13.5 591 14.9 5.37 3,174 2.17 451 94 10.1 26.7 562 13.7 600 15.6 5.42 3,252 2.26 465 97 10.0 24.2 569 13.0 594 15.0 5.42 3,219 2.22 470 100 9.1 25.4 568 12.5 607 15.4 5.38 3,266 2.27 479 103 9.5 23.3 586 13.2 600 15.1 5.39 3,234 2.12 466 103 9.3 25.3 585 13.3 598 15.6 5.37 3,119 2.22 463 97 9.1 24.7 587 12.9 607 15.5 5.30 3,417 2.16 460 98 8.9 27.7 579 12.5 607 15.0 5.32 3,213 2.17 462 99 8.6 25.3 580 12.3 48 Lowell — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 603 14.7 5.35 3,126 2.21 465 94 9.1 27.2 574 12.5 584 14.2 5.40 3,154 2.61 475 91 10.1 36.6 577 11.2 598 15.5 5.36 3,205 2.48 490 100 11.1 27.5 586 12.5 594 15.3 5.28 3,136 2.57 482 95 10.8 28.5 586 13.1 605 15.7 5.21 3,152 3.38 506 114 12.6 27.6 588 13.1 604 15.8 5.31 3,207 3.39 531 92 14.0 28.6 584 14.3 608 15.5 5.37 3,265 3.01 544 105 14.5 26.9 587 14.7 596 14.9 5.41 3,224 2.97 513 96 13.0 27.3 584 14.2 599 16.1 5.38 3,222 3.01 533 101 13.5 26.9 587 15.1 591 15.7 5.41 3,215 3.13 533 98 14.6 24.2 586 15.6 607 16.5 5.65 3,430 3.22 545 100 15.8 29.9 590 15.7 597 15.1 5.39 3,218 3.03 540 103 14.0 29.5 589 14.6 573 14.9 5.38 3,083 3.10 509 91 13.1 26.5 562 14.2 - 15.5 5.37 - 3.19 - - 13.7 31.3 - 14.2 - 15.5 5.35 - 3.07 — 13.3 27.8 - 14.1 - 15.0 5.46 - 3.12 - - 13.4 30.3 - 13.3 582 15.3 5.42 3,154 3.37 526 92 12.7 28.3 573 14.8 591 16.3 5.32 3,150 3.63 557 95 17.0 28.1 591 15.6 572 14.9 5.42 3,100 3.94 561 90 15.3 31.2 576 14.4 594 15.0 5.43 3,201 3.08 536 100 14.3 29.6 584 14.3 Lynn . 577 14.7 5.33 3,075 2.99 567 113 19.0 50.0 574 16.5 568 13.3 5.37 3,050 3.03 579 116 19.5 - 580 16.8 564 15.3 5.25 2,961 2.97 575 117 18.7 - 581 17.8 617 14.7 5.20 3,208 3.06 573 113 17.8 - - - 578 13.8 5.25 3,034 - - - - - 578 15.8 574 16.2 5.18 2,973 2.88 548 110 17.1 - 579 16.7 541 15.1 5.08 2,748 2.84 543 109 16.9 - 565 16.1 596 15.5 5.13 3,057 2.94 544 105 16.8 - 566 16.3 552 15.2 5.47 - 2.87 517 103 - 50.0 560 16.5 567 - 5.37 3,044 2.74 509 104 - 38.0 547 - 571 - 5.24 2,992 2.68 518 110 - 41.0 549 16.9 562 - 5.28 2,970 2.66 519 111 - 38.0 556 - 49 Lynn — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 577 - 5.15 2,961 2.73 518 107 - - 549 14.1 587 15.3 5.15 3,023 2.95 548 108 17.4 45.0 566 15.5 581 15.9 5.15 2,992 3.06 571 113 17.0 50.0 562 - 590 14.7 5.08 2,997 3.15 565 108 16.9 49.0 570 15.1 595 14.8 5.35 3,183 2.96 547 107 17.6 48.0 564 - 569 - 5.35 3,044 2.96 555 110 - 48.0 562 - 565 - 5.43 3,068 3.01 565 112 - 58.7 555 - 549 - 5.32 2,920 2.95 573 116 - 62.8 557 - 559 - 5.29 2,957 2.79 558 117 - 58.0 560 - 590 - 5.26 3,103 2.85 554 113 - 59.0 555 - 577 - 5.09 2,937 3.07 550 106 - 64.0 553 - 576 - 5.52 3,179 3.04 545 105 - 59.0 550 - 571 5.50 3,140 3.14 551 104 - 55.0 552 - 565 - 5.51 3,113 3.41 558 100 - 56.3 560 - 570 - 5.46 3,112 3.21 570 108 - 57.0 556 - 567 - 5.58 3,163 3.07 561 109 - 51.2 550 . - 565 - 5.45 3,079 3.16 567 109 - 46.8 549 - 550 14.0 5.43 2,987 3.11 551 105 - 45.0 550 13.8 551 11.8 5.24 2,887 3.28 563 104 - 43.7 562 14.6 571 12.6 5.16 2,946 3.49 570 101 - 38.8 568 14.0 570 11.3 5.19 2,958 3.25 558 103 17.7 39.0 573 14.4 580 12.9 5.35 3,103 2.84 530 105 17.7 33.0 562 14.4 - - 5.31 - 2.81 534 106 - 34.3 554 13.5 561 12.1 5.19 2,911 2.84 526 104 12.9 34.5 557 13.5 554 10.7 5.29 2,930 2.73 521 105 14.0 33.2 555 13.6 - - 5.23 - 2.74 530 108 - 35.9 556 13.6 - - 5.21 - 2.66 529 110 - 39.3 552 13.6 583 13.1 5.23 3,049 2.51 509 107 14.3 37.3 555 13.9 588 11.1 5.12 3,010 2.50 500 104 11.5 35.5 563 13.6 - - 5.34 - 2.51 509 107 - 42.7 551 12.8 564 - 5.26 2,966 2.47 - - - 43.0 537 13.3 553 - 5.35 2,958 2.52 503 105 - 43.6 537 12.4 561 - 5.30 2,973 2.48 495 103 - 43.0 536 12.2 550 - 5.05 2,770 2.54 495 100 - 46.0 540 12.6 565 - 4.94 2,791 2.57 502 103 - 51.0 542 12.4 50 Lynn — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 567 - 5.12 2,903 2.56 495 100 - 47.9 535 - 574 - 5.02 2,881 2.47 485 99 - 49.6 529 12.7 571 - 5.02 2,866 2.51 494 101 - 45.5 531 12.8 510 - 5.06 2,580 2.47 515 111 - 45.4 535 13.0 526 - 4.95 2,603 2.48 488 100 - 49.4 530 12.6 547 - 4.80 2,625 2.48 492 105 - 53.6 528 12.7 548 - 4.92 2,697 2.47 508 109 - 51.2 526 12.5 569 - 4.97 2,817 2.74 508 100 - 51.4 539 - 590 - 5.14 3,032 2.99 550 108 - 51.4 544 - 573 - 5.23 2;996 3.02 549 107 - 49.0 546 13.1 560 - 5.12 2,867 2.91 531 100 - 46.8 546 13.1 553 - 5.08 2,809 2.94 540 105 - 48.1 546 13.1 562 - 4.98 2,798 2.96 530 110 - 46.3 546 13.4 567 13.8 5.22 2,962 2.85 535 107 16.2 46.9 553 14.1 Malden. 575 14.9 4.58 2,633 3.14 575 111 17.2 70.5 566 15.8 585 14.9 4.83 2,835 3.28 522 92 16.3 67.0 557 15.6 575 14.9 4.87 2,790 3.07 548 105 16.2 68.6 560 15.7 578 14.9 ' 4.83 2,792 3.02 561 111 16.2 70.9 564 15.7 585 15.1 4.88 2,854 3.10 561 108 16.2 71.2 559 15.1 563 14.6 4.90 2,759 2.88 546 109 15.9 69.8 544 14.9 574 14.6 4.85 2,784 2.55 520 114 14.9 70.7 533 14.5 562 14.4 4.88 2,743 2.78 517 102 14.7 70.1 522 13.6 549 13.9 4.88 2,677 3.02 533 101 16.0 69.0 545 14.1 557 14.1 4.85 2,701 2.76 536 108 15.7 70.2 533 14.0 567 13.9 4.90 2,778 3.08 546 104 15.7 66.0 551 14.3 570 14.3 4.90 2,793 3.05 548 105 15.3 66.0 546 14.0 573 14.1 4.81 2,756 3.00 543 105 15.9 67.0 558 14.1 565 14.2 4.62 2,610 2.97 551 108 16.2 69.9 547 14.7 550 14.1 4.70 2,585 3.01 556 109 15.7 68.0 538 14.1 566 14.2 4.69 2,655 2.95 541 106 15.7 70.0 541 14.0 570 14.3 4.75 2,708 3.03 529 100 15.5 68.0 539 13.9 558 13.9 4.70 2,623 3.08 543 103 15.8 70.0 542 13.9 51 Malden — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 561 13.9 4.59 2,575 3.01 547 106 15.8 71.7 542 14.0 560 13.7 4.73 2,648 3.15 538 100 15.7 70.0 543 13.8 558 13.9 4.81 2,684 3.26 543 99 15.9 69.0 543 14.1 556 13.7 4.90 2,729 3.13 556 106 16.8 71.0 548 14.3 559 13.5 4.76 2,661 2.78 557 117 16.8 74.0 548 14.2 556 12.9 4.70 2,613 3.19 564 107 17.1 75.8 551 14.4 548 12.1 4.85 2,658 3.15 546 102 16.2 74.9 526 13.2 540 11.5 4.84 2,614 3.12 558 107 16.7 75.0 534 13.4 555 12.1 4.74 2,631 3.10 560 108 17.3 75.0 550 14.4 567 13.2 4.66 2,642 3.18 565 109 17.3 73.8 554 15.1 548 11.9 4.74 2,598 2.97 545 106 16.6 72.6 531 13.8 554 12.6 4.79 2,654 3.01 547 106 16.9 72.9 535 13.4 567 12.8 4.84 2,744 2.98 545 106 16.7 72.5 536 13.4 573 13.1 4.81 2,756 2.93 542 103 16.2 67.3 543 13.7 566 12.6 4.90 2,773 2.86 534 106 15.8 63.0 535 13.5 567 12.2 4.90 2,778 2.92 529 103 16.3 63.0 531 13.1 560 12.2 4.90 2,744 2.92 513 97 15.7 62.0 523 12.3 567 12.8 4.90 2,778 2.82 511 95 15.9 58.9 531 12.9 586 12.9 4.69 2,748 2.86 524 103 16.3 67.0 542 13.3 585 13.5 4.76 2,785 2.94 521 99 15.8 66.8 65.8 544 13.7 548 11.2 4.89 2,680 2.93 505 94 15.8 520 12.4 568 12.1 4.84 2,749 2.85 528 104 16.6 67.1 543 13.5 565 12.1 4.56 2,576 2.97 552 106 16.5 70.1 549 14.6 558 12.0 # 4.65 2,595 3.01 544 105 16.9 70.3 541 13.9 563 11.7 4.83 2,719 3.10 550 105 17.1 70.3 544 14.1 565 11.5 4.77 2,735 3.04 534 101 16.2 70.7 542 14.0 564 11.6 4.63 2,611 2.95 540 105 16.5 73.0 545 14.2 556 11.1 4.58 2,537 2.94 551 110 16.9 75.0 542 14.0 534 9.9 4.66 2,488 2.98 542 105 16.5 75.0 530 12.7 533 10.0 4.68 2,494 2.89 539 107 16.7 75.0 533 13.9 528 10.0 4.53 2,392 2.86 543 109 17.4 75.9 534 13.6 528 10.1 4.89 2,582 2.86 541 108 17.1 73.8 535 13.8 535 9.9 4.90 2,622 2.99 539 104 17.1 74.4 534 14.4 539 11.5 4.90 2,641 2.88 536 106 16.9 75.8 535 13.9 547 10.0 4.90 2,680 2.87 548 111 18.2 75.0 539 14.3 52 Malden — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 550 10.3 4.90 2,695 2.93 544 107 17.2 76.9 538 14.5 538 9.8 4.90 2,636 2.95 537 108 16.6 81.4 531 14.0 519 9.1 4.90 2,543 2.92 546 108 17.2 81.6 530 14.1 521 8.7 4.90 2,553 2.93 547 108 17.0 84.4 535 - 505 9.2 4.90 2,475 2.90 547 110 17.2 81.5 535 14.3 510 8.7 4.90 2,499 2.89 546 109 17.0 79.3 528 13.9 557 12.4 4.79 2,666 2.97 542 106 16.4 71.3 541 14.0 New Bedford. 623 15.3 5.07 3,159 3.48 562 99 15.1 70.0 560 15.2 627 15.3 5.17 3,242 3.38 609 115 15.1 70.0 550 15.3 627 15.3 5.15 3,229 3.59 582 103 17.0 66.0 578 16.8 626 15.4 5.12 3,205 2.64 531 111 14.0 70.0 516 14.8 623 15.1 5.12 3,190 3.79 595 100 17.6 72.0 577 16.9 627 14.9 4.97 3,116 3.44 592 109 17.6 69.0 591 16.8 619 14.8 5.16 3,194 3.35 579 107 17.3 75.0 570 16.6 598 14.5 4.98 2,969 3.36 554 100 17.1 78.0 559 16.7 631 14.7 5.16 3,256 3.24 565 106 17.4 76.0 567 16.7 623 14.4 5.24 3,265 3.13 561 107 17.3 78.0 572 16.6 617 14.7 5.05 3,116 3.20 560 105 17.5 78.0 573 16.5 622 14.7 5.02 3,122 3.20 572 109 17.3 76.0 575 16.4 - 14.2 5.11 - 3.27 - - 17.6 74.0 569 16.3 - 12.3 5.23 - 3.38 - - 16.9 73.0 > 554 16.0 - 12.6 5.10 - 2.90 - - 16.3 75.0 547 15.5 - 12.6 5.21 - 3.11 - - 16.7 73.0 556 15.5 604 14.0 5.14 3,105 3.16 547 96 17.1 72.0 570 16.1 608 14.5 5.25 3,192 3.10 557 107 18.2 73.0 570 17.1 619 14.7 5.20 3,219 3.63 583 102 19.6 72.0 590 18.1 613 13.5 5.10 3,126 3.41 575 105 17.7 74.0 582 17.0 622 13.9 5.05 3,141 3.26 570 107 18.4 74.0 576 16.9 613 14.1 5.20 3,188 3.42 573 103 18.4 72.0 578 17.1 614 14.2 5.05 3,101 3.11 575 112 18.0 73.0 574 16.7 611 14.0 5.11 3,122 2.93 544 108 17.1 75.0 552 16.2 609 14.0 5.21 3,173 2.92 573 118 16.9 74.0 558 16.2 53 New Bedford — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 613 16.3 5.20 3,188 3.00 558 110 17.2 73.0 560 16.2 611 14.1 5.30 3,238 3.04 552 107 17.6 72.0 564 16.3 612 14.0 5.23 3,201 3.30 560 103 17.1 72.0 554 16.2 608 13.5 5.24 3,186 3.22 551 102 16.5 72.0 563 15.6 612 13.6 5.05 3,091 3.22 560 105 17.0 71.0 573 15.8 604 14.2 4.81 2,905 3.04 557 109 16.7 73.0 578 16.0 610 13.8 4.97 3,032 2.95 557 111 16.7 77.0 568 16.1 608 14.1 4.97 3,022 2.93 559 112 17.1 76.0 565 16.0 616 14.7 4.80 2,956 2.94 561 113 17.2 75.0 567 16.2 615 14.8 4.98 3,063 2.70 543 114 17.0 74.0 553 15.9 611 14.4 5.03 3,073 2.98 544 106 16.9 74.0 552 16.0 606 14.7 4.86 2,945 2.84 544 110 16.9 77.0 544 15.8 590 14.0 5.14 3,032 3.14 536 99 17.4 75.0 538 15.9 587 14.7 4.98 2,923 2.90 538 106 16.8 75.0 533 15,8 590 14.6 4.92 2,903 2.90 535 105 16.5 79.0 535 15.6 601 14.5 5.01 3,011 3.00 545 106 16.8 76.0 543 15.8 598 14.8 4.84 2,894 2.92 534 104 16.7 77.0 540 15.9 596 14.1 4.94 2,944 2.86 530 105 16.7 77.0 535 15.6 613 15.1 4.80 2,942 3.00 520 97 16.4 73.0 535 15.6 604 14.6 4.99 3,014 3.10 544 103 17.3 75.0 544 15.9 611 14.2 4.94 3,018 2.97 548 108 17.0 74.0 552 15.9 610 15.0 4.65 2,836 2.84 523 102 16.7 78.0 537 15.6 615 14.1 4.62 2,841 2.97 527 100 17.5 78.0 554 16.4 614 14.1 4.63 2,843 2.97 536 104 17.0 76.0 570 16.8 596 14.2 4.65 2,861 2.85 550 112 - 76.0 575 17.7 582 13.6 4.76 2,770 2.97 521 98 - 76.5 557 16.8 599 15.3 4.43 2,654 2.92 547 109 18.7 80.0 568 17.6 586 13.2 4.02 2,356 2.77 552 115 16.6 86.0 553 15.5 585 12.9 4.63 2,709 3.05 552 107 17.4 83.0 582 17.1 568 11.4 4.73 2,687 3.12 512 92 12.8 78.7 571 16.0 585 12.2 4.57 2,673 3.19 578 111 17.3 81.0 550 14.4 576 12.4 4.66 2,684 3.04 511 93 14.2 81.6 568 14.5 598 13.9 4.32 2,583 3.10 524 91 15.7 83.3 532 13.0 600 14.4 4.69 2,760 3.18 517 92 11.1 81.0 522 12.0 597 14.0 4.81 2,872 3.22 547 101 13.9 82.1 551 13.7 607 14.1 4.96 3,002 3.12 552 105 16.8 74.1 559 16.3 54 Old Colony. Water. Water. Water. Gallons. B. T. U. Factor. Gallons. B. T. U. Factor. Gallons. B. T. U. Factor. 2.82 557 115 2.80 528 105 2.50 514 110 2.90 544 108 2.80 524 • 104 2.70 526 108 2.70 528 110 2.90 528 104 2.40 519 116 2.60 532 113 2.50 524 114 2.40 522 117 2.66 530 110 2.40 527 117 2.40 510 111 2.80 528 105 2.80 528 106 2.50 516 110 2.70 530 113 2.90 533 105 2.50 513 109 2.60 523 109 2.80 534 108 2.50 514 110 2.70 523 110 2.80 528 104 2.30 514 117 2.60 522 109 2.80 527 105 2.40 520 116 2.30 509 115 2.90 526 100 2.50 515 110 2.70 510 102 2.80 528 105 3.00 500 91 2.90 517 99 2.60 533 102 2.50 512 109 2.90 544* 108 2.70 532 110 2.50 510 108 2.80 536 108 2.60 530 112 2.60 514 107 2.30 524 121 2.70 532 110 2.50 507 107 2.80 530 106 2.50 531 115 2.60 513 106 2.90 530 103 2.50 530 116 2.60 513 106 2.70 528 109 2.60 534 114 2.63 524 109 2.50 - - 2.50 530 116 2.80 522 103 2.50 523 113 Springfield. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 539 13.3 5.50 2,908 3.28 576 109 18.7 - 566 16.5 538 14.9 5.86 - 3.45 563 100 18.8 - - - 548 14.2 5.68 - 3.11 548 104 19.1 - 550 16.9 554 14.0 5.55 - 2.50 553 125 18.7 - 530 16.0 556 13.6 5.47 - 2.69 523 107 18.3 - 532 16.1 579 15.1 5.65 3,200 2.89 537 106 18.1 51.0 - 16.2 559 15.1 5.55 3,102 2.80 509 99 18.6 56.0 522 16.7 55 Springfield — Continued. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 547 14.5 5.51 3,013 2.85 505 96 17.6 55.0 520 14.8 565 14.3 5.39 3,045 3.24 545 100 18.5 53.0 513 15.6 538 13.9 5.64 3,034 2.76 505 98 18.2 52.9 518 15.5 549 14.1 5.47 3,003 3.09 507 88 17.9 53.1 513 15.4 533 14.2 5.46 2,910 3.53 533 90 19.0 53.0 519 15.3 542 14.7 5.33 2,887 3.23 523 93 19.0 53.5 524 15.6 545 14.9 5.32 2,897 3.08 536 101 19.2 51.0 519 14.9 555 15.1 5.24 2,908 2.95 542 106 18.9 52.0 519 15.5 550 14.8 5.40 2,969 3.20 542 100 18.8 52.8 515 15.2 549 13.5 5.47 3,002 3.22 593 115 17.8 50.8 517 13.8 535 13.0 5.26 2,814 3.19 536 98 18.1 57.7 520 14.2 544 14.3 5.49 2,983 3.01 531 101 18.3 56.5 522 15.3 553 14.8 5.52 3,050 3.16 541 100 18.3 60.8 533 15.9 554 14.6 5.10 2,825 3.32 548 99 18.6 64.1 560 14.7 557 13.8 5.03 2,801 3.05 577 111 19.2 61.8 521 14.6 535 13.4 5.16 2,761 3.09 527 97 18.8 63.2 518 14.5 520 12.9 5.11 2,654 3.12 553 105 19.0 61.6 515 14.4 537 14.0 5.03 2,702 3.32 548 91 18.9 57.5 526 15.0 512 11.9 5.19 2,657 3.40 547 97 18.8 43.1 521 14.6 563 14.3 5.09 2,865 3.12 575 112 19.1 51.4 531 15.0 560 14.2 5.22 2,923 3.27 567 106 18.5 52.7 527 15.5 532 13.9 4.97 2,644 2.89 543 108 18.8 53.5 528 15.7 549 13.9 5.07 2,782 3.12 540 101 18.7 52.4 550 15.3 541 13.2 5.12 2,769 3.00 550 107 18.8 62.3 524 14.3 541 13.2 4.86 2,629 3.15 540 100 18.1 60.4 521 14.6 525 8.4 5.63 2,955 3.29 535 100 18.2 56.9 518 13.9 519 7.0 5.58 2,896 2.95 533 103 18.2 55.7 520 14.0 505 7.5 5.81 2,934 3.04 524 98 17.8 54.7 519 13.8 508 7.0 5.75 2,911 3.14 533 98 18.5 55.8 520 14.2 505 7.1 5.68 2,868 3.18 539 99 19.3 57.9 520 14.5 - - 5.75 - 3.15 - - - 57.3 - - 497 6.9 6.17 3,056 3.06 538 98 18.7 60.0 529 14.9 505 7.4 5.72 2,888 3.02 521 97 18.1 56.1 532 14.2 530 8.3 5.73 3,036 3.12 534 99 18.4 61.2 531 14.4 501 7.0 5.93 3,024 3.31 529 93 18.4 59.0 528 14.7 518 8.9 5.85 3,030 3.19 533 97 18.9 62.0 529 15.2 56 Springfield — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. h 2 o. B.T.U. Candle Power. 518 7.4 5.55 2,874 3.10 541 102 19.5 68.0 528 15.5 517 7.6 5.13 2,652 3.14 534 98 19.4 69.0 525 16.2 - 7.0 5.21 - 3.20 - - 19.0 62.0 527 15.9 505 6.7 5.24 2,646 3.18 537 98 19.3 59.0 524 15.3 507 7.4 4.12 2,088 3.21 554 103 19.7 62.0 526 15.4 538 13.3 4.79 2,577 3.22 545 100 19.9 51.6 535 16.1 529 7.4 5.22 2,861 3.22 547 101 19.3 48.5 535 15.9 532 12.9 5.11 2,718 3.18 547 102 - 44.0 549 16.1 540 10.9 5.13 2,770 3.34 552 99 19.3 46.0 545 - - 14.8 4.83 - 3.16 - - 18.4 51.0 - 16.7 527 14.7 4.93 2,598 3.07 534 100 19.3 54.4 526 15.4 523 14.0 4.88 2.552 3.02 515 95 19.1 55.0 519 14.1 526 13.7 5.01 2,635 3.26 534 96 19.1 53.0 529 14.8 530 13.6 4.97 2,634 3.20 548 102 19.4 56.0 534 15.5 521 12.3 5.13 2,673 3.26 536 96 19.3 52.0 524 15.3 535 12.1 5.33 2,913 3.13 540 101 18.9 55.9 527 15.2 Suburban. Commercial. Commercial. Commercial. Commercial. B. T. U. Candle Power. B.T. U. Candle Power. B. T. U. Candle Power. B. T. U. Candle Power. 555 16.5 534 14.7 531 13.6 533 14.5 548 14.7 535 14.5 521 11.9 534 14.8 535 13.5 537 14.7 524 12.7 538 14.3 519 12.8 540 14.1 530 13.4 533 15.0 521 13.5 540 14.4 541 14.5 537 15.1 531 14.5 548 14.6 524 14.1 538 13.2 538 13.8 525 13.4 545 14.8 531 14.4 529 13.6 534 14.4 551 15.4 538 14.8 533 14.0 541 15.5 539 14.8 538 14.8 532 14.8 548 14.7 546 14.9 537 15.9 537 13.8 530 14.9 547 15.2 532 14.2 528 14.9 524 14.3 539 15.5 535 14.4 520 15.0 528 15.3 543 15.3 526 13.5 531 15.1 535 14.5 532 14.9 535 - 534 14.3 57 Taunton. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 623 14.5 4.85 3,021 - - - - - - - 620 15.4 4.82 2,990 - - - - - - - 613 14.4 5.05 3,093 - - - - - - - 598 13.1 5.10 3,050 - - - - - - - 619 14.3 4.79 2,964 - - - - - - - 616 14.8 4.72 2,908 - - - - - - - 605 13.9 5.08 3,073 - - - - - - - 609 13.6 5.19 3,161 - - - - - - - 616 13.5 4.85 2,988 - - - - - - - 603 13.5 4.77 2,878 - - - - - - - 602 13.3 4.85 2,923 - - - - - - 615 13.8 4.76 2,926 - - - - - - 613i 14.51 4.86 2,978 3.09 - - - 4.7 613 14.5 627i 14.31 4.92 3,084 4.10 - - - 0.9 627 14.3 - - 5.01 - - - - - 7.4 598 13.9 5731 13.2i 5.17 2,962 2.92 - - - 2.0 573 13.2 5951 13.1» 4.64 2,762 - - »- - 0.0 595 13.1 603i 13.4 4.68 2,823 - - - - 0.0 603 13.4 604i 12.9 4.80 2,899 - - - - 0.0 604 12.9 612 13.4 4.85 2,967 - - - - 0.0 612 13.4 629 14.7 4.85 3,052 - - - - - - - 586 12.4 4.71 2,759 - - - - - - - 605 12.8 4.67 2,825 - - - - - - - 624 14.7 4.78 2,984 - - - - - - - 617 - 4.82 2,974 - - - - - - - 618 13.6 4.67 2,885 - - - - - - - 616 14.0 4.86 2,994 - - - - - - - 625 13.1 4.73 2,958 - - - - - - - 605 13.8 5.06 3,059 - - - - - - - 623 14.7 4.88 3,042 - - - - - - 635 14.6 4.77 3,027 - - - - - - _ 621 14.5 5.00 3,104 - - - - - - - 609 13.5 5.18 3,153 - - - - - - _ 608 14.5 4.99 3,039 - - - - - - _ 601 14.3 5.14 3,087 - - - - - - - 1 Returns of Btu and candle power are for commercial gas. 58 Taunton — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 612 15.3 5.10 3,122 - - - - - - - 621 14.9 4.94 3,070 - - - - - - - 618 15.0 4.65 2,876 - - - - - - - 620 15.0 4.75 2,943 - - - - - - - 602 13.8 4.87 2,932 - - - - - - - 599 13.9 4.92 2,948 - - - - - - - 579 13.8 4.92 2,847 - - - - - - - 611 13.0 5.07 3,097 - - - - - - - 594 12.0 5.05 2,999 - - - - - - - 610 13.6 4.89 2,980 - - - - - - - Worcester. 547 12.9 5.76 3,148 3.27 606 117 19.2 41.6 545 17.0 563 13.7 5.33 3,001 3.73 561 94 18.5 47.0 555 16.2 565 15.8 5.39 3,046 3.34 565 103 18.6 50.0 565 17.0 521 14.2 5.53 2,877 3.70 573 98 19.5 49.8 559 16.7 559 14.1 5.42 3,027 3.41 559 100 19.0 51.8 568 16.5 526 12.1 5.46 2,874 3.47 575 103 19.8 50.0 542 15.9 540 11.9 5.20 2,806 3.67 650 119 20.7 53.0 549 15.9 577 12.3 5.17 2,992 4.11 609 99 19.8 54.2 566 17.9 543 - 5.82 3,163 3.83 611 105 19.8 50.6 562 16.8 602 15.2 4.97 2,991 3.97 650 112 - 38.2 589 17.9 532 12.1 5.57 2,962 4.03 615 103 - 42.7 526 17.1 528 12.5 - - 4.11 - - - 39.6 562 15.9 - 13.5 5.14 - 4.19 - - - 44.9 584 16.5 563 12.9 4.78 2,688 5.09 640 91 23.4 52.2 580 15.2 555 10.6 5.44 2,999 4.47 645 101 23.0 46.1 579 15.2 534 10.9 4.90 2,615 4.15 639 106 - 40.1 580 15.3 - - 5.45 - 4.13 - - - 46.0 551 15.6 586 11.1 5.27 - 4.46 671 107 - 45.5 575 15.5 523 10.9 5.32 2,781 4.11 622 103 - 50.7 561 14.7 499 10.1 5.89 2,695 3.79 609 106 24.1 49.0 542 14.6 474 9.4 5.73 2,713 4.35 616 97 24.1 49.1 533 14.4 524 11.4 4.93 2,591 4.60 640 98 23.3 48.0 573 15.6 444 10.5 5.16 2,293 4.12 620 102 23.3 49.1 538 15.4 413 10.9 5.14 2,122 4.00 608 110 24.0 42.6 537 13.4 59 Worcester — Concluded. Coal. Water. Commercial. B.T.U. Candle Power. Yield. B.T.U. Feet. Gals. B.T.U. Factor. Candle Power. Per Cent. H 2 0. B.T.U. Candle Power. 523 11.2 5.09 2,662 4.21 632 103 23.8 37.1 561 15.2 524 9.1 4.89 2,721 4.36 632 100 22.5 43.7 555 14.9 594 12.4 4.74 2,817 3.85 628 109 21.6 42.7 580 16.0 510 11.5 4.39 2,241 3.70 626 112 21.1 48.0 556 15.9 519 9.3 5.02 2,608 4.19 644 106 19.2 38.2 552 14.7 488 12.5 5.05 2,463 3.84 618 107 23.8 29.6 552 15.0 537 11.5 4.92 2,642 4.04 611 101 22.3 38.4 561 15.3 479 12.3 4.85 2,323 3.74 613 108 23.6 34.2 561 14.9 508 10.1 4.97 2,524 3.90 620 106 23.2 31.0 561 14.4 545 12.2 4.65 2,536 3.85 627 109 24.6 39.7 563 14.9 541 12.1 5.11 2,764 3.96 632 108 27.1 33.2 561 14.4 •531 11.9 5.11 2,714 4.42 615 95 23.7 29.8 549 13.9 521 12.4 5.17 2,693 4.09 617 102 22.8 37.5 567 13.9 584 14.4 5.69 3,320 3.15 595 118 22.2 60.2 560 16.1 507 13.4 5.69 2,886 3.04 522 97 20.0 59.2 539 14.9 580 12.9 5.66 3,281 3.00 570 114 19.2 64.5 555 15.1 546 12.7 5.70 3,214 2.75 542 112 17.3 56.9 551 15.5 559 12.2 5.59 3,125 2.54 524 112 15.9 65.3 536 15.3 561 11.8 5-. 60 3,139 2.90 535 105 15.6 57.3 537 14.1 561 12.2 5.79 3,245 2.70 515 104 15.4 61.6 530 15.3 566 12.1 5.70 3,226 3.05 556 105 16.1 55.3 539 15.6 545 12.8 5.54 3,016, 2.81 538 107 17.7 57.7 543 15.1 549 12.2 5.52 3,029 2.84 533 106 19.1 54.7 540 12.5 561 12.6 5.51 3,092 2.34 498 110 13.4 33.6 559 14.7 567 12.5 5.53 3,135 2.37 481 100 8.6 39.9 535 14.4 573 14.1 5.45 3,107 1.88 479 122 9.9 38.0 536 14.4 559 11.8 5.46 3,054 2.95 495 90 13.8 36.0 536 14.4 556 12.2 5.42 3,015 2.47 495 103 10.4 37.2 540 13.3 521 12.2 5.45 2,842 2.69 505 100 13.7 42.9 535 12.9 551 12.9 5.52 3,042 2.56 489 98 12.3 41.1 538 12.4 559 10.4 5.34 2,986 2.62 494 109 11.2 41.9 553 14.4 561 10.6 5.51 3,093 2.52 493 101 10.8 47.9 539 12.6 541 10.1 5.59 3,026 3.15 532 98 16.0 50.8 540 14.1 571 10.5 5.57 3,178 3.19 546 101 - 49.2 557 14.9 555 9.2 5.57 3,089 2.87 528 104 15.4 48.5 543 15.0 571 9.8 5.54 3,165 2.94 545 107 15.4 52.1 550 14.9 540 11.9 5.32 2,882 3.52 579 104 16.0 46.1 553 15.0 60 State Inspections. State Tests. Companies’ Tests for Week, including Date of State Test. Company. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Attleboro, .... Oct. 25 603 605 - - - Nov. 15 619 607 627 590 - Dec. 5 612 611 - - - Dec. 27 609 611 - - - Jan. 16 613 607 617 598 - Feb. 20 605 604 616 597 - Mar. 21 629 626 632 617 - Apr. 24 616 621 633 609 - Aug. 2 630 622 631 597 - Boston, .... Aug. 1 602 595 - - 590 Aug. 7 586 581 - - 588 Aug. 16 584 585 - - 592 Aug. 23 592 582 593 571 576 Aug. 30 561 564 - - 565 Sept. 20 563 564 - - 558 Sept. 26 569 576 585 569 559 Oct. 13 565 576 592 564 558 Oct. 27 577 583 - 573 Nov. 4 587 584 - - .578 Nov. 21 595 595 - - 590 Dec. 5 596 594 - - 580 Dec. 21 585 584 - - 582 Jan. 9 574 572 581 558 566 Jan. 18 581 581 590 574 570 Feb. 1 573 573 581 559 566 Mar. 3 570 572 576 566 575 Mar. 18 578 578 584 571 576 Mar. 25 566 568 572 564 575 Apr. 18 591 582 585 579 575 Apr. 25 583 ' 584 593 575 581 May 1 585 589 599 583 592 May 15 619 586 597 576 580 June 12 583 589 596 582 587 June 27 597 593 597 586 597 July 6 600 599 602 595 595 61 State Inspections — Continued. Company. State Tests. Companies’ Tests fob Week, including Date of State Test. • Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Boston— Con. . July 25 590 589 598 583 584 Aug. 17 569 571 576 568 569 Sept. 14 559 559 568 554 558 Sept. 21 570 564 571 556 564 Brockton, .... Aug. 31 558 567 591 556 - Sept. 21 563 565 - - 570 Oct. 11 547 553 - - 567 Nov. 1 549 555 561 547 569 Nov. 10 560 553 - - 575 Nov. 28 553 559 - - 577 Dec. 15 553 559 - - 573 Jan. 23 543 542 545 538 558 Feb. 27 555 548 555 543 565 Mar. 28 567 565 571 554 582 Apr. 25 553 551 556 546 571 July 5 550 550 554 546 569 July 31 550 550 555 542 577 Cambridge, Aug. 5 567 570 - - 576 Aug. 11 560 566 588 560 572 Aug. 16 561 555 - - 560 Sept. 16 552 558 - - 560 Sept. 22 560 559 - - 568 Oct. 11 554 556 - - 561 Nov. 1 569 569 - - 566 Nov. 11 582 577 - - 577 Nov. 17 583 581 - - 577 Nov. 23 576 587 591 581 591 Dec. 6 596 592 - - 590 Dec. 30 579 575 - - 577 Jan. 5 572 579 584 574 577 Jan. 20 575 576 587 568 570 Feb. 6 567 574 577 570 578 Mar. 13 578 572 578 564 568 Apr. 20 577 569 577 563 564 July 28 553 562 563 560 564 Sept. 28 558 556 558 552 557 62 Company. Charlestown, East Boston, Fall River, State Inspections — Continued. State Tests. Companies’ Tests for Week, including Date of State Test. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Feb. 27 571 612 - - - Mar. 6 630 617 - - - Apr. 7 613 619 - - - Apr. 17 611 621 - - - May 1 602 615 - - - June 13 600 606 - - - Sept. 29 609 609 615 602 - Oct, 30 559 548 562 532 - Nov. 8 539 548 556 528 - Nov. 14 535 542 - - - Dec. 1 537 534 - - - Dec. 21 546 535 550 524 - Jan. 5 527 542 571 526 - Jan. 24 530 527 532 519 - Feb. 17 526 526 539 513 - Mar. 25 543 536 545 524 - Apr. 18 519 527 537 521 - Apr. 26 510 515 534 508 - June 12 520 523 580 486 - June 25 499 - - - - July 7 532 534 544 522 - July 25 526 543 558 526 - Sept. 14 522 529 536 522 - July 31 570 548 558 538 561 Aug. 11 556 554 - - 552 Sept. 21 548 553 - - 555 Oct. 18 549 560 569 545 557 Oct. 31 574 563 566 557 554 Nov. 10 557 556 - - 556 Nov. 16 570 562 570 558 554 Nov. 29 567 556 565 549 553 Dec. 15 545 547 - - 548 Dec. 29 557 554 - - 548 Jan. 12 566 559 565 550 555 Jan. 23 568 560 566 554 556 63 State Inspections — Continued. Company. State Tests. Companies’ Tests for Week, : Date of State Test. INCLUDING Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Fall River — Con. Feb. 7 562 561 569 551 564 Feb. 23 566 563 566 557 565 Mar. 20 555 548 553 541 438 Mar. 28 561 552 561 546 539 May 2 540 535 542 522 - July 11 551 557 562 546 542 Sept. 26 540 542 556 532 536 Fitchburg, Aug. 7 571 551 582 522 539 Aug. 23 559 532 542 523 547 Sept. 16 540 550 565 530 560 Oct. 10 522 536 546 523 534 Oct. 16 519 532 541 523 533 Nov. 7 538 531 - - 532 Nov. 22 565 558 572 533 571 Dec. 13 566 564 - - 568 Dec. 21 563 561 - - 577 Jan. 26 568 553 567 547 561 Feb. 13 560 561 573 551 555 Apr. 17 550 549 556 538 542 June 9 537 540 547 523 540 Aug. 8 552 548 559 536 545 Haverhill, .... Aug. 18 564 559 573 550 - Sept. 15 549 547 - - - Sept. 27 567 551 557 541 - Oct. 23 562 559 - - - Nov. 9 570 565 - - 557 Nov. 23 566 563 - - 554 Dec. 28 557 555 - - 536 Jan. 25 549 546 554 534 546 Mar. 2 558 551 559 545 544 Mar. 14 548 547 554 538 - Apr. 26 555 552 554 546 - July 27 540 535 544 530 - Sept. 13 543 _i - - - 1 No tests made. 64 State Inspections •— Continued. Company. State Tests. Companies’ Tests for Week, including Date of State Test. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Holyoke. Aug. 11 545 571 598 552 - Aug. 17 578 579 - - - Aug. 24 600 - - - - Sept. 19 608 - - - - Nov. 16 577 - - - - Dec. 6 565 581 605 568 - Dec. 30 577 - - - - Jan. 12 568- - 623 1 586 1 601 May 17 560 544 560 501 560 June 8 556 577 600 549 591 Aug. 30 580 577 576 566 - Lowell, .... Sept. 15 589 588 - - 589 Oct. 23 594 595 - - 597 Nov. 7 595 600 602 598 602 Nov. 22 570 604 607 602 603 Dec. 12 579 583 - - 575 Dec. 29 556 579 583 581 577 Jan. 19 588 588 591 586 585 Jan. 30 582 577 585 569 580 Mar. 2 568 573 578 568 570 Apr. 24 580 585 588 583 571 June 15 575 586 590 582 571 July 24 593 594 610 583 586 Aug. 30 583 582 582 578 - Sept. 11 574 573 573 573 573 Lynn, .... Sept. 8 577 578 - - 575 Sept. 19 570 565 575 556 550 Sept. 27 569 566 - - 567 Oct. 3 567 - - - 560 Oct. 17 550 549 - - 547 Oct. 31 544 549 572 537 544 Nov. 14 562 566 577 561 573 Dec. 1 577 564 572 560 574 Dec. 28 571 560 566 544 574 1 Taken at works station. 65 State Inspections — Continued. Company. State Tests. Companies’ Tests for Week, including Date of State Test. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Lynn— Con. Jan. 10 560 553 557 548 570 Jan. 31 571 560 562 558 565 Mar. 1 560 550 560 537 559 Mar. 14 570 568 573 560 573 Apr. 17 550 557 560 552 558 May 3 555 552 556 . 548 554 June 13 539 536 J 538 535 541 July 26 545 540 544 536 535 Sept. 21 547 539 542 533 546 Malden, .... Aug. 18 557 - - - 560 Aug. 24 542 - - - 564 Sept. 9 535 - - - 544 Sept. 20 526 533 542 519 534 Oct. 3 528 533 - - ' 532 Oct. 5 537 545 561 537 532 Oct. 30 544 546 - - 543 Nov. 14 552 547 553 544 540 Nov. 23 534 538 - - 536 Dec. 21 534 542 561 533 540 Jan. 9 557 548 551 539 544 Mar. 2 539 531 541 519 536 Mar. 24 546 543 550 532 550 Apr. 20 538 531 539 516 530 May 5 541 544 553 534 544 July 27 537 533 537 530 535 Aug. 31 529 532 546 526 531 New Bedford, . Aug. 16 590 578 591 565 597 Aug. 25 567 560 568 552 578 Sept. 22 568 558 570 547 587 Oct. 25 567 569 - - - Oct. 31 551 554 - - - Nov. 16 565 556 563 546 - Nov. 29 576 570 578 557 576 Dec. 14 586 590 594 571 596 Dec. 29 573 578 - - 589 66 State Inspections — Continued. Company. State Tests. Companies’ Tests for Week, Date of State Test. INCLUDING Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. New Bedford — Con.. Jan. 12 533 552 577 534 561 Jan. 25 568 560 565 551 570 Feb. 25 569 563 574 552 566 Mar. 20 571 565 567 563 570 May 2 543 544 558 535 558 July 11 543 565 578 558 570 Sept. 26 545 552 562 542 551 Old Colony, July 29 567 557 563 536 - Aug. 9 547 544 - - - Sept. 9 536 528 538 518 - Sept. 13 551 530 544 516 - Oct. 13 509 509 - - - Oct. 24 515 518 - - - Nov. 16 523 534 - 517 - Nov. 28 519 530 543 518 - Dec. 29 521 529 529 514 - Jan. 10 528 - 538 515 527 Mar. 13 524 - - - 526 Sept. 6 513 514 525 507 - Springfield, Aug. 16 548 550 - - 555 Aug. 25 538 530 - - 559 Sept. 20 517 520 - - 538 Oct. 18 536 519 521 516 533 Nov. 17 524 515 516 514 531 Dec. 7 521 522 - - 524 Dec. 29 523 - - - - Jan. 23 535 526 531 514 531 Feb. 23 530 528 539 521 543 Mar. 8 522 524 532 515 545 Mar. 16 519 521 528 515 534 Mar. 23 523 518 527 510 524 Apr. 18 532 520 523 518 520 Apr. 25 534 - - - - May 17 522 528 537 520 522 June 8 534 529 534 519 524 67 State Inspections — Continued. Company. State Tests. Companies’ Tests for Week, including Date of State Test. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Springfield — Con. July 19 546 537 540 531 535 Aug. 10 524 530 562 512 545 Sept. 5 501 515 526 504 519 Suburban, Aug. 30 553 555 - - - Sept. 19 526 519 529 514 - Oct. 17 532 538 - - - Nov. 21 529 528 - - - Jan. 18 545 540 544 534 - Mar. 23 541 531 541 524 - Sept. 28 529 532 537 528 - Taunton, .... Stept. 22 619 - - - - Oct. 18 617 620 - - - Oct. 25 616 613 - - - Nov. 28 609 609 - - - Dec. 27 625 615 621 605 - Feb. 27 607 595 ' 605 583 - Mar. 4 607 595 605 583 - Apr. 25 654 624 649 615 - July 5 642 608 622 598 - Aug. 3 627 618 633 603 - Sept. 18 625 611 623 597 - Worcester, .... July 21 563 - - - - Aug. 2 552 545 555 531 545 Aug. 11 551 555 - - 575 Aug. 16 567 565 - - 584 Aug. 25 559 559 - - 569 Sept. 20 564 - - - - Oct. 10 606 589 623 550 617 Oct. 27 577 562 578 509 575 Nov. 3 541 584 598 568 - Nov. 17 588 575 588 557 589 Dec. 14 548 561 591 543 571 Dec. 29 529 533 - - 548 Jan. 11 539 538 548 531 548 Jan. 23 567 561 573 555 571 68 State Inspections — Concluded. Company. State Tests. Companies’ Tests for Week, including Date of State Test. Date. B. T. U. Test Station, Average. Maxi¬ mum. Mini¬ mum. Works, Average. Worcester— Con. Feb. 25 520 552 579 523 558 Mar. 16 552 554 . 567 546 561 Apr. 23 574 560 582 542 575 May 4 544 539 548 529 540 May 17 555 551 559 543 554 June 21 545 539 555 525 557 July 19 541 540 547 - 536 Sept. 5 528 537 547 526 540 Sept. 10 565 550 560 543 557 Sept. 18 550 547 558 542 543 70 iilpilS m i ft Ii JIX'TCT 1 l m tB =P Till ftfftpijf 11 ; 1§1 ]4g ft] 1 rffi t|:|| Irl n ill MM pp P i|i/ jjPl# ftp if 1. p: m ■ P IS 1 4 ii 1 f.Hi Pp ;±:ffi±Si±i± IjSfti liftjLffl nil HI ■4M Iff # iii Iff | ft iftiPi: :::: 5 ft+P II 4 ■Mi r 141 h 444 PSi ffftftft : : P 1 + ftp m Imm XtffftBf ii ii I 1 j:jj:j mm jpft :p ii P w 15ft (:! If:;: pp mpjp ::::ft:::f f:f mm -Pllli iiin fjjttftf iir*. :: Hi" * ill ftt Mm |flf IIP gill!! pPiij j± if ; •; ftft fHr 11 ■ Pftft i l -- 4 hPe mmm Efill lljgljl hppp 111 mm nimt H pip It Pffl ftp :p EtHi wTrir PP |:1 TTlT 1 P ftft W 1 PP 11 11 ftft Si ft H in sflpp pgggfS II PiPiM EffipSftfffl 1111 lit - ftft'plr ## pp ill PP PP Up i 1 1 I II il jsE 3 |PPg: ■ll II ■m fi III ill 1 piatm p 1111 PBPP llPllii : -Hit tttt 11 ii ■ 111 PpSffi Ii P m P p ffi 1 lift: t ft" IBSif; lllli Ti ' TtT TiftTflt tip J+H= ±:3 1:1 ftp mmm p P PI" 1! ■if] llilWK PPPSeI tHtfnT 11 tf~T 'PP 1:1 ppp p P if:! mw4 II ESStftSp PPPf ft mm ■TTrrrrr pp ptrHtt plffi 6ft ftft ftft 11 t i±4 : ilpl T nr ?! K IB Pti mm .-,. ...i mm ppp ftft p P EftjSjftiP, 1111 : /Np PP mm ip PP p . ::: ftft. p ft IftipP 1! 11 ffigglg sftpiEfSl iftXftft fftlffiBi m ftft ftft ft tf Jill {rtr e * !ft: ii ftPPp IBBB PPPP ■Mm PP PPP 44-fr TTTT MM -i * r- p ft ftf IpI ■ ff 11111 il m±±n± ftftiftt MSS in ft# ftp IP i ftft PB ps tip* 1111 111 I II mm? ii P ii p ii pi pgjjp PjPplj] Stjffi mm Pff 11 P i II ml If Pf! ip 11 3 x 3i t]3 m II PP : 1 ‘ 7; •; imm -H+h ±H PB ftft |p : : ipi is 11 ft 1; fii- M ftS . 1-1-4-1 xj-j-f- ml liii SSSSp jjjjil 4 - H-jf Pi Pill 1111 . 44ff 4-fff Sfl pfff M 11 fflf TtPFH 33 ip Si iizt iiiJirn: pit 1111 3mj |EH tE IE 1# ftF P S mm MH & H i V il El miff 111: ft ftft ftft ftft -■l-LUl {III {Jjl iliPi ill i SlillB il f-ftp ¥ P H:i. iPP f n ±5 f ini : :.: Pff 4;; :: P : ft ipyp ffppp pp!! jl§l II Pgft ii p|-iP s ftft Bff i§pp :f ppp =fil I Isill II Ip fii Bp tm m :TOffl ^ ffrjxmi: iili: 72 73 74 Appendix H. Burner Tests. The following are tables, with their averages, showing varia¬ tions' in open burner candle powers compared with results ob¬ tained in official tests with Suggs’ Argand burners of suitable size (D, E and F) and appropriate chimney (If" x 6" and If" x 7"):— Table A. — Water Gas, 1910. Argand. Open. Argand. Open. Argand. Open. 20.82 20.28 21.40 21.30 20.27 20.66 20.40 20.82 20.66 21.55 19.30 17.21 18.30 13.66 20.55 20.47 17.60 15.40 20.89 23.23 20.44 16.61 14.61 10.53 20.48 19.15 19.72 19.64 20.94 20.25 18.33 17.84 20.10 17.98 20.65 19.34 20.80 19.40 19.95 19.78 20.74 19.02 19.59 18.58 20.70 18.80 19.84 19.51 Table B. — Water Gas, 1912. 19.58 22.20 18.97 20.41 20.46 20.82 20.22 22.02 18.94 22.52 19.03 23.68 20.63 20.71 21.92 22.01 19.83 20.15 19.47 19.81 20.10 23.40 20.06 21.76 19.89 21.50 21.75 23.66 Table C. — Water Gas, 1912. 20.51 18.55 20.81 19.18 18.05 16.34 23.16 16.45 18.00 17.40 20.17 19.55 22.16 21.64 18.50 17.31 24.36 22.14 19.67 17.90 20.42 18.77 19.26 19.03 21.56 19.52 20.31 19.12 20.42 18.64 21.74 20.33 20.17 16.43 19.73 19.03 18.99 16.75 75 Table D. — Coal Gas, 1910. Argand. Open. Argand. Open. Argand. Open. 17.09 16.24 14.50 11.54 16.94 13.28 17.42 16.75 16.09 14.50 16.10 13.50 16.54 13.16 16.88 16.01 15.90 14.00 16.49 12.19 • 16.21 15.64 16.63 15.31 17.21 15.14 17.08 16.25 17.35 14.40 16.90 15.20 17.13 15.13 16.68 16.21 16.27 13.52 17.36 15.18 17.11 15.76 15.86 14.99 16.76 15.47 16.39 14.18 16.69 13.09 17.03 16.43 16.71 14.56 16.78 15.20 17.18 15.29 16.43 14.89 Table E. — Coal Gas, 1912. 16.91 14.80 16.66 14.77 17.47 13.27 17.12 16.20 16.60 15.82 16.79, 13.32 16.77 15.13 16.14 13.90 16.76 14.53 15.86 14.74 17.26 13.33 Table F. — Mixed Gas, 1910. 17.90 15.61 18.62 16.98 18.70 17.41 17.43 16.06 17.10 17.60 19.01 19.35 18.10 16.60 18.51 17.03 19.10 18.56 17.09 16.35 16.58 17.00 18.43 15.09 18.33 15.87 17.11 17.83 19.17 18.59 18.00 15.78 17.16 16.80 18.30 15.90 17.18 14.87 18.32 16.80 17.77 14.60 18.32 19.22 18.27 16.79 16.39 13.69 17.10 13.10 16.61 16.92 16.11 11.65 17.65 16.84 17.64 15.50 16.19 13.97 18.10 16.60 17.60 14.50 18.80 18.60 17.69 15.08 18.20 16.31 17.20 14.26 17.62 17.29 18.02 16.86 17.98 16.03 17.78 16.64 17.70 16.40 18.20 15.56 18.10 17.31 16.66 15.92 17.87 18.00 18.62 15.58 17.88 17.32 17.90 17.00 17.76 14.40 16.83 12.82 17.85 16.35 17.44 16.23 19.06 18.26 18.19 15.22 19.13 18.87 76 Table G. — Mixed Gas, 1912. Argand. Open. Argand. Open. Argand. Open. 17.43 16.43 18.63 16.62 16.22 12.51 18.17 17.63 18.53 16.49 16.24 13.24 16.62 15.82 16.19 12.10 17.83 16.10 16.37 15.55 19.65 18.68 • 17.45 14.31 17.24 17.07 17.14 15.41 18.05 18.02 18.40 17.13 19.70 17.09 18.43 18.24 18.03 16.03 18.24 14.07 17.75 15.68 18.31 16.25 17.43 13.09 Table H . —Plants not under Heat Unit Basis for Year ending 1916. Coal Gas. Water Gas. Mixed Gas. Argand. Open. Argand. Open. Argand. Open. 16.4 13.3 16.9 8.5 17.8 14.1 16.5 11.2 18.2 10.8 16.3 10.7 14.8 11.1 16.1 8.8 16.6 9.8 16.4 14.5 14.5 8.4 16.5 13.9 16.5 13.4 17.5 11.1 16.0 13.2 16.8 10.5 16.9 12.0 18.2 12.4 16.6 10.5 16.9 10.4 18.3 10.9 15.6 12.9 16.5 9.3 16.2 11.8 15.2 11.1 15.2 8.5 16.2 9.2 16.2 14.2 18.8 9.9 16.1 11.8 . 16.10 12.27 16.1 8.0 16.6 14.4 16.1 8.1 17.2 14.9 16.8 9.48 16.83 12.25 Table I. — Plants under Heat Unit Basis, 1916. Water Gas. Coal Gas. B.T. U. Argand. Open. b. t. u. Argand. Open. 522.6 14.5 7.9 609.3 13.8 9.2 518.8 12.5 5.3 612.0 16.3 13.1 566.3 16.4 12.1 603.4 16.4 11.8 535.9 14.47 8.43 608.2 15.50 11.37 77 Table I — Concluded. Mixed Gas. Mixed Gas. B. T. TJ. Argand. Open. B. T. U. Argand. Open. 596.2 17.2 10.6 566.0 14.5 8.9 553.2 13.7 8.1 577.1 16.0 13.8 553.0 12.4 7.9 565.0 15.4 12.8 581.9 15.2 10.3 579.0 14.7 11.5 582.5 15.1 13.4 569.8 15.9 13.0 576.2 15.6 11.1 551.9 15.0 8.6 596.1 16.7 12.4 534.1 14.4 8.8 535.1 14.3 7.1 585.8 18.9 9.7 570.4 14.5 8.2 524.1 13.5 7.0 567.0 14.2 10.0 520.8 15.7 10.6 545.0 14.1 8.8 588.0 16.5 11.3 556.9 14.6 9.5 548.0 14.5 10.0 565.3 14.3 9.7 563.9 15.08 10.12 * t