HANDY TABLES FOR ELECTRICAL AND STEAM ENGINEERS Copyright 1901 by American Electrician Company PRICE, 50 CENTS NEW YORK AMERICAN ELECTRICIAN COMPANY X90X # # ^taming mib |Tabor. LIBRARY University of Illinois. CLASS. BOOK. VOLUME . 'p ■a.Yvy Accession No. # OsS2S2s^522g2S82^2 t©=^$= !S=i#-5g2^SS=^=^:^=S330 INTRODUCTORY. Tables of any kind are useful in arriving at approximate results without extensive calculation, but a user of tables should constantly bear in mind the fact that some results must be only approximate because it is not practicable to construct a table that will cover every possible case or contain all practical factor values. To illustrate — Table III is absolutely accurate as to the factor values given, but it will not serve to find the current taken by a motor of 83 per cent efficiency. This value can be approximated by taking a figure midway between the current at 82 and that at 84 per cent. Again, the table is not accurate, of course, for 115-volt and 230- volt motors; but it can be used as a guide without serious error. Most of the tables contained in this pamphlet are constructed on the ordinary plan of giving three sets of interdependent fac- tor values, so that by assuming any two the other one may be found. Table XII is made on a slightly different plan, and embraces four factors — cylinder diameter, horse-power, mean- effective pressure and stroke X r.p.m. The composite factor, stroke X r.p.m., corresponds in character, but not in value, to piston speed; it is employed because it is much less trouble to multiply the stroke by the revolutions than it is to calculate piston speed in feet per minute. The method of using the table is indicated in the footnotes. REf 6 n A Table I. Copper Wires for Electric Light and Power Circuits. Pounds per 1000 ft. Ohms per 1000 feet P -S o3-_o* at different tem- r r ^s) W ^ E-t peratures, Fah- renheit. 60° 110-volt constants.* For computing 1 load or distance at 75° F. corresponding to dif- ferent line losses.! 1% 1 y 2 % 2% 2y 2 % 3% Maximum current. ££ ■ag-? (§i£’ a ^ 540 340 215 810 510 320 1,080 680 430 1,350 850 535 1,620 1,020 645 fttriwS f?n» V* % % % 1 1% 2 2% 3 4 5 7% 10 0 HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP- O) 220- Volt Motors. 6 V 2 % 1 i y 2 2 3 4 5 6 7% 10 15 20 HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. HP. 60 2.83 4.24 5.65 8.47 11.3 16.95 22.6 28.25 33.9 42.38 56.51 84.77 113. 62 2.73 4.1 5.47 8.2 10.94 16.41 21.87 27.35 32.81 41.02 54.69 82.04 109.38 64 2.65 3.97 5.3 7.95 10.6 15.89 21.19 26.49 31.79 39.73 52.98 79.47 105.95 66 2.57 3.85 5.14 7.7 10.27 15.41 20.55 25.69 30.83 38.53 51.38 77.07 102.75 68 2.49 3.74 4.98 7.48 9.97 14.96 19.95 24.93 29.92 37.40 49.87 74.8 99.73 70 2.42 3.63 4.84 7.27 9.69 14.53 19.38 24.22 29.06 36.33 48.44 72.66 96.88 72 2.35 3.53 4.71 7.06 9.42 14.13 18.84 23.55 28.26 35.32 47.1 70.64 94.19 74 2.29 3.44 4.58 6.87 9.16 13.75 18.33 22.91 27.49 34.37 45.82 68.73 91.64 75 2.26 3.39 4.52 6.78 9.04 13.56 18 08 22.61 27.13 33.91 45.21 67.82 90.42 76 2.23 3.35 4.46 6.69 8.92 13.38 17.85 22.31 26.77 33.46 44.62 66.92 89.23 78 2.17 3.26 4.35 6.52 8.69 13.04 17.39 21.74 26.08 32.60 43.47 65.21 86.95 80 2.12 3.18 4.24 6.36 8.48 12.72 16.95 21.19 25.43 31.79 42.39 63.58 84.77 82 .... 3.1 4.13 6.2 8.27 12.41 16.54 20.68 24. SI 31.02 41.35 62.03 82.70 84 .... 3.03 4.04 6.05 8.07 12.11 16.15 20.18 24.22 30.27 40.37 60.55 80.74 85 • • • • 2.99 3.99 5.98 7.98 11.97 15.96 19.95 23.94 29.92 39.89 59.84 79.73 86 • • - . 3.94 5.91 7.88 11.83 15.77 19.72 23.66 29.57 39.43 59.14 78.86 88 .... 3.85 5.78 7.7 11.56 15.41 19.27 23.12 28.9 38.53 57.8 77.07 90 3.77 5.65 7.53 11.30 15.07 18.84 22.6 28.26 37.68 56.56 75.35 91 11.18 14.9 18.63 22.36 27.95 37.26 55.89 74.52 92 11.06 14.74 18.43 22.11 27.64 36.86 55.29 73.72 93 .... 10.94 14.58 18.23 21.88 27.35 36.46 54.69 72.92 The heavy figures indicate the current taken by motors of average efficiency. When there are two in one column, the upper figure refers to 110-volt motors and the lower one to 220-volt machines. Table IV. — Current Required by 500-Volt Direct-Current Motors. ■ H § o 1 HP. iy 2 HP. 2 HP. 3 HP. 5 HP. 7V 2 HP 10 HP. 15 HP. 20 HP. 25 HP. 30 HP. 60 2.49 3.73 4.97 7.46 12.43 18.65 24.87 37.3 49.74 62.17 74.60 62 2.41 3.61 4. SI 7.22 12.03 18.05 24.07 36.1 48.13 60.16 72.2 64 2.33 3.5 4.66 6.99 11.66 17.47 23.31 34.97 46.63 58.28 69.94 66 2.26 3.39 4.52 6.77 11.29 16.93 22.58 33.86 45.15 56.44 67.73 68 2.19 3.29 4.39 6.58 10.97 16.46 21.94 32.92 43.88 54.86 65.83 70 2.13 3.2 4.26 6.39 10.66 15.98 21.31 31.97 42.63 53.28 63.95 72 2.07 3.11 4.14 6.22 10.36 15.54 20.72 31.08 41.45 51.8 62.17 74 2.02 3.02 4.03 6.05 10.08 15.13 20.16 30.24 40.33 50.14 60.49 75 1.99 2.98 3.98 5.97 9.95 14.92 19.89 29.84 39.79 49.73 59.68 76 1.96 2.94 3.93 5.89 9.82 14.72 19.63 29.45 39.26 49.08 58.9 73 1.91 2.87 3.83 5.74 9.56 14.35 19.13 28.69 38.26 47.82 57.39 80 1.86 2.8 3.73 5.6 9.32 13.99 18.65 27.97 37.3 46.63 55.95 82 1.82 2.73 3.64 5.46 9.1 13.65 18.2 27.29 36.39 45.49 54.59 84 1.78 2.66 3.55 5.33 8.88 13.32 17.76 26.64 35.52 44.41 53.29 85 1.76 2.63 3.51 5.27 8.78 13.16 17.55 26.33 35.11 43.88 52.66 86 1.73 2.60 3.47 5.21 8.67 13.01 17.35 26.02 34.7 43.37 52.05 88 1.7 2.54 3.39 5.09 8.48 12.72 16.96 25.43 33.91 42.39 50.87 90 1.66 2.49 3.32 4.97 8.29 12.43 16.58 24.87 33.16 41.45 49.74 91 1.64 2.46 3.28 4.92 8.2 12. S 16.4 24.6 32.79 40.99 49.19 92 1.62 2.43 3.24 4.87 8.11 12.16 • 16.22 24.33 32.44 40.55 48.66 93 1.6 2.41 3.21 4.81 8.02 12.03 16.04 24.07 32.09 40.11 48.13 The heavy figures indicate current taken by motors of average efficiency. Table V. — Single-Phase Motor Current, Showing- the current required by 100-volt single-phase alternating-current mo- tors per horse-power of output. A 200-volt motor requires one-half the current, and a 400-volt motor one-quarter the current given by the table. A two-phase motor requires one-half the current per phase of a single-phase motor. Effi- ciency. .78 * POWER FACTOR OF THE MOTOR. .82 .84 .85 .86 .87 .88 .89 .90 .91 .92 ’75% 12.75 12.43 12.13 11.84 11.70 11.57 11.43 11.30 11.18 11.05 10.93 10.81 76% 12.57 12.26 11.96 11.68 11.54 11.40 11.27 11.14 11.02 10.90 10.78 10.66 77% 12.41 12.10 11.80 11.52 11.38 11.25 11.12 11. 10.87 10.75 10.53 10.52 78% 12.25 11.95 11.66 11.38 11.24 11.11 10.99 10.86 10.74 10.62 10.50 10.39 79% 12.10 11.80 11.51 11.24 11.11 30.98 10.85 10.73 10.61 10.49 10.38 10.26 80% 11.95 11.65 11.36 11.09 10.96 10.83 10.71 10.59 10.47 10.35 10.24 10.13 •81% 11.80 11.51 11.23 10.96 10.83 10.71 10.58 10.46 10.34 10.23 10.12 10.01 82% 11.66 11.37 11.09 10.83 10.70 10.58 10.46 10.34 10.22 10.11 10. 9.89 83% 11.51 11.22 10.95 10.69 10.56 10.44 10.32 10.20 10.09 9.97 9.87 9.76 •84% 11.38 11.10 10.83 10.57 10.44 10.32 10.20 10.09 9.97 9.86 9.76 9.65 85% 11.24 10.96 10.69 10.44 10.31 10.19 10.08 9.96 9.85 9.74 9.63 9.55 86% 11.11 10.83 10.57 10.33 10.20 10.08 9.96 9.85 9.74 9.63 9.52 9.42 87% 10.98 10.71 10.45 10.20 10.08 9.96 9.85 9.74 9.63 9.52 9.41 9.31 ss% 10.87 10.60 10.34 10.09 9.97 9.85 9.74 9.63 9.53 9.42 9.32 9.21 89% 10.74 10.47 10.22 9.97 9.86 9.74 9.63 9.52 9.41 9.31 9.21 9.11 90% 10.63 10.36 10.11 9.87 9.75 9.64 9.53 9.42 9.31 9.21 9.11 9.01 91% 10.51 10.25 10. 9.76 9.64 9.53 9.42 9.32 9.21 9.11 9.01 8.91 32% 10.39 10.13 9.89 9.65 9.54 9.43 9.32 9.21 9.11 9.01 8.91 8.81 Table VI. — Three-Phase Motor Current. Showing the current per phase required by 100-volt three-phase motors per horse- power of output. A 200-volt motor requires one-half the current, and a 400-volt motor one-quarter the current given by the table. jg « POWER FACTOR OF THE MOTOR. H-3 o .78 S .82 00 lO GO .86 .87 .88 .89 .90 .91 .92 75% 7.36 7.18 7. 6.84 6.76 6.68 6. 6.52 6.45 6.38 6.31 6.24 76% 7.26 7.08 6.91 6.74 6.66 6.58 6.51 6.43 6.36 6.29 6.22 6.15 77% 7.16 6.99 6.81 6.65 6.57 6.5 6.42 6.35 6.28 6.21 6.14 6.07 '78% 7.07 6.9 6.73 6.57 6.49 6.41 6.35 6.27 6.2 6.13 6.06 6. 79% 6.99 6.81 6.65 6.49 6.41 6.34 6.26 6.19 6.13 6.06 5.99 5.92 80% 6.9 6.73 6.56 6.4 6.33 6.25 6.18 6.11 6.04 5.98 5.91 5.85 81% 6.81 6.65 6.48 6.33 6.25 6.18 6.11 6.04 5.97 5.91 5.84 5.78 82% 6.73 6.57 6.4 6.25 6.18 6.11 6.04 5.97 5.9 5.84 5.77 5.71 83% 6.65 6.48 6.32 6.17 6.1 6.03 5.96 5.89 5.83 5.76 5.7 5.64 84% 6.57 6.41 6.25 6.1 6.03 5.96 5.89 5.83 5.76 5.69 5.63 5.57 85% 6.49 6.33 6.17 6.03 5.95 5.88 5.82 5.75 5.69 5.62 5.56 5 5 86% 6.41 6.25 6.1 5.96 5.89 5.82 5.75 5.69 5.62 5.56 5.5 5.44 87% 6.34 6.18 6.03 5.89 5.82 5.75 5.69 5.62 5.56 5.5 5.43 5.38 88% 6.28 6.12 5.97 5.83 5.76 5.69 5.62 5.56 5.5 5.44 5.38 5.32 89% 6.2 6.04 5.9 5.76 5.69 5.62 5.56 5.5 5.43 5.38 5.32 5.26 90% 6.14 5.98 5.84 5.7 5.63 5.57 5.5 5.44 5.38 5.32 5.26 5.2 91% 6.07 5.92 5.77 5.63 5.57 5.5 5.44 5.38 5.32 5.26 5.2 5.14 82% 6. 5.85 5.71 5.57 5.51 5.44 5.38 5.32 5.26 5.2 5.14 5.09 Table VII. — Electrical Horse-Power, Figures in body of table are Amperes required to give the Horse-power in the side columns, at Voltage at top of columns. Amperes in body of table. Volts at column heads. HP. 110 115 220 230 500 Amperes in body of table. Volts Column heads. HP. 110 115 220 230 at 500 % 1.679 1.621 .8396 .8105 .373 48 322.4 311.3 161.2 155.65 71.62 % 3.358 3.243 1.6792 1.6215 .746 49 329.1 317.8 164.55 158.9 73.11 % 5.038 4.864 2.5189 2.432 1.119 50 335.85 324.3 167.925 162.15 74.6 1 6.717 6.486 3.3585 3.243 1.492 51 342.55 330.76 171.275 165.38 76.09 2 13.435 12.972 6.7175 6.485 2.984 52 349.3 337.25 174.65 168.625 77.58 3 20.15 19.458 10.075 9.729 4.476 53 356. 343.75 178. 171.875 79.08 4 26.87 25.944 13.435 12.972 5.968 54 362.7 350.2 181.35 175.1 80.57 5 33.585 32.429 16.7925 16.2145 7.609 55 369.4 356.7 184.7 178.35 82.06 6 40.3 38.914 20.15 19.457 8.952 56 376.15 363.2 188.075 181.6 83.55 7 47.02 45.402 23.51 22.701 10.444 57 382.85 369.7 191.425 184.85 85.04 8 53.74 51.888 26.87 25.944 11.94 58 389.6 376.2 194.8 188.1 86.54 9 60.45 58.72 30.225 29.36 13.43 59 396.3 382.66 198.15 191.33 88.03 10 67.17 64.861 33.585 32.431 14.92 60 403. 389.15 201.5 194.575 89.52 11 73.89 71.35 36. 945 35.675 16.412 61 409.75 395.64 204.875 197.82 91.01 12 80.6 77.83 40.3 38.915 17.904 62 416.45 402.1 208.225 201.05 92.5 13 87.32 84.32 43.66 42.16 19.396 63 423.15 408.6 211.575 204.3 93.99 14 94.04 90.805 47.02 45.4025 20.887 64 429.9 415.1 214.95 207.55 95.49 15 101.75 97.29 50.875 48.645 22.38 65 436.6 421.56 218.3 210.78 96.98 16 107.46 103.76 53.73 51.88 23.872 66 443.3 428.08 221.65 214.04 98.47 17 114.18 110.25 57.09 55.125 25.364 67 450. 434.55 225. 217.275 99.96 18 120.91 116.75 60.455 58.375 26.S56 68 456.75 441. 228.375 220.5 101.45 19 127.62 123.23 63.81 61.615 28.348 69 463.5 447.5 231.75 223.75 102.95 20 134.35 129.72 67.175 64.86 29.84 70 470.2 454. 235.1 227. 104.44 21 141.05 136.21 70.525 68.105 31.342 71 476.9 460.5 238.45 230.25 105.93 22 147.76 142.7 73.88 71.35 32.824 72 483.6 467. 241.8 233.5 107.42 23 154.49 149.18 77.245 74.59 34.317 73 490.3 473.46 245.15 236.7 108.9 24 161.2 155.66 80.6 77.83 35.808 74 497.05 479.95 248.525 239.975 110.4 25 167.93 162.15 83.965 81.075 37.3 75 503.8 186.45 251.9 243.225 111.9 23 174.64 168.64 87.32 84.32 38.793 76 510.5 192.9 255.25 246.45 113.4 27 181.35 175.12 90.675 87.56 40.284 77 517.2 499.4 258.6 249.7 114.9 28 188.07 181.61 94.035 90.805 41.775 78 523.9 505.9 261.95 252.95 116.4 29 194.8 188.1 97.4 94.05 43.27 79 530.6 512.2 265.3 256.1 117.9 30 201.5 194.58 100.75 97.29 44.76 80 537.4 518.9 268.7 259.45 119.4 31 208.22 201.05 104.11 100.525 46.25 81 544.1 525.4 272.05 262.7 120.85 32 214.95 207.55 107.475 103.775 47.745 82 550.8 531.8 275.4 265.9 122.35 33 221.66 214.04 110.83 107.02 49.238 83 555.5 538.4 277.75 269.2 123.84 34 228.38 220.52 114.19 110.26 50.73 84 564.2 544.8 282.1 272.4 125.33 35 235.1 227. 117.55 113.5 52.22 85 571. 551.3 285.5 275.65 126. S 36 241.8 233.5 120.9 116.75 53.71 86 577.7 557.8 288.85 278.9 128.3 37 248.5 239.97 124.25 119.985 55.205 87 584.4 564.3 292.2 282.15 129.8 38 255.25 246.45 127.625 123.275 56.698 88 591.1 570.8 295.55 285.4 131.3 39 261.95 252.95 130.975 126.475 58.19 89 597.8 577.2 298.9 288.6 132.8 40 268.68 259.43 134.34 129.715 59.68 90 604.5 583.7 302.25 291.85 134.3 41 275.4 265.9 137.7 132.95 61.17 91 611.2 590.2 305.6 295.1 135.8 42 282.1 272.4 141.05 136.2 62.66 92 618. 596.7 309. 298.35 137.25 43 288.8 278.9 144.4 139.45 64.16 93 624.7 603.2 312.35 301.6 138.75 44 295.55 285.37 147.775 142.685 65.65 94 631.4 609.7 315.7 304.85 140.25 45 302.25 291.85 151.125 145.925 67.14 96 644.8 622.6 322.4 311.3 143.2 46 308.97 298.35 154.485 149.175 68.63 98 658.3 635.6 329.15 317.8 146.2 47 315.7 304.83 157.85 152.415 70.12 100 671.7 648.6 335.85 324.3 149.2 Example: Current required at 230 volts to transmit 75 horse-power. In column un- der 1 230, opposite 75 in the Horse-power columns, is found the number 243.225, which is. the required number of amperes. Table VIII. — Magnet Wires for Electromagnets* Field Coils* etc. Electrical Properties. gS Resistance per 1000 feet at •2 . Various Temperatures. w ffll00 o F. 120° F. 140° F. 150° F. 160° F Current required to give the Amperes per square inch at top of columns. .2 03 1000 1100 1200 1300 1400 1500 1600 1700 1800 “fq 4 .2659 .2766 .2875 .2935 .2995 32.78 36.06 39.34 42.62 45.9 49.18 52.45 55.73 59.01 4 5 .3353 .3488 .3625 .3701 .3776 26. 28.6 31.2 33.8 36.4 39. 41.6 44.2 46.8 5 6 .4229 .4398 .4571 .4667 .4762 20.62 22.68 24.74 26.80 28.86 30.92 32.99 35.05 37.11 6 7 .5332 .5546 .5764 .588 .6005 16.35 17.98 19.62 21.25 22.89 24.52 26.16 27.8 29.43 7 8 .6724 .6993 .7268 .742 .7572 12.97 14.26 15.56 16.86 18.15 19.45 20.75 22.04 23.34 8 9 .8477 .8816 .9164 .9355 .9546 10.28 11.31 12.34 13.37 14.4 15.43 16.45 17.48 18.51 9 10 1.0693 1.1122 1.156 1.18 1.2041 8.15 8.97 9.78 10.6 11.41 12.23 13.05 13.86 14.67 10 11 1.3481 1.402 1.4574 1.4877 1.5181 6.47 7.11 7.76 8.41 9.05 9.7 10.35 10.99 11.64 11 12 1.7 1.768 1.8378 1.876 1.9143 5.13 5.64 6.15 6.67 7.18 7.69 8.21 8.72 9.23 12 13 2.1436 2.2295 2.3173 2.3655 2.414 4.07 4.47 4.88 5.29 5.69 6.10 6.51 6.91 7.32 13 14 2.703 2.811 2.922 2.983 3.044 3.15 3.46 3.78 4.09 4.41 4.72 5.03 5.35 5.66 14 15 3.4085 3.531 3.685 3.7615 3.838 2.56 2.81 3.07 3.33 3.58 3.84 4.09 4.35 4.60 15 IS 4.286 4.458 4.633 4.73 4.8265 2.03 2.23 2.43 2.64 2.84 3.04 3.25 3.45 3.65 16 17 5.4195 5.6365 5.859 5.981 6.103 1.61 1.77 1.93 2.09 2.25 2.41 2.57 2.73 2.9 17 18 6.834 7.108 7.388 7.542 7.698 1.28 1.4 1.53 1.66 1.79 1.91 2.04 2.17 2.3 18 19 8.863 9.218 9.581 9.781 9.981 .984 1.082 1.18 1.279 1.377 1.475 1.574 1.672 1.771 19 20 10.866 11.32 11.748 11.992 12.237 .802 .882 .962 1.043 1.143 1.203 1.284 1.364 1.444 20 21 13.72 14.251 14.812 15.121 15.43 .636 .7 .763 .827 .891 .954 1.018 1.082 1.145 21 22 17.272 17.963 18.671 19.06 19.45 .505 .555 .606 .656 .707 .757 .808 .858 .908 22 23 21.79 22.661 23.555 24.045 24.536 .4 .44 .48 .52 .56 .6 .64 .68 .72 23 24 27.475 28.575 29.701 30.32 30.94 .317 .349 .381 .412 .444 .476 .508 .539 .571 24 25 34.645 36.031 37.451 38.232 39.013 .252 .277 .302 .327 .352 .377 .403 .428 .453 25 26 43.7 45.45 47.242 48.226 49.211 .199 ,21j .239 .259 .279 .299 .319 .339 .359 26 Table IX. — Magnet Wires for Electromagnets, Field Coils* etc. Mechanical Data. The letters S. C. C., D. C. C. and T. C. C. mean single-cotton-covered, double-cotton- covered and triple-cotton-covered. Proportion of 5? Pounds per * g feet * O.Q 02 3 O d 0 d 02 Q T. C. C. 1 Diameter over Number of Insulation. per linear d d d d 0 d d d ^ m A H d Q actual copper turns Layers per inch in coil cross- inch. of coil depth. section. 1 0 0 0 d 0 0 d ® d d d d d d d 1? EH M A Eh m Q Eh O 4 128. 128.38 128.75 .216 .222 .228 4.63 4.5 4.38 4.63 4.51 4.39 .70 .66 .63 4 5 101.65 102.02 102.39 .194 .200 .206 5.15 5. 4.85 5.15 5.01 4.86 .69 .65 .61 5 6 80.7 81.07 81.44 .172 .177 .182 5.81 5.65 5.49 5.82 5.66 5.5 .70 .66 .62 6 7 64.06 64.43 64.8 .154 .159 .164 6.49 6.29 6.1 6.5 6.3 6.11 .69 .65 .61 7 8 50.82 51.18 51.54 .138 .143 .148 7.25 7. 6.76 7.26 7.01 6.77 .68 .63 .59 8 9 40.32 40.65 40.97 .123 .127 .131 8.13 7.87 7.64 8.14 7.88 7.66 .69 .64 .60 9 10 32. 32.30 32.62 .109 .113 .116 9.18 8.85 8.62 9.2 8.87 8.65 .69 .64 .60 10 11 25.4 25.70 26. .097 .100 .103 10.31 10. 9.7 10.33 10.03 9.74 .68 .63 .59 11 12 20.2 20.50 20.8 .087 .091 .095 11.49 10.99 10.53 11.52 11.02 10.57 .67 .62 .58 12 13 16.04 16.36 16.57 .078 .081 .085 12.S2 12.35 11.77 12.85 12.39 11.82 .78 .63 .59 13 11 12.75 13. 13.25 .070 .073 .076 14.28 13.7 13.16 14.3 13.74 13.21 .66 .61 .56 14 15 10.13 10.33 10.52 .063 .066 .069 15.87 15.15 14.49 15.9 15.2 14.55 .64 .59 .54 15 16 8.05 8.2 8.37 .057 .060 .063 17.54 16.66 15.87 17.57 16.71 15.93 .63 .57 .52 16 17 6.4 6.55 6.7 .051 .054 .057 19.61 18.52 17.55 19.67 18.6 17.65 .62 .55 .50 17 18 5.09 5.23 5.37 .046 .049 .052 21.74 20.41 19.23 21.81 20.5 19.35 .60 .53 .47 18 19 3.93 4.07 4.2 .042 .045 .048 23.81 22.22 20.83 23.88 22.32 20.96 .56 .48 .42 19 20 3.216 3.33 3.45 .0375 .0405 .043 26.67 24.69 23.26 26.75 24.8 23.4 .57 .49 .43 20 21 2.562 2.68 2.8 .034 .037 .04 29.41 27.03 25. 29.5 27.15 25.15 .55 .46 .40 21 22 2.04 2.15 2.27 .031 .034 .037 32.26 29.41 27. 32.39 29.58 27.22 .53 .44 .37 22 23 1.628 1.72 1.83 .0275 .0305 .033 36.36 32.79 30.3 36.56 32.99 30.54 .52 .43 .36 23 24 1.303 1.38 1.47 .025 .0275 .03 40. 36.36 33.33 40.16 36.58 33.57 .51 .42 .35 24 25 1.045 1.12 .023 .0255 43.48 39.22 43.66 39.46 .48 .39 25 26 .833 .91 .... .021 .0235 .... 47.62 42.55 .... 47.81 42.81 .45 .36 ... 26 Table X. — Magnet Coils. Giving the mean length per turn, corresponding to a given number of Ampere-turns, at a constant e.m.f. of 1 volt and a temperature of 150 degrees Fahrenheit. For other voltages multiply the constant in the table by the voltage at the coil ter- minals. For other temperatures multiply the result by the constant in the aux- iliary table. 2d a) a a Wire Sizes; B. and S. Gauge. 26 25 24 23 22 21 20 19 18 17 16 1000 .2488 .3139 .3958 .5201 .6296 .7936 1.0006 1.2269 1.5912 2.0065 2.537 1100 .2262 .2853 .3598 .4537 .5724 .7215 .9097 1.1153 1.4465 1.824 2.3065 1200 .2074 .2616 .3298 .4159 .5247 .6614 .8339 1.0224 1.326 1.672 2.1144 1300 .1914 .2414 .3044 .3839 .4843 .6104 .7697 .9438 1.224 1.5435 1.9516 1400 .1777 .2242 .2827 .3565 .4497 .5668 .7148 .8764 1.1365 1.4332 1.8122 1500 .1659 .2092 .2638 .3327 .4197 .529 .6671 .8179 1.0607 1.3375 1.6913 1600 .1555 .1962 .2473 .3119 .3935 .4959 .6254 .7668 .9944 1.254 1.5856 1700 .1464 .1846 .2328 .2936 .3703 .4668 .5886 .7217 .936 1.1803 1.4924 1800 .1382 .1744 .2199 .2773 .3497 .4408 .5559 .6816 .8839 1.1146 1.4095 1900 .131 .1652 .2083 .2627 .3314 .4176 .5266 .6458 .8374 1.056 1.3353 2000 .1244 .1569 .1979 .2495 .3148 .3968 .5003 .6134 .7956 1.003 1.2685 2100 .1185 .14945 .1885 .2376 .2998 .3779 .4765 .5842 .7577 .9544 1.208 2200 .1131 .14266 .1799 .2268 .2862 .3607 .4548 .5577 .7232 .912 1.1533 2300 .1082 .13646 .1721 .217 .2737 .345 .4351 .5334 .6918 .8723 1.103 2400 .1037 .13078 .1649 .2079 .2623 .3306 .4169 .5112 .663 .836 1.057 2500 .0945 .12554 .1583 .1996 .2518 .3174 .4002 .4907 .6364 .8025 1.0148 2600 .0957 .12072 .1522 .192 .2421 .3052 .3848 .4718 .612 .7717 .9758 2700 .0922 .11625 .1466 .1848 .2332 .2939 .3706 .4544 .5893 .7431 .9397 2800 .0889 .1121 .1413 .1782 .2248 .2834 .3573 .4382 .5682 .7166 .9061 2900 .0858 .10823 .1365 .1721 .2171 .2736 .345 .4231 .5486 .6918 .8748 3000 .0829 .10462 .1319 .1664 .2098 .2645 .3335 .409 .5304 .6688 .8456 3100 .0803 .10125 .1277 .161 .2031 .256 .3228 .3958 .5133 .6472 .8184 3200 .0777 .09808 .1237 .156 .1967 .248 .3127 .3834 .4972 .627 .7928 3300 .0754 .09511 .11993 .1512 .1908 .2404 .3032 .3718 .4822 .608 .7688 3400 .07319 .09232 .1164 .1468 .1852 .2334 .2943 .3609 .468 .5901 .7462 3500 .07109 .08968 .11307 .1426 .1799 .2267 .2859 .3505 .4546 .5733 .7249 3600 .06912 .08719 .10994 .1386 .1749 .2204 .2779 .3408 .442 .5573 .7047 3700 .06725 .08483 .10696 .1349 .1702 .2145 .2704 .3316 .43 .5423 .6857 3800 .06548 .0826 .10415 .1313 .1657 .2088 .2633 .3229 .4187 .528 .6677 3900 .0638 .08048 .10148 .128 .1614 .2035 .2566 .3146 .408 .5145 .6505 4000 .0622 .0784 .09894 .1248 .1574 .1984 .2501 .3067 .3978 .5016 .6343 4100 .0607 .07655 .09653 .1217 .1535 .1935 .2441 .2992 .3881 .4894 .6188 4200 .0592 .07473 .09422 .1188 .1499 .1889 .2382 .2921 .3788 .4777 .6041 4300 .0578 .073 .09203 .116 .1464 .1845 .2327 .2853 .37 .4666 .59 4000 .0622 .07846 .09894 .1248 .1574 .1803 .2274 .2788 .3616 .456 .5766 4500 .0553 .0697 .08794 .1109 .1399 .1763 .2223 .2726 .3536 .4458 .5638 4600 .0541 .0682 .08604 .1085 .1368 .1725 .2175 .2667 .3459 .4362 .5516 4700 .0529 .06677 .0842 .1062 .1339 .1688 .2129 .261 .3385 .4269 .5398 4800 .0518 .06539 .08245 .104 .1312 .1653 .2085 .2556 .3315 .418 .5286 4900 .0508 .06405 .08077 .1018 .1285 .1619 .2042 .2504 .3247 .4095 .5178 5000 .0497 .06277 .07915 .0998 .1259 .1587 .2001 .2454 .3182 .4013 .5074 5200 .0478 .06036 .07611 .096 .1211 .1526 .1924 .2359 .306 .3858 .4879 5400 .0461 .05812 .07329 .0924 .1166 .1469 .1853 .2272 .2946 .3715 .4698 5600 .0444 .05604 .07067 .0891 .1124 .1417 .1787 .2191 .2842 .3583 .453 5800 .0429 .05412 .06823 .086 .1085 .1368 .1725 .2115 .2743 .3459 .4374 6000 .0415 .05231 .06596 .0832 .1049 .1322 .1668 .2045 .2652 .3344 .4228 6200 .0401 .05062 .06383 .0805 .1015 .128 .1614 .1979 .2566 .3236 .4092 6400 .0389 .04904 .06184 .078 .0983 .124 .1563 .1917 .2486 .3135 .3964 6600 .0377 .04755 .05996 .0756 .0954 .1202 .1516 .1859 .2411 .304 .3844 6800 .0366 .04615 .0582 .0734 .0926 .1167 .1471 .1804 .234 .295 .3731 7000 .0355 .04483 .05656 .0713 .0899 .1133 .1429 .1752 .2273 .2866 .3624 Table XI. — Magnet Cores. Correction for loss of cross-sectional area due to rounding the corners of rectangular cores. Calculate the sectional area as though the corners were left sharp, and de- duct the amount given in the table; the remainder will be the correct area of the cross-section. Radius of arc at the cor- ners % % % % 11% 1% 1% 2 2% 3 Deduct 0537 .12 .215 .483 .858 1.34 1.93 2.63 3.434 5.375 7.75 Example; A magnet core 4x5 inches has corners rounded to a radius of % inch. The area with sharp corners would be 4X5=20sq. ins. Deduct 0.483; correct area = 19.52 sq. ins. , Table X. — Magnet Coils.— Continued, 15 14 13 12 11 10 9 8 7 6 5 4 3000 1.0634 1.341 1.691 2.132 2.688 3.389 4.272 5.39 6.797 8.571 10.81 13.63 3100 1.029 1.2977 1.636 2.063 2.602 3.28 4.134 5.217 6.578 8.295 10.46 13.19 3^00 .997 1.2572 1.585 1.999 2.52 3.178 4.005 5.054 6.372 8.036 10.133 12.778 3300 .9667 1.219 1.537 1.938 2.444 3.081 3.884 4.9 6.18 7,792 9.826 12.39 3400 .9383 1.1833 1.449 1.8275 2.372 2.991 3.77 4.756 5.998 7.563 9.537 12.026 3500 .9115 1.1494 1.449 1.8275 2.304 2.905 3.662 4.62 5.826 7.347 9.264 11.682 3600 .8862 1.1174 1.409 1.7767 2.24 2.825 3.56 4.492 5.664 7.143 9.007 11.358 3700 .8622 1.0873 1.371 1.7288 2.18 2.748 3.464 4.371 5.511 6.95 8.764 11.051 3800 .8396 1.0586 1.335 1.6832 2.122 2.676 3.373 4.256 5.366 6.767 8.533 10.76 3900 .818 1.0315 1.3006 1.642 2.068 2.607 3.286 4.146 5.229 6.594 8.315 10.484 4000 .7976 1.0056 1.2682 1.559 2.016 2.542 3.204 4.043 5.098 6.429 8.107 10.223 4100 .7781 .9812 1.2372 1.561 1.967 2.48 3.126 3.944 4.974 6.272 7.909 9.973 4200 .7596 .9578 1.207 1.523 1.92 2.421 3.052 3.85 4.855 6.123 7.721 9.736 4300 .742 .9356 1.1797 1.4875 1.876 2.365 2.98 3.761 4.742 5.98 7.541 9.509 4400 .7251 .9143 1.1528 1.4537 1.833 2.311 2.913 3.675 4.634 5.844 7.369 9.293 4500 .709 .894 1.1273 1.4214 1.792 2.26 2.848 3.594 4.531 5.714 7.206 9.087 4600 .6935 .8745 1.1027 1.3905 1.753 2.21 2.786 3.515 4.433 5.39 7.049 8.889 4700 .6788 .8559 1.0793 1.361 1.716 2.163 2.727 3.441 4.339 5.471 6.899 8.7 4800 .6646 .8381 1.0568 1.3326 1.68 2.118 2.67 3.369 4.248 5.357 6.756 8.519 4900 .6511 .821 1.0353 1.3054 1.646 2.075 2.615 3.3 4.161 5.248 6.617 8.345 5000 .6381 .8046 1.0145 1.2793 1.613 2.034 2.563 3.234 4.078 5.143 6.485 8.178 5200 .6135 .7736 .9755 1.231 1.551 1.955 2.465 3.11 3.921 4.945 6.236 7.863 5400 .5908 .745 .9394 1.1845 1.494 1.883 2.373 2.995 3.776 4.762 6.005 7.572 5600 .5697 .7184 .9058 1.1423 1.44 1.816 2.289 2.888 3.641 4.592 5.79 7.302 5800 .55 .6936 .8746 1.1028 1.39 1.753 2.21 2.788 3.516 4.433 5.5591 7.05 6000 .5317 .6705 .8454 1.0661 1.344 1.695 2.136 2.695 3.398 4.286 5.404 6.815 6250 .5104 .6437 .8116 1.0234 1.29 1.627 2.051 2.587 3.263 4.114 5.188 6.542 6500 .4908 .6189 .7804 .9841 1.241 1.564 1.972 2.488 3.137 3.956 4.989 6.291 6750 .4726 .596 .7515 .9477 1.195 1.506 1.899 2.396 3.021 3.81 4.804 6.058 7000 .4557 .5747 .7247 .9138 1.152 1.453 1.831 2.31 2.913 3.673 4.632 5.841 7250 .44 .5549 .6997 .8823 1.112 1.402 1.768 2.23 2.813 3.547 4.473 5.64 7500 .4254 .5364 .6764 .8529 1.075 1.356 1.709 2.156 2.719 3.428 4.323 5.452 7750 .4116 .5191 .6546 .8253 1.041 1.312 1.654 2.086 2.631 3.318 4.184 5.276 8000 .3988 .5029 .6341 .7996 1.008 1.271 1.602 2.021 2.549 3.214 4.053 5.111 8250 .3867 .49 .6149 .7753 .9776 1.232 1.553 1.96 2.471 3.117 3.93 4.956 8500 .3753 .4733 .5968 .7525 .949 1.196 1.508 1.902 2.399 3.025 3.815 4.811 8750 .3646 .4598 .5798 .731 .9218 1.162 1.465 1.848 2.33 2.939 3.706 4.673 9000 .3545 .447 .5636 .7107 .8962 1.13 1.424 1.797 2.266 2.857 3.603 4.543 9250 .3449 .4349 .5484 .6915 .872 1.099 1.391 1.748 2.204 2.78 3.505 4.42 9500 .3369 .4234 .534 .6733 .849 1.07 1.349 1.702 2.146 2.707 3.413 4.304 9750 .3272 .4126 .5203 .656 .8273 1.043 1.314 1.658 2.091 2.637 3.326 4.194 10000 .319 .4023 .5073 .6396 .8066 1.017 1.282 1.617 2.039 2.571 3.243 4.089 Correction Table for Other Temperatures. Temperature 120° 140° 160° Multiplier 906 .943 .98 1.02 Example: A magnet requires 3200 ampere-turns; the mean length per turn may be from 19 to 20 inches; the voltage is 50. To reduce to mean length of the coil to mean length per volt, divide by 50; result, .38 to .4. In the table, opposite 3200 ampere-turns, the nearest number is .3834, and this is in No. 18 column. The wire will be No. 18, there- fore, and the corrected mean length .3834 X 50 = 19.17 inches. Example II.— Conditions as above, but desired temperature 100° F. instead of 150°. The mean length obtained above was 19.17 inches; multiply this by .906; result, 17.37 inches. But it was desired to have between 19 and 20 inches; to find nearest table number, divide 19 or 20— say 19^— by the multiplier, .906. 19.5-^.906 = 21.52 inches; di- vide by 50 volts for ampere-turns per volt = .4304. The nearest numbers opposite 3200 are .3834 and .4972; the former was tried first and found too small. 50 X .4972 = 24.43 inches, so that the choice must lie between this and 17.37 inches first obtained. Table XII-A. — Steam Engine Capacity, Diam. Horse Power Developed.- 3 1.6 1.74 1.87 2.01 2.14 2.27 2.41 2.54 2.67 2.81 2.94 3.08 3% 1.88 2.04 2.2 2.35 2.51 2.67 2.83 2.98 3.14 3.3 3.45 3.61 3V 2 2.19 2.37 2.55 2.73 2.91 3.1 3.28 3.46 3.63 3.83 4.01 4.19 3% 2.51 2.74 2.93 3.14 3.34 3.55 3.76 3.97 4.18 4.39 4.6 4.81 4 2.85 3.09 3.33 3.57 3.81 4.04 4.28 4.52 4.76 4.97 5.24 5.47 4& 3.22 3.49 3.76 4.03 4.3 4.57 4.84 5.1 5.37 5.64 5.91 6.18 4% 3.61 3.91 4.22 4.52 4.82 5.12 5.42 5.72 6.02 6.32 6.63 6.93 4% 4.03 4.36 4.7 5.03 5.37 5.7 6.04 6.38 6.71 7.05 7.38 7.72 5 4.46 4.83 5.2 5.58 5.95 6.32 6.69 7.06 7.44 7.81 8.18 8.55 5y 2 5.4 5.85 6.3 6.75 7.2 7.65 8.1 8.55 9. 9.45 9.9 10.35 6 6.42 6.96 7.49 8.03 8.56 9.1 9.64 10.17 10.71 11.24 11.78 12.31 ey a 7.54 8.17 8.8 9.42 10.05 10.68 11.31 11.94 12.57 13.2 13.82 14.45 7 8.75 9.48 10.21 10.94 11.66 12.39 13.12 13.85 14.58 15.31 16.04 16.77 7y 2 10.04 10.88 11.71 12.55 13.38 14.22 15.06 15.9 16.73 17.57 18.4 19.24 8 11.42 12.38 13.33 14.28 15.23 16.18 17.14 18.09 19.04 19.99 20.95 21.9 8 y 2 12.9 13.97 15.05 16.12 17.2 18.27 19.35 20.42 21.5 22.57 23.65 24.72 9 14.46 15.66 16.87 18.07 19.28 20.48 21.69 22.89 24.1 25.3 26.51 27.71 9y 2 16.11 17.45 18.79 20.14 21.48 22.82 24.16 25.51 26.85 28.19 29.53 30.88 10 17.85 19.34 20.82 22.31 23.8 25.29 26.76 28.26 29.75 31.24 32.72 34.21 11 21.6 23.4 25.2 27. 28.8 30.6 32.4 34.2 36. 37.8 39.6 41.4 12 25.7 27.85 29.99 32.13 34.27 36.42 38.56 40.7 42.84 44.98 47.13 49.27 13 30.16 32.68 35.19 37.71 40.22 42.73 45.25 47.76 50.28 52.79 55.3 57.82 14 35. 37.91 40.83 43.75 46.67 49.58 52.5 55.42 58.33 61.25 64.17 67.08 15 40.16 43.51 46.86 50.2 53.55 56.9 60.24 63.59 66.94 70.29 73.63 76.98 1G 45.69 49.5 53.31 57.12 60.92 64.74 68.54 72.35 76.16 79.97 83.77 87.58 18 57.83 62.65 67.48 72.29 77.11 81.93 86.75 91.57 96.29 101.2 106. 110.8 20 71.4 77.35 83.3 89.25 95.2 101.1 107.1 113. 119. 125. 130.9 136.8 h H S Stroke in inches, multiplied by Revolutions per minute. 25 1800 1950 2100 2250 2400 2550 2700 2850 3000 3150 3300 3450 2S 1731 1875 2019 2164 2308 2452 2596 2740 2885 3029 3173 3317 27 1667 1806 1945 2083 2222 2361 2500 2639 2778 2917 3056 3195 28 1607 1741 1875 2009 2143 2277 2411 2545 2679 2812 2946 3080 29 1552 1681 1811 1940 2069 2198 2328 2457 2586 2716 2845 2974 30 1500 1625 1750 1875 2000 2125 2250 2375 2500 2625 2750 2875 31 1452 1573 1694 1815 1935 2057 2177 2298 2419 2540 2661 2782 32 1406 1523 1641 1758 1875 1992 2109 2227 2344 2461 2578 2695 33 1364 1477 1591 1705 1818 1932 2045 2159 2273 2386 2500 2614 34 1323 1434 1544 1654 1765 1875 1985 2096 2206 2316 2426 2537 35 1286 1393 1500 1607 1714 1821 1929 2036 2143 2250 2357 2464 36 1250 1354 1458 1563 1667 1771 1875 1979 2083 2188 2292 2396 37 1216 1318 1419 1520 1662 1723 1824 1926 2027 2128 2230 2331 38 1184 1283 1382 1480 1579 1678 1776 1875 1974 2073 2171 2270 39 1154 1250 1346 1442 1539 1635 1731 1827 1923 2019 2115 2212 40 1125 1219 1313 1406 1500 1594 1688 1781 1875 1969 2063 2156 42 1072 1161 1250 1339 1429 1517 1607 1696 1786 1875 1964 2054 44 1023 1108 1193 1278 1364 1449 1534 1619 1706 1790 1875 1960 46 978 1060 1142 1223 1304 1386 1468 1549 1630 1712 1794 1875 48 938 1016 1094 1172 1250 1328 1406 1484 1563 1641 1719 1797 50 900 975 1050 1125 1200 1275 1350 1425 1500 1575 1650 1725 Figures in upper section, except the first column, are Horse-power; those in lower section, except the first column, are Stroke X r.p.m. Example: Mean effective pressure = 33 lbs.; stroke (10 ins.) X r.p.m.(250) = 2500; diame- ter of cylinder = 8 ins.; what is the horse-power? Trace horizontally from 33, in M. E. P. column, until 2500 is reached; thence upward into upper section to the number horizontally opposite the diameter. 8; this number, 20.95, is the horse-power. For sizes beyond the range of this table use Table XII-B. t Table XII-B. — Steam Engine Capacity. •5 x Horse-Power Developed.- Q 6 10.71 11.42 12.14 12.85 13.57 14.28 14.99 15.71 16.42 17.13 17.85 18.56 6V 2 12.57 13.41 14.24 15.08 15.92 16.76 17.6 18.43 19.27 20.11 20.95 21.79 7 14.58 15.55 16.52 16.99 18.46 19.44 20.41 21.38 22.35 23.32 24.29 25.27 7V Z 16.73 17.85 18.96 20.08 21.19 22.31 23.43 24.54 25.65 26.77 27.87 29. 8 19.04 20.31 21.58 22.85 24.12 25.37 26.65 27.92 29.2 30.45 31.72 33. 9 24.07 25.7 27.3 28.9 30.52 32.12 33.72 35.35 36.95 38.55 40.15 41.75 10 29.75 31.73 33.72 35.7 37.68 39.67 41.65 43.63 45.62 47.6 49.58 51.57 11 36. 38.4 40.8 43.2 45.6 48. 50.4 52.8 55.2 57.6 60. 62.4 12 42.84 45.69 48.55 51.4 54.27 57.12 59.98 62.83 65.69 68.54 71.4 74.25 13 50.28 53.63 56.98 60.34 63.69 67.04 70.39 73.74 77.09 80.44 83.8 87.15 14 58.33 62.2 66.08 69.97 73.86 77.75 81.64 85.52 89.41 93.29 97.18 101.1 15 66.94 71.4 75.86 80.32 84.78 89.25 93.71 98.17 102.6 107.1 111.5 116. 16 76.16 81.24 86.31 91.39 96.47 101.5 106.6 111.7 116.8 121.8 126.9 132. 18 96.29 102.8 109.2 115.6 122.1 128.5 134.9 141.4 147.8 154.2 160.6 167. 20 119. 126.9 134.8 142.8 150.7 158.6 166.6 174.5 182.5 190.4 198.3 206.3 22 144. 153.6 163.2 172.8 182.4 192. 201.6 211.2 220.8 230.4 240. 249.6 24 166.3 177.4 188.5 199.6 210.7 221.8 232.9 244. 255.1 266.2 277.2 288.3 26 201.1 214.5 227.9 241.3 254.7 268.1 281.5 294.9 308.3 321.7 335.2 348.6 28 233.2 248.8 264.3 279.8 295.4 311. 326.5 342.1 357.6 373.2 388.7 404.3 30 267.7 285.6 303.4 321.3 339.1 357. 374.8 392.7 410.5 428.4 446.2 464.1 32 304.6 324.9 345.2 365.5 385.9 406.2 426.5 446.8 467.1 487.4 507.7 528. 34 343.9 366.8 389.7 412.7 435.6 458.5 481.4 504.4 527.3 550.2 573.2 596. 36 385.5 411.2 436.9 462.6 488.3 514. 539.8 565.4 591.1 616.8 642.6 668.2 38 429.6 458.2 486.9 515.5 544.1 572.8 601.4 630. 658.7 687.4 716. 744.6 40 476. 507.6 539.2 571.2 602.8 634.4 666.6 698. 730. 761.6 793.2 825.2 42 524.8 559.7 594.8 629.7 664.7 699.8 734.7 769.7 804.7 839.7 874.6 909.7 44 576. 614.4 652.8 691.2 729.6 768. 806.4 844.8 883.2 921.6 960. 998.4 46 629.5 671.4 713.5 755.4 797.3 839.4 881.3 923.2 965.3 1007. 1049. 1091. 48 665.2 709.6 754. 798.4 842.8 885.2 931.6 976. 1020. 1065. 1109. 1153. p; H Stroke in Inches Multiplied by Revolutions per Minute. a 25 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 26 2885 3077 3269 3462 3654 3847 4039 4231 4423 4615 4808 5000 27 2778 2963 3148 3333 3519 3704 3889 4074 4259 4445 4630 4815 28 2679 2857 3036 3214 3393 3572 3750 3929 4107 4286 4464 4643 29 2586 2759 2931 3104 3276 3448 3621 3793 3966 4138 4311 4483 30 2500 2667 2833 3000 3167 3333 3500 3667 3833 4000 4167 4334 31 2419 2581 2742 2903 3065 3226 3387 3548 3710 3871 4032 4193 32 2344 2500 2656 2813 2969 3125 3281 3438 3594 3750 3907 4063 33 2273 2424 2576 2727 2879 3030 3182 3333 3485 3636 3788 3939 34 2206 2353 2500 2647 2794 2941 3088 3235 3382 3530 3677 3824 35 2143 2286 2429 2571 2714 2857 3000 3143 3286 3429 3572 3714 36 2084 2222 2361 2500 2639 2778 2917 3056 3195 3334 3472 3611 37 2027 2162 2297 2432 2568 2703 2838 2973 3108 3243 3378 3514 38 1974 2105 2237 2369 2500 2632 2763 2895 3026 3158 3290 3421 39 1923 2051 2180 2308 2436 2564 2692 2820 2949 3077 3205 3333 40 1875 2000 2125 2250 2375 2500 2625 2750 2875 3000 3125 3250 42 1786 1905 2024 2143 2262 2381 2500 2619 2738 2857 2976 3095 44 1705 1818 1932 2046 2159 2273 2386 2500 2614 2727 2841 2955 46 1631 1739 1848 1957 2065 2174 2283 2391 2500 2609 2718 2826 48 1563 1667 1771 1875 1979 2083 2188 2292 2396 2500 2604 2708 50 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 Figures in upper sections, except first column, are Horse-power; those in lower sec- tion, except first column, are Stroke X r.p.m. Example: Mean effective pressure = 36; Stroke = 18 ins.; R.p.m. = 200; Diameter = 16 ins. What is the horse-power? Stroke X r.p.m. 3600; find the number nearest this horizontally in line with the M. E. P. of 36; it is 3611. Trace upward until the number opposite the cylinder diameter (16) is reached; this number (132) is the horse-power. For sizes beyond range of table, take one-half of any factor, except diameter, and multiply the result by 2; for large diameters, take one-half the actual diameter and multiply result by 4. 0 Table XIII.— Engine and Generator Ratios. The figures in the body of the table are ratios of indicated horse-power in engine cyl- inder to output in kilowatts at the generator terminals. is ctf - OO 05 rH CM 1 1— CO r CM CO H CM CO CO CO OO 05 O * 05 in CM o o in o co co CM CM CO CO H 4 l - CO 05 CO 00 H 4 " LO 05 CO l— CM l> t— 00 CM i>- in th c— CO t— O tH 00 H H CM CM CM 00 CM CO CO co TH O 05 CM Oi t— co go in H co th th in cp CM H 4 CM CM 00 CO CM in H o co 00 co 05 Ln CO CO Tf iO> mcoooooc H^oo, 05 CO CO CM C CM CO CO tH ' TH THt-00 co t- in th int — ooocm r-ir-irHCMCM cm co co co in 5 3 00 CO CO CM CM* cm CO tH cm in 00 00 »oo<=> uni co 10 05 05 pH rH CM CM* CM CM CM CO I O CM < > rH CM C th cmcpcp 00 H CO 10 H in cm 05 cp 00 05 rH CM CO tH rH CM CM CM CO in in cm co lOOO^GO H CM ^ in CO co CO rH 05 CO CO 05 < ID l— 05 rH CO t— rH LO o co o CM CM CM CO rf CO 05 <05 05 1 05 O rH CM CO H 4 lO t— 05 < < oo co co co ItHtHiHCM 05 CO tH CM rH CP 1-00 050 CP CP tH TH rH in CM 05 00 O 05 05 05 in H H CM TH 05 I CO CO 0500tHtHtH ■ H CO in O5CPCP00C0 I in 00 rH TH 00 CM CO cm in o m CMtHtH tH 00 O CD CD CM t"" TH TH CP H 05 in CD rH I— CO 05 CP 05 0> cmcmcocoth th in in co co i— t— 000500 in in cm o cm eoinoorfiCM cm th oo co c 00 CM co rH CO HCPHCOC OQHHH co th in co 1— ^3? 3? 50 _ i Cg eg eg M SO CO ' > i* 1 c . . ) 00 c_ tHHHN Cvl( oo-^co CO 05 ■ CO in OO eg t— OOOIONM OOHHH rj< US in 5£> 00 ' m t- eo in eo co tj< -osoc4 «s 00 b-cg o Cg0505 IOOONNC)< irs co 00 oii -4 (M T-100 „ in ct>ooo eoTjiuicooo th co in th O 00 CO I— 05 CO O 05 00 00 coTH^inco CMCOTHH^in 00 in cp o t-CPCMOt- tH O tH th tH CM CO CO TH in CM CM CO CO TH 05 CM CM CM 00 r— CM CM C5COOOTHO rHCSJ CM CO TH r— t— oo cm t— in th 1 — CO t— O tH QO rH rH CM CM CM CM 05 05 ) 00 CM t— tH ) CP 00 05 rH 00 in 00 cm 05 CO 00 TH CD in 00 O cp cm rH tH CM cm CO in rH H 4 CM CM CP 00 H CM 05 TH CP 05 th 05 rH rH rH CM CM CP CM 05 CP C— ^ a 05 th o in hj cj 05 rH CO CP O 4H rH m ri CM CMOOOrHTH CO IH tH tH O C50CMin05 ^?2tHtHCM O5tHtHCMC0 05 O CO CP I rH CM CM CO CO TH IP 05 CM CP CO < r-i CM CM CO ’ ??Sth3^ co in t- cm 1 CpTHOrH o cpcpi>-ocp ^ CP tH 00 rH CO +j CO tH 05 C5 OO CO O tH 05 OO OO 05 CM in CP 05 CM* th bJD ooo C * ej 43 icmoNia 55 in t -4 ci ' f- 05 to £ OJOONOtS g 05 in C