iic^ mi^ y.rr- The Knickeebockee") 20 fQuartcrly, 75c. aYear. i;|I: LiBEAEY. ' Y ■{ jj^i Vol. I. No. 3.j CENTS (. Maech, 1890. KNICKERBOCKER. ^^^ m\ NOTES AND QUERIES EDITED BY WILL P. HART, M. S. J. E. Sheeeill, Pubusher, The Noemal Publishing House, Danville, Indiana. Entered as second-class matter at the post office at i»7^ Danville, Indiana. <^thj i\^ z:^^:.:::^^:^^ '5V,^^c^ THE KNIDKEBBOeKER LIBBM. Subscription Price: 75c. per year; 20c. per number. The Knickerbocker Library will include a series of practical new books peculiarly adapted to the wants of every teacher and student. There is a growing demand for these books, and they are being issued to JBU this demand. The teacher will find them to be some of the most useful and valuable aids in the school-room pub- lished. Every teacher should be a regular subscriber for the Knickerbocker Library. The teacher will find it to be indispensable to success in the school-room. Send 75 cents at once for a year's subscription, and begin with the first number. The following numbers are now ready, and will be mailed to any address Upon receipt of 20 cents per number: No. 1. AMERICAN POETS. By Will P. Hakt, M. S, No. 2. OUTLINES OF ARITHMETIC. By Will P. Hart, MS. No. 3 NOTES AND QUERIES. By Will P. Hart, M. S. The fourth number of the Knickerbocker Library will be issued June 1, 1890, and is entitled: MEMORY GEMS OF POETRY AND PROSE. By Will P. Hart. M. S. Other books in the series are: " Opening Exercises." "Queer Queries," "Primary Writing," "Answers to Queer Queries," "Governments of the World," etc, etc , etc. Address J. E. SHERRILL, Publisher, DANVILLE. IND. Notes and Queries. SOLUTIONS, ANALYSES, QUESTIONS AND ANSWERS ON THE COMMON SCHOOL AND HIGHER BRANCHES. rOR TEACHERS AND STUDENTS. EDIT]p> By Will P. Hart, M. S., »• Editor of "The Teacher and Examiner," and Author of "American Poets," "English Poets," "Normal Methods of Teaching Arith- metic," "The Practical Examiner and. Teacher's Manual," "Outlines of Arithmetic," "Oxdlines of Grammar," "Out- lines of Physiology," "Outlines of History" "Out- lines of Geography " "Memory Gems of Poetry and Prose," Etc., Etc. INDIANAPOLIS, IND.: THE NORMAL PUBLISHING. HOUSE,' J. E. Sherrill, Proprietor. 1889. ; COPYRIGHT BY J. E. SHEER ILL, 1889. I TO THE Teachers and Students "Who Have Contributed so Liberally to "Notes and Queries," this Volume is Kespectfully Inscribed BY The Editor. PREFACE. This little book is made up of queries and answers from tlie department of ^' Notes and Queries " in The Teacher and Examiner, a school journal of which the compiler is ed- itor. The department of ^' Notes and Queries ^' contained so many valuable solutions, analy- ses and answers that the editor deemed them worthy of preservation^ hence the publication of this little book. The editor is not responsible for the an- swers given, or the methods of solution. They are published just as they were sent in by the persons answering them. Where au- thorized to do so, we have given the names and addresses of all persons contributing an- swers. Danville^ Indiana, December, 1888. NOTES AND QUERIES. 1. At what time between 5 and 6 o'clock is the minute-hand midway between 12 and the hour-hand? 12|^ rain.-f^ distance the hour-hand is from 5= distance traveled by minute-hand ; and minute hand travels 12 times as much distance as the hour-hand, ]2 dis=12^min. + ^ dis. 11^ dis =12j min. 1 dis.=l^% min. 12 dis.= l3^\ min.=^M5. Jimes 0. 2. A merchant sold goods and gained 20 fc ; if, however, they had cost him $140 less, and he had sold for same sum, he would have gained 33^ fo . What did goods cost him ? Let a=cost price by first prop, then 1.20a=selling price by first prop. a — $140=cost price by second prop, then 1.33J(a — $140)=1.20a, the same selling price. Multiplying and transposing a= $1,400, the c^st. C, K. Seibbrt, Bristol, Ind. 3. Suppose a man standing on the bank of a river desires to know the distance to any visible object on the other side of the stream,, how can he find the distance, pro- viding he has nothing but a ten-foot pole? NOTES AND QUERIES. Solution: Let it be required to ascertain the distance be- tween A and B, A being inaccessible. rro.Iuce tlie line in the direction of AB to any point, asO; draw the line od at any angle to the line AB; bi- sect the line od through which draw the line Bb, making cb equal to Be; draw the line dba; nlso through c in the direction cA, draw the line Aca, intersecting the line dba; then ba equals AB, the distance re- ^ quired. Wm. J. Rogers,. Paterson, New Jersey. 4. A horse is fastened by a rope 100 ft. long to the side of a circular corral 150 ft. ill diameter; on what surface can he graze? Solution: Let A C F B repre- Fent the corral, C E or A C the rope, and A C F E the area on V7hich the horse can graze. Since C A B is a right angle,^ / C CB ^ ft., the height of the segment A C F. DE=CE— CD=33^ ft., the height of the segment A E F. NOTES AND QUERIES. 9 By means of a table of segments we find the area, of these two segments in the following manner: 66|^150=.444+, and .444 per table=.33682; then .33682X(150)2=7578.45 sq. ft., the area of segment ACF. 33^^200=.! 66+. and .166 per table=.08554; then .08554X(20O)2=342l.60 sq. ft, the area of segment A E F. But the sum of these is the area over which the horse can graze; hence, 7578.45 sq. ft. +3421. 60 sq. ft =11000.05 sq. ft., the area required. This solution is based on the supposition that the horse grazes on the inside of the corral, though the question does not state definitely whether he grazes^ on the inside or on the outside. If the horse grazes on the outside of the corral, the solution will be en- tirely different and much more difficult. Id. 5. A point iu the tire of a bugs^y wheel is in contact with the ground. W^at dis- tance will the point have moved when it next has the same position, the circumfer- ence of the wheel being 15 feet? Also, what kind of a figure will it describe ? Rule — Multiply the diameter of the gen- erating circle by 4. Operation : 15X4 The point will describe a cycloidal curve. Id, 6. Required, the greatest circular segment that could possibly be cut from a sheet-iron plate 64 feet, 4inches long, and 14 inches wide. 10 NOTES AND QUERIES. Solution : Let BAG represent the segment. Since B C is 64^ ft. long, B D is ^ of 64^ ft., or 32|^ ft. in length. A D=l^ ft. Let x=D E. Since A. B E is a a right angle, A DXD E=FD'^ Or, ^=(32^)-^ . 6X(32i)2 x= ^^ ^ — =886f| ft.=rD E. 886f| ft. + l^ ft.=888^\ ft.=A E or diameter of circle, and 888^^ ^t. -^2=4444^ ft.==the radius of the required circle. Id. 7. The Hypotenuse of a right-angled triangle is 41 it,, the base 31 ft. longer than the perpendicular; what is area of triangle ? Solution: H=4l ft. then P''-1-(P+31)2^1681, the square of H. Cempleting square, transposing and collecting : p2_|_3i p=i360. Extracting root P=9. P+31=40 the B. 40X9 then — o — =180 sq. ft., area. C. K. Seibert, Bristol, Ind. NOTES AND QUERIES. 11 8. If tbe extreme point of the minute hand of a clock move 3 inches in 4 min- utes, over how many square inches will the hour hand move in 3 hours if the length of the hour hand equals } the length of the minute hand ? Solution : M. H moves 3 in, in 4 min., or in 1 hr. it moves 15X3 in, =45 in., its entire circumference. •g^^\^=l 1.1408 Id., the diameter of circle. |otii^U^=4.4278 in., the length of H. hand. 4.4278 in. X2X3. 1416=27.82 in., or the circum- ference of H hand's revolution. 27.82 in.X2.2139 in.=59.416 sq. in., the area of H. H. circle of revolution. Then since H, H. moves -^-^ as fast as M. H., it travels in 3 hrs. ^^ of its circumference, and there- fore moves over \ of its own area=i of 59.416 sq. in., or 14.854 sq. inches. . Id. 9. What persons bailed Jeff. Davis ? Ans. Horace Greely and Cornelius Van- derbilt. T. S. Price, Marysville, Cal. 10. What was the most deadly epidemic ever known ? Ans, Fourth epidemic of cholera, 1883, known as the "Damietta Outbreak." B. F. MOSBLT. 11. What period is known as the Hun- dred Years' War between France and England ? Ans. The time from 1346 to 1453 cov- ered the period of the Hundred Years' War. Ella S., Ballstown, Ind. 12 NOTES AND QUERIES. 12. What ancient philosopher thought that the sun was the center of the planetary system ? Ans. Ptolemy. R. D. Lyon. 13. What battle was the turning point in the war of 1812? Ans. The Battle of the Thames. Id. 14. What is the effect on the nervous system of the habitual use of alcohol ? Answer: The effect produced upon the nervous system by the habitual use of alcohol may be divided into four stages as follows : 1. The stage of excitement, in which the nerves become paralyzed, thereby throwing the whole system out of order. 2. The stage of muscular weakness. Now the spinal cord becomes affected, the con- trol of some of the muscles is lost, the muscles themselves also become feebler aa the power of contraction diminishes. 3. The stage of mental weakness, in which the cerebrum becomes implicated, the cen- ter of thought being overpowered, the mind a chaos. Ideas flock in thick and fast. The tongue is loosened. The judg- ment loses its hold on the acts, and the hidden nature comes to the surface. 4. The stage of unconsciousness. IS'ow pros- tration ensues. The brain and spinal cord NOTES AND QUERIES. 13 are both benumbed, and the man is what we call " dead drunk." J. D. C. C, Belleville, Ark. 15. On what philosophic principle is the diving-bell founded ? Ans. That of atmospheric pressure. T. S. Price, Maysville, Cal. 16. How are vacancies in the office of President and Vice-President filled in all the possible contingencies ? Ans. On the death, removal or disa- bility of the President the office is filled successively by the Vice-President and Cabinet officers, the latter ranking in the dignity of their office, the Secretary of State first. In no case does any one succeed to the office of Vice-President. Id. 17. What was the meaning of the cam- paign cry "Fifty-four, forty, or fight?" Ans. A cry adopted during the ]N"orth- western Boundarv discussion bv those who disapproved of yielding our claims to the territory short of 54 degrees 40 minutes north latitude, between the Rocky mount- ains and Pacific ocean. Lena IS'^oble, West Lebanon, Ind. 18. Who were the "Barn-burners?" The " Xnow-nothings ?" Ans. (1.) A name applied to the follow- 14 NOTES AND QUERIES. era of Van Buren, when in 1844 the Demo- cratic party split in two factions. The story of a man who burned his barn in order to free it of rats was told and the case likened to it. (2.) About 1852, when the Whig party was breaking asunder, a secret, oath-bound organization, said to have been called "The Sons of '76" or "Order of Star Spangled Banner,'^ was formed. Those of its mem- bers that had not been admitted to the higher degrees werf kept in ignorance of the aims and name of the organization, and their repeated answer of "I don't know" to questions regarding the society gave them the title of " Know-nothings." Id. 19. I own 10 acres of land in one field ; the j&eld is 9|^ rods lonsrer than wide. Find width and length of field. Solution. 10 acre8= 1,600 square rods. Add half the square of the difiFerence of sides to the product of sides, and extract square root i/ 1600+ ( '^^)^'-^^0^^ "2 =half sum of sides. 80f =^sum of sides — ^^=45=length. ^^ ^ =35f=width. L. B. Hayward, Bingham, 0. 20. A boy can split a cord of wood while a man chops it. The man can split two cords while the boy chops one. What has the boy earned when the man has earned $1? NOTES AND QUERIES. 15 Ans. AccordiDg to the data of the prob- lem, I understand that the man can do f more than the boy. If the boy does f the man will do f . If the man has earned |1 the boy has earned 60 cents. Id, 21. A bin in quarter cone shape has an altitude of 9 ft. If it holds 20 bu. 2 pk. 4 qt. of grain, what is its slant height? Solution : If in quarter cone shape it holds 20 bu., 2 pk. and 4 qt., in cone shape it would hold 4 times 20 bu., 2 pk. and 4 qt., which is 82 bu. and 2 pk., which incu. in.=2150.4 eu. in X82i==177408 cu. in.; al t.=108 in. Then I 77408^^=4928=area of base. v/4928sq in.H-.7854=80:in. nearly, or 6|ft. Radius of base=6|-H2=3J, or base of right an^le triangle of which 9 ft. is the perpendicular. Then i/9^4-3§^ =^9^=9 ft. and 7 in.4- ,2c?. 22. A toor contains 300 sq.ft., and its diagonal is 25 ft. Find the size of floor. Solution: If 25 it. is the diag,, then 25^=fhe sum of the squares of the sides, and 300= the product of the sides. Rule—From the sum of squares subtract twice the product and extract square root, which will be the difference of numbers. Then v^625— 6U0=i/25=5=:diff. of numbers. Add to the product the square of half the diff. of num- bers and extract square root which will be J the sum of numbers |/3U0-(-(2J)^==l 7. 5=^ half the sum of sides or 35=:sum of sides. 35-f 5=40=;twice the length, or 20. 35 — 5=30=--twice the side, or 15. Id. 16 NOTES AND QUERIES. 23. yl^z"- [^jJTofindxandy. Adding (1.) and (2.) x'+y+y^-^x=\9> (3.) Transposing {x'^-{-x)-\-{y'^-\-y)^=\^. (4.) Completing the square of each of these binomials we have (x^+a:+i)+(/+3/4-i)=18+i+J=7^. (5) Since the left band member of this equation con- sists of two perfect ►quares, the right hand member must also be separated into two. and we have (a:^+a:+i) + (yH-y+J)=^«-+\5. (6) Now by inspection of (I.) and (2 ) x is greater than y. Then ^+^+i---¥- (7.) x+h=l (8.) x=%='i. (9.) y+^+i=¥- (10.) y+\=l (11.) y=l=2. (12.) John H. Carroll, New Amsterdam, Ind. 24. What is meant by " Carrying coals to Newcastle " ? Ans, It is a phrase meaning doing a needless thing — taking something where least of all it is needed. Newcastle is a town in England, the centre of the coal mining region — a place where coals of all things are most abundant, and hence the expression. G. W. Hoffman, South Bloomfield, 0. 25. What city is known as the " Bride of the Sea," and why \ NOTES AND QUERIES. 17 Arts. Venice, Italy, in allusion to the marriage of the Adriatic and the Doge. C. L. V. B. 26. If the earth were inclined 40° in- stead of 23J°, how wide would the zones be ? Arts, The Frigid zones would be 40°, the Temperate 10°, and the Torrid 80°. S. T. Briscoe, DePauw, Ind. 27. A man bought a farm for $6,000, and agreed to pay principal and interest in three equal annual installments. What were the annual payments ? Solve by arithmetic. This is a problem in geometrical progres- sion, the sum (S=$6,000) the ratio (r=1.06) and the number of terms (n=3) being given to find the first term (a). The following is the formula: a=S (r — l)-^(r''— 1), to which the interest for one year must be added. The rule is as follows : Divide the interest of the sum for one year by the amount of $1 at compound interest for the given time, less 1, and add to the result the interest of the sum for one year. Solution: $6,OOOX.06=:$360. $360^.191016= $1,884,658+, and $l,884.658+$360=$2,244.658+, Answer. J. E. Bonn ell, Isabel, 111. 18 NOTES AND QUERIES. 28. If f of the time past noon equals f of the time to midnight, what is the hour? A.M. P.M. N 1. 2. TtttoM f t. p. n.=^| t. to m. 1 1. p. n.=h of 1 1. to m.= f t. p. n =3Xt% t. to m.= 1 t. to m.=t. to m. t. to m.=t. p. n. It.toM t- 3 9 f t. to m. to m. If t. to. m. 1 t. to m.=M of 12 hT.=W hr.=7U hr. :12 hr. -^3" ITS '!J3" 12 hr.— 7^f lir.=4^V hr.=t. p. n. Explanation: f of the time past noon equals f of the time to midnight. J of the time past noon equals J of f of the time to midnight, ^ of time to M, etc. 1 [Once] the time to midnight equals the time to midnight. -^ of the time to midnight equals the time past noon, and adding gives 14 c>f the time to midnight equal to the time past noon plus the time to midnight, or 12 hr. The pupil should always be able to place the illustration on the board. The advan- tage claimed for this method is that it re- solves each step into an equation, and Olney says, " The equation is the grand patent for solving problems," to which nearly, if not all, mathematicians will assent. RoBT. C. LiNDSEY, Washington, D. C. NOTES AND QUERIES. 19 29. A tree is 100 feet high ; it breaks and the top strikes the ground 50 feet from the base. What is the height of the stump ? (AAB=100ft. B D=50 ft. B C=perpendicular (p.) D C=hypotenuse (h.) D B=base (b.) '])h+p=100 y (2)-^(l)= 2) h^— p2=b2= [2500 (3) h— p=25 (l)h+p=100 (3)4-(l)=r(4) 2 h=125 (5) 1 h=62^ (6)100—62^=37^ B [=p- Note : h^ — p^=(h+p) (h — p) and dividing this by h+p, thus, (^+P) (^~P) ^h— p. These steps may be difficult to see for one who has not studied alge- bra, yet some one may be benefited. Id. 30. A board is 12 feet long, 18 in. broad at one end and 12 in. at the other ; where must I saw it to have the same amount at each end. 20 NOTES AND QUERIES. ' In 12 ft. of length there is [a decrease of 6 in. In 1 ft. of length there is a [a decrease of ^ in. Starting at the point formed by prolonging the sides, we have : i in. increase^ 1 ft. length. 18 " " =36 " " H C=36 ft. G C=24 ft. Area of A C B=27 sq. ft. " "DC E=12 sq. ft. " "ABE D=15 sq. ft. " " MN ED=7^^q. ft. " " MCN=19j8q.ft. [12 [sq. ft.+7^sq. It.] A C B:MC N::H 0^:8 0^ 27: 19*:: SC^iSC 27SC2=19JX362 1 s c^^gse 1 S C =1/936=30.5941 + 30.5941— 24=6.5941+An8. Id. 31. When the new 4i'8 sell at 105, what must I invest in them to secure an annual income of $983.25 in currency, gold being at 1091, brokerage ^ ? $105 J cur =$100 bond. 4^% of $100=r$4J int. in ($1 g=$1.09J cur. [gold. 1 4^ g =4^X$1.09^ cur.=$4.91625 cur. int. f $4 91625 cur. int.=$100 B. or $105J cur. I of $105ircur=$-15!5L 4.91625 ^ ^4.91625 $1 $983.25 =:983.25X$ 105J 4.91625 :$21050l^^5J NOTES AND QUERIES. 21 32. What is the perimeter of a rhombus, one diagonal being 10 rods and the area 86.60J ? Solution and Demonstration : Draw the figure as given here. Let ABCD= the rhombus whose area ' is86.60iandBDand A C its diagonals, re- spectively. Now, as the area of a rhom- bus is equal to half the product of its di- agonals, if we divide 86.60^ the area of the rhombus, by 10, the length of the known diagonal, it will give us half of the length of the O unknown diagonal. 86.60|-r-10=r8.66025=:halfthelength of the unknown diagonal; .'. 8.66025X2=17.3205=the whole length of the unknown diagonal. .". diagonal A C=10, and di- agonal B D=17.3205. Now, according to a simple geo- metrical theorem, the diagonals of a rhombus mut- ually bisect each other, and are also perpendicular to each other. .. in A A E B, side A E=5 and side B E=8. 66025. Now, because the diagonals of a rhombus are perpendicular to each other .'. A E B is a right A • . '• side A B of the rhombus ABC D^th e hypotenuse of the right A A E B=Va E^+B W^ 4 52+8.660252=10+ = the length of one of the sides of the rhombus A B C D. .-. 4X10+=40+=the perimeter of the rhombus A B C D, which was to be found. Jas. K. Rivers, Ft. White, Fla 22 NOTES AND QUERIES. 33. On a pole 100 ft. high is a globe 100 ft. in diameter ; and on the globe is a man whese eye is 6 ft. above the globe ; a Jine let fall from his eye is perpendicular to the plane of the earth. What is the area of the circle obscured from his View ? B Solution: A=6 ft , B=100 ft. and C=100 ft. A to B=56, or hyp. of a rt. an, triangle. B to D=50, or perp. A to B^v'AB^—DB^^i/se^— 50^=1/ 636 or 25.+. Then by prop. 2,5+ :206 ::50:412+=half di«m. of obscured cir. 824=diam. to find area. 824^X7854= area. L. B. Hatward, Bingham, O. 34. When and where was Jefferson Davis captured? Ans. Jefferson Davis was captured May 10, 1865, near Irwinville, Ga. E. L. Hubbard, Hanover, Kan. NOTES AND QUERIES. 23 35. "What was the popular vote cast for Harrison in 1840 ? Ans. The popular vote cast for Harrison in 1840 was 1,275,017. He received an electoral vote of 234, which has been equaled in but two instances. Those were for Pierce in 1852, and Grant in 1872, and were 254 and 286, respectively. Id. 36. How many Presidents, if any, were elected without their receiving a majority of the popular vote ? Ans. One, R. B. Hayes, in 1876. Hayes's popular vote was 4,033,295 ; Tilden's popu- lar vote was 4,284,265 ; the electoral vote resulted in 185 ballots for Hayes and 184 for Tilden. Id. 37. If 21 cows eat 8 acres of grass in 6 weeks, and 18 cows eat the same in 9 weeks, how many cows will it maintain for 18 weeks, if the grass grows uniformly dur- ing that time? Solution: Consider what each cow eats as composed of 6 parts. Then 21 cows re- quire each week 126 parts, and for 9 weeks 1134 parts. From these preliminaries we have the following: Eight acres afford 756 parts in 6 weeks, so 8 acres afford 972 parts in 9 weeks; hence 1 acre affords 94| parts in 6 weeks, and 1 acre affords 121J parts in 9 weeks. Here we see that 1 acre affords 24 NOTES AND QUERIES. 27 parts more in 9 weeks than in 6 weeks, on account of the 3 weeks' growth in the one case more than in the other. Hence, if 27 parts grow in three weeks, the growth of one week must be 9 parts. Again : Since 1 acre affords 121J parts in 9 weeks, and the growth in 9 weeks is 81 parts, the remainder, 40J parts, must be the quantity of grass on the acre at first. Therefore, the given 8 acres had, at first, 324 parts, and through 18 weeks' growth will have furnished 18X9X8, or 1296 parts more, in all, 1620 parts. This amount would pasture 270 cows one week, and for 18 weeks 15 cows. Ans. The above may be put under the following for- mula: Put a=2l, m=n=p, m='^, g=&, 6^18, r=9, 5=18. Then, the number of cows is ampqr — hmpqr-\-binprs — anpqs mnrs — mnqs Substituting 72576—62208+186624—145152 51840 10368—6912 ~^456^-^^ the number of cows. N. B. — This formula will solve all simi- lar problems. T. A. Pugh, Dumontville, O. 38. Two men are 90 miles apart and travel towards each other, A starting 1 hour before B ; A goes 9 miles in 2 hours, B 11 miles in 4 hours. How far will each travel before they meet ? NOTES AND QUERIES. 25 Solution. — Both go 7^ miles in 1 hr. 90^-7^= 12if=W hr. %%«+ V=34^V miles. 34/^+1=38^. 90 — 4^=85 J miles, distance apart after A goes 1 hr. 85|^7i=ll|f; ll|fXf=53^V 532^9+41=5711, A's distance. 90— 59|f=32|f, B s distance. Id. 39. If I sell oats at 42 J cts. per bushel, my gain is only f of what it would be if I should sell at 56i cts. per bushel. What did they cost me ? Solution. — Let f =the cost. (1). 42i-f =f (561-1). (2). 42^-1=37-1—1. (3). i:r-.5ct. (4). 1=15 ct.=Ans. Id. 40. Divide the number a into three such parts, that the first shall be to the second as m to n, and the second to the third as p to q^ Solution. — Let x=the first part, 2/ the sec- ond, and z the third. Then (1) x-f y+z=a. (2) x:y::m:n. (3) y:z::p:q. (1) = (4) x=a-y-z. (2) = (5) x=^. • • (6) a-ry— z=-^- (7) na — ny — nz=my. (8) my+ny=na — nz. ^ na — nz (3)=(10) y=^- 26 .-. 01) NOTES AND QUERIES, na — nz pz m+n q (12) anq — nqz=^mpz-f-np^. (13) mpz+npz+nqz=anq. (14) ,=_^^?^. ^ ' mp+np+nq anp ^™^mp+np-f-nq amp mp+np+nq Put a=42, 71^2, w=3, jt?=4, g=5. Then by substituting these values, we shall have: x=n. 3/=14f, 2=18. Id. 41. Diagram, and parse " far ": Our island home is far beyond the sea. home I is : beyond sea Our island the I far " Far " is an adverb, and modifies the phrase "beyond the sea." Id. 42. Analyze, and parse italicized word: To be idle is wrong. To be idle | is : wrong. **To be idle" is the subject, "is" is the 'Copula, and "wrong" is the predicate. " Idle" is an adjective used abstractly. (See remark under R. XII., Harvey.) Id. 43. A. T. Stewart & Co. imported 10 cases of shawls, averaging 216 pounds a case, invoiced at 24,884.10 francs; the duty being NOTES AND QUERIES. 27 50 cents a pound 35 per cent, ad valorem. The invoice was paid with a bill of exchange bought at 5.16 francs to the dollar. What was the duty and what did the shawls cost after paying other charges to the amount of 175. 80? Solution. — 10 cases of 216 lbs. each=2160 lbs. 5.16franc8=$1.00; 1 franc— $.193. 24884. 10X$.193=$4802.63=Invoice. $4802.63X.35=$1680.92=ad. val. duty. 2160 lbs. at 50c.=^$1080.00:^sp. duty. $2760. 92= whole duty. Other charges, $75.80. Whole cost, $7639.35. J. E. ISuTTON, Scianton, Miss. 44. Can the electoral vote of a State be divided? If so, has it ever been done? When, and where ? It may be divided. In California, in 1880, five Democratic electors for President and one Republican elector were chosen; one of the Democratic electors for the State at large, Judge Terry, running behind the ticket, resulted in the election of Egerton, B-epublican. The other Democratic elec- tor, Wallace, was elected, making five Dem- ocrats and one Republican. Id, 45. Who was Pompey ? A Roman Consul who raised himself to the dictatorship of Rome without being subject to either the popular or senatorial party. Csesar being at the head of the lat- ter party, Pompey, wishing to rule su- 28 NOTES AND QUERIES. preme, made a break with Caesar which led to civil war between them. Pompey was defeated at Pharsalia and fled to Cili- cia, where he collected a small body of soldiers, and then sailed to Alexandria. Septimius stabbed him as he was landing. Id. 46. Four balls are lying on the floor. A fifth ball is placed on top of these. What is the distance from center of fifth ball to floor, each ball being five inches in diameter ? Lines connecting centers of any three of lower balls form a right-angled triangle of which base and perpendicular are each 5 inches, and whose hypotenuse is therefore ^2 (5)2=7.071 inches. This hypotenuse, 7.071 inches, divided by 2=3.535 inches, which forms the base of another right-angled triangle, which has for its hypotenuse a lino connecting centers of a lower and the upper^ or fifth ball being 5 inches long. The per- pendicular of this second triangle is a line drawn from center of fifth ball down to hypotenuse of first triangle, and is in length y/ 52— 3.535^=3.536 inches. 3.536 inches+2J inche8^6.036 inches, the dis- tance from center of fifth ball to floor. C. K. Seibert, Bristol, Ind. NOTES AND QUERIES. 29 47. In division of fractions why do you invert the terms of the divisor and multi- ply the numerators together for a new num- erator and the denominators together for a new denominator ? The object of inverting the divisor is to find how often the divisor is contained in one. Knowing this, we find how often it is contained in the dividend by taking such a part of the inverted divisor as the dividend is part of one. This is done by multiplying the numerators together for a new numera- tor and the denominators for a new denom- inator. To illustrate, we will take the simple example f ^f . i is contained in one four times, then f are contained in one ^ as often as \, that is ^ times. If f be contained in one |- times it is contained in J of one, J of f or -| times. If the divisor is contained in J |- times, it is contained in f twice |^, or f times, P. W". Singleton, Farmington, Ky. 48. A, B and C start from the same point and travel in the same direction about an island 73 miles in compass, A at the rate of 6, B at 10, C at 16 miles per day, in what time will they be next together ? Solution. — '^-^j ^, ^|=:number of days it will take each to travel around it. 30 NOTES AND QUERIES. The L. C. M. of these numbers =: the re- quired number of days, which is 36J. John M. Colaw. 49. This is money that I did not earn. What is the predicate of this sentence? The complex pred. is *' money that I did not earn;" *'that 1 did not earn" is an ad- jective element limiting "money." L. B. Hayward, Bingham^ 0. 50. Where is the Gate of Tears? The strait of Babelmandeb, the passage from the Persian Gulf to the Red Sea, is called the "Gate of Tears" by the Arabs. The channel is only about twenty miles wide, and is rocky, and very dangerous for passage in rough weather. It received its melancholy name from the number of ship- wrecks that occured there. F. L. D., Lima, 0, 51. AVhat was the " Rosetta Stone ? " Ans. During the expedition of the French to Egypt, under Napoleon, at the close of the last century, an engineer, in digging the foundation of a fort near the Rosetta, mouth of the Nile, found a stone tablet about three feet long, on which was an inscription in three different characters. This was the famous " Rosetta Stone." One of the three texts (the lower one) was Greek, and of NOTES AND QUERIES. 31 course, was readily translated ; the text at the head was in the mystic hieroglyphic character ; the intermediate was in a char- acter since called Demotic (Demos, the people), that is, the writing of the common people. This inscription was copied and circulated among scholars, and after long and. ingenious efforts, the alphabet of the hieroglyphic was made out, so that now these carvings are read with ease and cer- tainty, and a new flood of light has been thrown on the history of ancient Egypt. The great work of deciphering these char- acters was mainly effected by the French savant, Champollion. P. C. Coy. 62. A person being in a boat 3 miles from the nearest point of the beach, wishes to reach in the shortest time a place 5 miles from that point along the shore ; supposing he can walk 5 miles an hour, but row only at the rate of 4 miles an hour, required the^ place where he must land. 82 NOTES AND QUERIES. B 3 % ^ -^ vv "^ vv \ \ 1 1 Solution. — From the figure, the distance rowed is ■i/{x'^-\-9) miles, the distance walked 5 — a:mi., and u, the whole time taken, is evidently, "- -4 -i— 5- hours, and x must have a value that ^ will make u a mini- mum. Hence, by dif- ferentiation Dx u = Dx^ u = i, and 9 4(a;2+9)^ Solving 4i/(.r2 + 9) — 1=0, we get x = =h 4; but on substi- tuting these values of r» in turn in the expression for Dx u, /^ we see that x=4 is the only value which will make Dx u, =0, since we must take the positive value of !/( a;^ -|- 9 ), as it represents a distance traversed. Hence, we find [i)a;2 w] a;=4=5^; and w then is a minimum w^hen «=^4, and the landing place must be 1 mil above the point of destination. John M. Col aw, Monterey , Va. NOTES AND QUERIES. 33 53. I sold a team of horses for $700.00 ; on one I gained 20%, on the other I lost- 20% ; my total loss was $50.00. What was the cost of each? Solution. — The loss exceeded the gain by $50.00, and to lose $50.00 at 20% would take $250.00 ; therefore, the horse on which he lost must have cost $250.00 more than the other; but they both together cost $750 00 ; hence, one cost $250.00 and the other $500.00. Id. 54. An express train left New York City, running at the rate of 25 miles an hour, and reached a certain town at 10 in the morning. A freight train left New York City ten min- utes later, running at the rate of 18 miles an hour, and reached the same town at 6 min- utes past 11 A. M., the same day. Required the starting time of the express and the dis- tance of the town reached. 8olutio7i.- — 11 hr. 6 min. 10 " 10 " 56 minutes, diff. in time, 60 - 25=2| ; and 60^18 = 3J. Then 3J— 2|- =^, difference in time for each mile. 56^ ^=60 mi. to make a diff. of 56 min. 10 hours less 2^ hrs.=7f hrs.=7 hrs. 36 min. Ans. 7 o'clock and 36 min. A. Mi Dis*- tance, 60 miles. Id, ' 84 NOTES AND QUERIES 55. ic2_w2z= x' ;_^3_i9 (2) r to find X and y. i3) (x — y) (x-\-y)=z5 from (1) by factoring. 4) (a; — y) (x^-txy+y^)=^ld from (2) by fac- toriDg. (^) \^^Jy^y ^T9 ^y cancelling :i— 7/ in (5) Now since an equation is an expression of the equality of ratios, from (6) we have the following proportion (the denominators be- coming antecedents). (7) a?-\-xy+y^ : x+y : : 19 : 5 (8) x^+xy+y^ : 19 : : x+y : 5 by alternation (9) x^-^-xy + 'jf :ld :: x'^ + 2xy + y^ : 25, since raising both terms of a fraction to the same power (2d) does not alter its value. (10) x^+xy+y^:x^+2xy+f::19:26 by alter- nation, ril) xy : a^+2xy+y^ : : 6 : 25 by division (12) 4xy : oi^+2xy^^ : : 24 : 25, since multi- plying the antecedents of a proportion by the same number (4) does not destroy the pro- portion. (13) x^—2xy^7f : x^+2xy+y'' : : 1 : 25 by di- vision (14) X — y : x-\-y : : 1 : 5, since like roots of the terms of a proportion are also in proportion. NOTES AND QUERIES. 86 (15) 5x — by=zx+y, since product of means equals the product of the extremes. (16) 4x^6y by subtracting x and adding 5y to each member of (15). (17) a?=— ; substitute this in (1) gives ^ V 2 f^ 4 -^ 9/_42/2=20 by^=z20 f=4 2/=2 ^ . x = |^=3, substituting in (17) Philip B. Hays, Brandenburg^ Ky, 56. What sum invested in U. S. 5's of 1881, at 118, will yield an annual income of $1,921 in currency when gold is at 113? Solution : $1,921-1. 13-^$l,700=Income in gold. $l,700-.05=$34,000=Par value of bonds. 134,000X1. 18=$40,120-=C^st of bonds. Ella S., Ballstowny Ind. 57. Multiply 18 da. 9 hr. 42 min. 29.3 sec. by 16^. Solution: 18 da. 9 hr. 42 min. 29.3 sec. 16-7- ^^11 305y\da. 16y\hr. 46y\min. 7^ sec. 36 NOTES AND QUERIES. Reducing fractions, 305 da. 16 hr. 46 rain. TiVoSec. 10 " 54 " 32y\ '' . 43 " 38-32- " 43_7_ " 306 da. 4 hr. 25 niin. 2 sec, nearly. L. B. Hayward, Bingham^ 0. 58. What is the side and end of a rect- angular field whose area is three acres and bounded by 104 rods of fence ? Answer : Ride. — From the square of half the perimeter, take four times the given area, and extract the square-root, and to one- half of this add J of the perimeter, which gives the length. Take the difference for the width. Solution.— I oi lOA=b2 rods; (52)2=2704; 3^=480 sq. jrds; 480X4=1920; 2704— 1920=784; >/ 784=28 ; J of 28=14; J of 104=26; 14+26-=40, length; 26—14=12, width. Cadmus, Oak Hill, 0. Another solution of the above problem ; Put y = one side, and X = one end. Then xy = 480 sq. rods = area. (1) and 2a;+2Y/=104=rods of fence. (2) Then Xz= y and x= NOTES AND QUERIES. 37 104—2 y 2 Putting values of ic=to each other 480 10-4—2 y (3 ^ Clearing of fractions, transposing and re- ducing 2/' — 52 :y =— 480. (4) Putting y=z(v+26) in (4) Wc have (?;+26)'— 62 (y+26):=— 480 (5) Then v^+b2v-^()7Q—b2v— 1352=— 480 (6) Cancelling, summing and transposing /l6.5X6.5X5.5X4.5=51.52=area 51.52X4=206.08=four times area 78 NOTES AND QUERIES. 1,320-206. 08=r6.405+rd.=distance from each one to the well? Jerome Erdley, Middleburgh, Pa. 130. A lady, the mother of three daugh- ters, had a farm of 600 acres in the form of a circle, with a residence in the center. Being desirous of having her daughters near her, she gave each of them a farm in the form of a circle with a residence in the center of eacli. How much did her daugh- ters get, and how far apart were they? How much did the lady keep, and how far was each dauirhter from her? Solution : ^500X160— 80, 000sq. rd . Di- ameter of large circle^/ 80,000-^.7854=:: 319.19. llTow, letting the diameter of one NOTES AND QUERIES. 79 of the Small circles=2 and the radius=l, to find distances from center of circles to center of large circle use rule given in question and answer No. 129. 2X2X2=product of the three sides. Area of triangle=i/2'— r=i/3=^1.732 1.732X4=6.928=four times the area. 8-6.928=1.15 distance from A, B or C to center of circle; . • . the ratio of the radius to the distance from the center of each cir- cle to the center of the large circie^^l : [1.15. . • . 1+1.15=2.15 or radius of large circle. Diameter of large circle=2 15X2-=4.30. 4.30 : 2 : : 319.19 : x, or diameter ot one of the daughters' tracts of ]and=rl48.46+rd. The distance they are apart=the diam- eter of the circlesr=148.46+rd. The distance the daughters are from the lady=(319.19-2)— (JX148.46)=85.365rd. Area of each daughter's tract equals 148.46+2x.7854=17;310.5sq. rd. 17,310.5 -:-160=108 A. 30.5sq. rd. What the lady had left=500A.— (3X108 A. 30.58q. r(i.)=^175A. b8.5sq. rds. Id. 131. What is meant by the X Y Z Mis- sion ? Answer: During the Revolution the II. S. secured the valuable aid of France by Treaties in 1778. In 1789 monarchy was 80 NOTES AND (^)UERIES. overthrown in France, and that nation soon found herself at war with England and other European nations. She desired the U. S. as an ally, and Genet was sent to accomplish her purpose. His mission failed. Washington persisted firmly in preserving our neutrality, and Jay's Treaty was con- cluded with England. The course of our government angered France. In 1797 the Directory, which then governed that coun- try, gave permission to the French navy to assail our vessels. Following a policy of conciliation, m spite of French insult^ to our minister and the threat to our commerce. President Adams called a special session of Congress in May, 1797, and Charles Cotes- worth Pickney, John Marshall and Elbridge Gerry were sent to France to arrange mat- ters. In the spring of the next year the President submitted to Congress dispatches that had been received from these com- missioners. They had been kept waiting by Talleyrand, the Minister of Foreign Afiairs, and had been approached by three unofficial persons with what was in effect a demand for a bribe and a loan to the Direc- tory before any arrangement could be con- cluded with the U. S. In the dispatches the names of the three persons were indi- cated merely by the letters X Y Z, and KOTES AND QUERIES. 81 hence the whole affair came to be termed the X Y Z Mission. Philip B. Hays, Brandenburg, Ky. 132. I have a circular garden containing ■75sq. rd. What must be the side of a square field to contain it ? ^ — nB ABC D=the square. E F— diameter of cir- cle. E F=D C or A B. ^ 7 5-^.7854= 95.492729. 1/95.492729=9.772 = E F=A B or D C in rds. Id. The evening was glorious, and light through the trees, Played in the sunshine the raindrops, the birds and the breeze ; The landscape outstretching in loveliness lay On the lap of the year, in the beauty of May. Diagram, and parse *4ight." 82 NOTES AND QUERIES. 'evening | the {glorious and through trees | the light raindrops | the birds j the and breeze I the Played in sunshine | the [The ' landscape < [ outstretching | in loveliness , (the on lap •< lay of year | the m beauty I *^®j^^y Light is an adjective, descriptive, com- mon, in the predicate after the copulative verb "was,'' and modifies the noun "even- ing." Rule X, Rigdon. Id. 134. A banker owns 2J% stocks at 10 fo below par, and Sfc stocks at 15% below par. The income from the former is 66|^ more than from the latter, and the investment in the latter is $11,400 less than in the former. Required the whole investment and income. Solution : (1.) Let 100%=Investment. (2.) 100%— $ll,400=money to be di- [vided into two equal parts, to [find latter investment. NOTES AND QUERIES. 83 (3.) 100%-$11,400 ^ • ^ ^ ^ =50 f^— $5,700 latter [investment. (4.) 50/^-?5,700+$ll ,400=50% +$5,700 [former investment. (5.) 50% , $5,700 ^ _ -qTt-H — qk — = par value of former [stock, 2i/»of(6)=(6)=J.^,+%^tbr- [mer income. A • /QN . Qfc rn\ 50% 15,700 1 Agam (3)-^85=(7)=-g^-^i^-^par val- [ne latter stock. 8f. of (7)=(8)=A^/„-!g-l= j^. [come from latter. By tlie conditions of the prol)lem, former income=latter i 6^%% or I of latter+latter K } % |^j^q7» - 85 J 170 85 (10-) [iTo^^-^ J + 1 170^"- "ST , 5 $285 , ., . =jpjQ%-^ latter income 84 NOTES AND QUERIES. Now (10)=(6W^4-^,_!|P=3-|5.^,^ $5,70a 3600 19 $1,007, . . -, ^^1224 ^^^^M~ ^ ti'ansposiDg and [uniting terms* 19 ?6,042 1. ;, • . '^'' 1221^^^1124 ^ ^e^^ci^g ^o a [CD. or 19/^=16,042 by omitting the CD's, 1%=$318. 100 %=:P1,800, whole investment. ^^^^ |?li?2tz!H!^=.|10,200, latter [investment (from (3).) f^^. 110,200.00 ^,^,,, , (12.) 'g^ =112,000, latter stock. 3% of $12,000=$360, income on Ratter, t of 360=$240. [mer[ |240+$360=$600, income on for- $600+1360=1960, whole income. Id. 135. She wp with her fist Parse "up.* Ans, C//9 is a verb, irregular, intransi tive, active, indicative, past, third, singular, to agree with "She" as its subject, Rule 13, NOTES AND QUERIES. 86 Harvey, See Harvey's Gr., old ed., p. 194, rem. 7. Id. 136. " Pass we, then, to the next circle." ' — Dante's Inferno. Parse Pass and we. Aas. Pass is a verb, regular, intransitive, active, imperative, present, first, plural, to agree with its subject "we," Kule 13, Har- vey. Authority, Butler's P. and C. Gr., p. 94. We is a pronoun, personal, simple, first, plural, common, Eule — A pronoun agrees with antecedent in gender, number and person, nominative, subject of the finite verb "Pass," Rule 1, Harvey. Id. 137. They had no suspicion of his being John. • thad I suspicion | ^f being-John. his His is a pronoun,personal5simple, singu- lar, masculine, third, to agree with its ante- velocity of 4,700 feet per second, and in air 1,090 feet per second. Hence the more moisture the air contains the better me- dium of sound it is. Id. 152. Why is the rainbow always seen bent in the shape of a bow? Answer. The deviations of the incident and emergent colored rays of the rain-drop of the primary bow are between 42° 2' and 40° 17'. The axis of the bow is a straight line passing from the sun through the ob- server's place to the opposite point of the sky. Hence all the emergent rays meeting the eye of the observer must be equally NOTES AND QUERIES. 93 inclined to the axis of the bow, which causes the bow to be circular. Id. 153. What were the names of the "Seven "Wise Men of Greece," and when did they live? Answer, Tbe Seven Wise Men of G-reece are supposed to have lived in the fifth cen- tury B. C. Their names were Pittacus, Bias, Solon, Thales, Chilon, Cleobulus, and Periander. Certain strangers from Miletus agreed to buy whatever should be in the nets of some fishermen without seeing it. When the nets were drawn in they were found to contain a golden tripod, which Helen, as she sailed from Troy, is supposed to have thrown there. A dispute arose between the fishermen and the strangers as to whom it belonged, and as they could not agree, they took it to the temple of Apollo, and consulted the priestess as to what should be done with it. She said it must be given to the wisest man of Greece, and it was accordingly sent to Thales, who declared that Bias was wiser than he, and sent it to him. Bias sent it to another, and so on until it had passed through the hands of all the men, afterwards distinguished by the " Seven Wise Men," each one claiming that the others were wiser than he was. It was 94 NOTES AND QUERIES. finally sent to the temple of Apollo, where, according to some writers, it still remains, to teach the lesson that the wisest are the most distrustful of their wisdom. T. A. PUGH. 154. I have a three-cornered lot which contains an acre ; each of the three sides is equal. What is the length of one side? If possible, by arithmetic. Solution, This admits of two very nice solutions. First, by the rules of Arith. Art. 532 Milne or 397 Ray's Higher. The area of an equilateral whose sides are one yard each, is .0000894654+ of an acre. We may therefore form the proportion thus: t/ [0000894654+ : 1 :: 1yd. : (?), and solving this we get 105.723+yd. for one side. Second : Since the area of an equi- lateral= the (base)^XJv^. 75, because by Art, 529 Milne, 420 White or 396 Ray, the alti- tude=the baseXV.75; therefore, the (base)^ =thearea-^Ji^.75 or thebase^-^^area^Ji/.TSy An acre=160 sq. rds.; therefore, we have: i/ 160 vr;7-^=19.22241327+rds. or 105.72327+ yds. Mont. F. Vale. 155. A borrows a sum of money at 4 per annum, and pays the interest at the en( NOTES AND QUERIES. 95 of the year. He lends it out at the rate of 5% per annum, and receives the interest half-yearly. By this means he gains f 100 a year. How much does he borrow? Solution, Assume $1 as the amount. At the end of the year at 5%, will have drawn f.050625 interest. Deducting |.04, the amount of interest he pays, from $.050625 we have a remainder ot |. 01 0625, w^hich is the gain on fl. In order to gain $100 he must borrow as man^y dollars as $.010625 is contained times in $100, which is 9,411. 76-r times. .*. he borrows $9,411.76+. John Schurr, Muncie, Ind. 156. What must gold eell for that an investment in 5-20's at 120, may yield 8 per cent, interest on the income ? Solution. Let 100fo=par value of bonds. (1) 6%=income on bonds paid in gold. (2) 120%=current value of bonds. (1) 6% of 100 per cent. =^6 per cent, in- come paid in gold. (2) 6%=? per cent, of 120 per cent, cap- ital invested. (3) l%=^^of 120/.. (4) 6%=6Xyi-g-=YfQ=5 per cent, rate of income capital. 6 per cent, of 100 per cent, (par value of bonds)=5 per cent, of 120 per cent. (amt. invested). Then gold must be at a pre- 9G NOTES AND QUERIES. mium, so as to increase the rate of income on investment from 5 per cent, to 8 per cent., which is 3 per cent. (1) 3 per cent, of 120 per cent.=3.6 per cent. (2) 3.6 per cent.=? per cent, of 6 per cent, (income in gold). (3) 1 per cent.=i of 6 per cent. (4) 3.6 per cent.=3.6Xi=%6=.60=60 per cent. Therefore, gold must be at a premium of 60 per cent., or be quoted as 160. C. H. Allen, Winchester, Ind. 157. It is required to enclose a piece of ground with a fence 10 rails high, 2 pan- els to the rod, and to have just as many acres enclosed as there are rails in the fence. What will be the size of the enclosure, and what number of rails will it require ? Solution. Reduce one acre to the lowest given denomination, divide it by the given number, and multiply the quotient by 4, for the side of the square. In this problem the lowest denomination is twentieths of a rod and the given number is one of these twen- tieths; for there are to be as many acres in the field as there are twentieths of a rod in the circumscribing lines. 160X20=3,200 twentieths of a rod in one acre and a strip -^ wide and ^f^^ long will equal one acre. NOTES AND QUERIES. 97 Then 3,200X4=12,800 rods, or 40 miles, side of square and 12,800X20=256,000 rails, or twentieths of a rod in one side, 4 times which=l, 024,000, number of rails and acres in the field. Wimmer, Coshocton, O. 158. A farmer buys a flock of sheep at the rate of |35 for every 5 sheep ; he af- terwards loses 9, and sells the remainder at $80 for every 11, and the sum for which he sells the flock is $120 more than that which he gave for it. How many sheep were there ? Solution. Let x='^o. of sheep in flock when bought; x — 9=Ko. of sheep in flock when sold. If he bought 5 sheep for $35, he bought one sheep for i of $35, or $7 ; and if he sold 11 sheep for $80, he sold one sheep for „ of $80, or $f^. Then 1x=Q,o^t of flock. And ff (x— 9)=3eiling price of flock. f^ (x-9)-7x=120 80X-720 • ,^^ —^ —lx=120 80x-720-77x=l,320 3x=2,040 a:=680=]Sro. sheep in flock. Xax. 159. A twelve-inch ball is in the corner 98 NOTES AND QUERIES. where walls and floor are at right angles. What must be the diameter of another ball which can touch that ball while both touch the same floor and the same walls ? Solution. Suppose a cube circumscribed about the two balls ; the line A B will rep- resent the diagonal of the cube and also the axis of the two balls. The dimensions of a cube circumscribed about a sphere one ft. in diameter are one ft., and the diagonal of the cube=i/l^X3= T/3=1.732ft. A M=D B (each being the distance from the sphere to the nearest dihedral angle of the cube). NOTES AND QUERIES. 99 A B=1.732ft. diagonal of the cube. M D=lft. diameter of sphere. AM+D B=1.732ft.— lft=.732ft. AM-Jof.732ft.= 366ft. A M=D B. . • . D B=.366ft. M B=ltt.+.366ft-1.366ft. IS^ow form the proportion. MB :MD ::DB: Dx, or 1.366:1::. 366: Da;. Dx=lX^6_2679 1.366 .-. Dx= 2679ft. or 3.2148in. The diameter of the smaller ball is 3.2148 inches, W. L. Damkoehler, Sturgeon Bay, Wis. 160. Suppose a man standing on the hank of a river desires to know the distance to any visible object on the other side of the stream, how can he find the distance, providing he has nothing but a ten-foot pole ? Solution. This problem has been solved, but while the solution is true as regards the principles of geometry, its practical value would be rendered useless in nine cases out of ten for lack of suitable back-ground •upon which to make the measurement. The following, I think, has no published equal for ease, simplicity and practical utility : 100 NOTES AND QUERIES. Let B be the object on opposite side of the stream, and A or H the point to meas- ure from. Produce BA. to C, any distance, and construct AC FH, any form of the parallelogram, and produce BH to P; also CF. Now measure AH, also HF and FP. Then by similar triangles : FP : FH : : AH : AB, or FP : AH : : FH : AB. Now, if BH is to be found, measure HP^ and FP : PH : : AH : HB. J. K. Ellis, Emma, Ky. 161. What will it cost to fence a field in NOTES AND QUERIES. 101 the form of an equilateral triangle, altitude 20 rods, at 80 cents per rod ? Solution. Before solving the above, per- mit me to explain how and why I solve it thus : Let A B C be an equilateral triangle, with C D the altitude. Let the side, as A C be 1, then A D^J. Finding D C by the rule, we have : V \'^—^'^=V\^— 1/1= 1/775=. .866=D C, ^or altitude, when the side is 1. Dividing the side by this, we have 1-^ .866=1. 15473=the ratio of the side to the altitude. Now, .*. this is as constant as the ratio of the circumference of a circle to its diameter; .*. when the side is given, To lind the altitude: Rule L Divide the side by 1.15473, the result will be the altitude. To find the side when the altitude is ^iven : Rule II. Multiply the altitude by 1.15473, the result will be the side. The above problem is of the latter class. . • . 20X1.15473=23.0946=one side. 23.0946X3=69.2838=perimeter. 69.2838X$.80=$55.427=cost. Id. 102 NOTES AND QUERIES. 162. A floor contains 300 square feet, and its diagonal is 25 feet. Find the size of the floor. Solution. The sum of the squares of any two numbers increased by twice their pro- duct, will equal the square of their sum; but the sum of the squares of any two numbers diminished by twice their product will equal the square of their dift'erence;. and .'. 25^ equals the sum of their squares^ and 300 is their product. . •.i/252+300X2=v^ 625+600=i^T;225=35= their sum, but V' 625=600= v'SS-S^their difference. We now have the sum and difference of two numbers to find the numbers, .-. 35+5=40 : 40-2=20=one side. 35-5=30 : 30-2=l5=one end. Id. 163. If a heavy sphere, whose diameter is 4 inches, be dropped into a conical glass full of water, whose diameter is 5 inches and altitude 6 inches, how much water will run over ? Solution. Let the diagram represent the ball and glass. (B E=6 inches. E C=J A C=2.5 inches. Given \ O F=0 s^=0 M=2 inc hes. B C=i/E B^+E C2=v/62+2.52=- [6.5 inches. I NOTES AND QUERIES. 103 The triangles B E C and B F O are similar, for they are right angled at E and F and have the common angle B. Hence E C : O F : : B C :B 0,or2.5 : 2 : : 6.5 : 5.2. E 0= B E-B 0=6-5.2= .8. EM=OM+OE =2+.8=2.8 inches= altitude of the seg- ment M F s' s. E s' =i/0 s' 2_o E^=t/2^ -.S'=VSM. Now the quantity of water that runs over is equal to the volume of the segment s s' F M. The geometrical formula for finding the solidity of the segment s s' F M may be thus ex- pressed. Multiply the square of the height plus three times the square of the radius of the base, by the height, and this product by .5236. Height=2.8 in., the square of which=7.84. Radius of ba8e=T/3.36, the square of which is 8.36, and three times the 8quare=10.08. . • . (7.84+10.08)X2.8X.5286=26. 2721536 cu. in. Ans. H. A. Withee. 164. What is the area of a large circle enclosing three equal small circles, the 104 NOTES AND QUERIES. curvilineal space between the small circles bein^ one acre ? Solution. Let R represent the radius of these equal cir- cles ; then it is obvious that each side of this A is equal to 2R. The triangle is therefore equi- lateral, and it en- closes the given area, and three equal sectors. As the angle J of two right angles, are, together, equal to a semi-circle. But the area of a semi-circle, whose radius is K, is expressed ttR' by -o- ; and the area of the whole triangle must be -^ — ("160; but the area of the A is also equal to R multiplied bythe per- pendicular altitude, which is Ri/3. Therefore RV3=— r- fl60. of each sector is the three sectors Or, R2 = 2 R2(2i/3-^)=320. 320 320 2v/ 3-3.1416 0.3225 992.248. NOTES AND QUERIES. 105 Hence, E=31.48+rods. To find distance from A, B or C to cen- ter of large circle, use the following rule: Divide the product of the three sides by 4 times the area of the A. (31.48X31.48X31.48)-(v/ (31.48X2)2+31.482 X31.48X4=36 2+=distance from A, B or C to center of large circle. Diameter of large circle=(31 48+36. 2)X [2=67.68 rods. Area of large circle=67.68'^X.7854= [3597.59— sq. rds. or 22A. 77.59-sq. rds. Jerome Erdley, Middleburgh, Pa. 165. How many feet of lumber in a piece of timber 8 inches square at one end and 12 inches at the other, and 45 feet long. Solution. Rule. — To find the contents of a frustrum, take the sum of the two bases and the square root of their product, and multiply the sum by one-third of the alti- tude of the frustum. Area = 8^ + 1 22+/'¥2 Xi22-I44sq. in. X(iX 45)^64+144+96- 144 X 15=31| cubic ft. „ Id. 12 In, 8 In. 106 NOTES AND (,)L'h:KIES. 106. A man agreed tu work a year for a horse and $180. At the end of tlie fifth month, by equitable settlement, he received the horse and $5. What was the value of horse? Solution. He received the value of the horse and |180 for 12mo. labor. He also received the value of the horse and |5, for 5mo. labor. .-. for 12 — 5 or 7mo. labor he received $180— $5=^$175, and for 1 mo. labor he re- ceived 4- of |175=$25. .-. the value of the horse =(5X$25)— $5 =$120. Id. 167. A farmer lost 10 ^^o of his wheat crop, but if it had copt him $50 more, his loss would have been 20%. What was the cost of his crop ? Solution. 10 %=Yo ^^ cost=lo8s. T^—A= Abseiling price. 20%=|- ot 2d cost=^second loss. I — ^=|- of second cost=second S. P.= [100—10 or 90 '/o of first cost. i=90HESS '^ E. SHERRILL, . . Publisher, DANVILLE, INDIANA. LIBRARY OF CONGRESS EMOR -OF Pi C11Q 741 19:^ R POETRY AND PROSE. By will p. hart, M. S., Price, 20 Cents, (will be issued june 1, 1890.) This little volume is ^o. 3 in the Knickerbocker Library Series. It is made up of several hundred of the best selections from all the brst writers of the world suitable for memorizing and quoting on special occa- sions. It has been compiled to supply a demand for such a book in the public schools. It is intended as a hand-book for the teacher and pupil. A certain time each day— say at the morning exercises, or at least once a week, should be devoted to the reciting of " Memory Txems. ' The teacher should encourage each pupil to memorize and .recite one of the selections at every .'xercise, giving the name of the author. In this way the pupil Will gradually learn to admire the beautiful in iinguage, and to discriminate between classic and jnediocre writing. Only the best selections from the hest authors have been given, and great care has been (jxercistd to make them accurate. Two complete in- «i. x^s htive been added, one of authors quoted, and another ot quotations Place this little book of " Mem- cry Oems" in the hands of your pupils, and wake up your dull, prosy school. Write at once and get our lihenil terms for first introduction into schools bv the quantity. '' ADDRESS J. E. SHERRILL, . . Publisher, DANViTiLE, INDIANA.