September 1, 1917.] 



THE INDIA RUBBER WORLD 



709 



Bowers' Specific Gravity Tables. 



IN the August issue of The India Rubber World the Bovvers' sample. 

 table for computing the approximate weights of disks was One gross 6 iuch A. S. M. E. gaskets, 3/16 inch thick. Specific Gravity 1.62, 



1 1- u J ■ J 11 I 1 I I • .11 11 inch diameter, 6 inch hole, 8 % inch bolt holes on 9!^ inch bolt 



published in full and also several samples were given to lUus- circle— (Kent 1916 Edition, page 209). 



trate the method to be followed in making computations. The ,- 



. ^ ^ Computation. 



table for cylinders that follows is used in determining the weight 11 inch diameter = 4!. 19808 pounds 



of cylinders such as typewriter platens, tubes, bands, springs, * '""^"^ '^"'^ — 12.25728 



tubing, made on a tubing machine or by hand, cylindrical cover- 28.94080 



ings for shafts and paper mill rolls. The range of the table is ^ "%, ||o6s''' '"'" *'°'" = 2.08544 



from 1/64 inch to 3 inches for cylinders of customary measure- ^TTTTTTT 



26.85536 



ments. 144 X 3/16 inch = 2.25 feet 



CYLINDER TABLE. ni^Tlio 



The stated base of the cylinder table is 62.4256 + pounds per 5371072^ 



cubic foot. — ^ — 



The unit used is .00133 ounce equals a cylinder 1/64 inch " 1.62 



diameter, one foot long. Specific gravity 1.00. 1^08490 '00 



.00132996 ounce X (12 X 64)= 3625470600 



— <;-> !.-<; , J 604245100 



■ — 62.42o6 + pounds. 



.7853982 X 16 97.887706200 or 



^ '" 97?^ pounds per gross 



Weight of one cubic foot of water 39.1 degrees F. (maximum sample 



density) =62.425 pounds. (Kent, 1916 edition, page 27. ) -r„i ,„ i/i< ■ u ;, i wi^ • u n c -c r- ■ , „, 



' , ,. , 1, . • f a Juhing — 3/16 n:ch hole, 1/16 inch wall. Specific Gravity 1.83. 



To convert the cylinder table into weights according to above Comput.^tion. 



standard multiply by 0.9999 -^- or divide by 1. 00001 ±. 3/ J 6 inch = :i9?52 °"""' 



The cylinder table is constructed to read from 1/64 inch ^ _ 



diameter up, in the same manner as the disk table: 1.83 



1/64 inch to 3 inches by 64ths in ounces 102144 



1/32 inch to 6 inches by 32nds in ounces 272384 



1/16 inch to 12 inches hy 16ths in pounds 34048 



J^ inch to 24 inches by 8ths in pounds 



,,,,,. , . ,i„^', '^^"^'■^ .6230784 ounces 



1 1/64 mch = 5.61925 ounces or 4 pounds light per 100 feet 



2 4 



2 1/32 inch = 22.47700 ounces _ ,. , SAMPLE. 



2 4 Cylinder — 6 inch diameter, 5 inch hole, Specific Gravity, 1.68. 



Computation. 



4 1/16 inch = 89.90800 ounces = 5.61925 pounds 6 inch = 12.25728 pounds 



2 4 5 inch = 8.51200 



Sli inch = 22.47700 pounds 3.74528 



2 et cetera 4 1.68 



16 54 inch = 89.90800 pounds 2996224 



The variation between the weights of a cylinder one foot 374528 



diameter, one foot long, specific gravity 1.00 determined from ^ ,neh°='l!^ inch read in pounds 6.2920704 pounds 



the disk or cylinder table is as follows: 5 inch = i;4 inch read in pounds or 6<A pounds per foot 



Cylinder table 49.029120000 pounds 



Disk table 49.007296512 pounds SAMPLE. 



Difference ""wm823488 pounds ''°" Gra"vity,'^.?3".'''"'^ diameter, 96 inch face on 10 inch shaft, Specific 



The combined use of both the disk and cylinder tables in one Computation. 



calculation will be found convenient, practically accurate results jj |"^[j = ttoUoo ''°"'"'' 



will be obtained. 



1 4 QR 1 1 '? 



The volumes of two similar solids are to each other as the ' g f^^j 



cubes of their linear dimensions. (Kent, 1916 edition, page 62.) 84896 



To determine the weights per gross of washers and kindred 1.73 



articles, the combined use of the following factors and tlie cylin- 3595468i 



der table will simplify the calculations : 11984896" 



144 disks one inch diameter 1 cylinder one inch diameter ,„ Note: _ .. 



1/64 inch thick = 3/16 foot long 12 inch = 3 inch read in pounds 207.3387008 pounds 



1/32 inch thick = Vs foot long 10 "K^h = 2^ inch read in pounds or 207 54 pounds finished weight 



1/16 inch thick = ^ foot long 



<A inch thick = 1 !4 feet long ca-u-ot-c' 



Vi inch thick = 3 feet long SAMPLE. 



et cetera Koll — 45 inch finished diameter, 72 inch face on 4 2 inch shell. Specific 



SAMPLE. Gravity 1.85. 



-,, , , ,^ - , J. 1 . , , 1 . - T 1 - 1 c* -c f ■. 1 cA Computation. 



Washers — IK inch diameter, 1 inch hole, Vi incli thick. Specific Gravity, 1.50. .„ . , ... 



, r- 45 inch = 689.47200 pounds 



Computation. 42 j^^,, _ 600.60672 



114 =; 12.25728 ounces _ 



1 — 5.44768 88.86528 



6 feet 



6.80960 



144 X y^ inch = 3 feet 533.19168 



1.85 



20.42880 — — 



1.50 266595840 



426553344 



1021440UO 53319168 



2042880 Note: 



45 inch = 16 X 2 13/16 inches In pounds 986.4046080 pounds 



30.6432000 ounces per gross 42 inch = 16 X 2% inches in pounds or 986 pounds finished weight 



