Table 119.-WEIGHT OF 12 INCHES SQUARE OF BESSEMER STEEL, AND ROLLED STEEL SHEETS, AND GUN METAL PLATES; THE THICKNESS BEING MEASURED BY THE NEW IMPERIAL STANDARD WIRE-GAUGE. Table 120.-WEIGHT OF 12 INCHES SQUARE OF ROLLED WHITE METAL, LEAD, AND ZINC SHEETS; THE THICKNESS BEING MEASURED BY THE NEW IMPERIAL STANDARD Wire-Gauge. * For the equivalents in decimal parts of an inch of the numbers of the wire-gauge, see page 331. U 2 Table 121.-WEIGHT OF 12 INCHES SQUARE OF VARIOUS METALS. Hoops. To find the length of bar required to make a circular hoop.— Rule: Add the thickness of the bar to the inside diameter of the hoop, and multiply the result by 34. For angle-iron hoops, with the flange on the outside.-Rule: Add twice the thickness of the root to the inside diameter of the hoop, and multiply the result by 34. For angle-iron hoops with the flange inside the hoop.-Rule: Deduct twice the thickness of the root from the outside diameter, and multiply by 34. Table 122.-IRON WIRE. The following Table, issued by the Iron and Steel Wire Manufacturers' Association, gives the sizes, weights, lengths, and breaking strains of iron wire, according to the New Imperial Standard Wire-gauge. 1Ο 128 373 3' 183 2.3 14 *080 2' *0050 54 5° 0129 12'7 223 882 300 687 1077 564 1030 ΙΟ 1234ino Não ao 5 7 2240 268 4' 16 *064 16 Table 127.-WEIGHT OF CAST-IRON BALLS IN LBS. Balls. To find the weight of balls of other metals: multiply the weight of cast iron balls by 12 for gun metal; 1'15 for brass; 108 for steel; and by 105 for wrought-iron. Wood Screws.-GAUGE NUMBER, AND DIAMETER IN DECIMAL PARTS 15 Length Thickness Weight Thickness Weight Thickness Weight Thickness Weight in per in per in per in per 18 24 28 36 42 70 84 11001100 500 +000N 3 18 22 25 30 36 72 31/ IO 16 200 5 ΙΟ b 16 234 6 ΙΟ 5 330 NOTE.-F means full, and B bare thickness. |