Table 118.-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 119.-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 120.-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 121.-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.

Table 123.-WEIGHT OF I FOOT IN LENGTH OF ANGLE AND TEE-Iron.

THICKNESS Of the MiddlE OF EACH WEB OR FLANGE.

Breadth of
Iron.

Inches.

lbs. I'74

1.86 2.25 2.95

2.30 2.81 330

3.76

x 2

6.48

356 438 519 5'95
328490 5.81

6.70

7:40 S12

6.68

742

5 × 5

61 × 6

7 x7

4'40 543 644
482 595 707 8.15
524 6.48 770 8.90
5.66 700 8.33 963
6.08 7:53 8.96 10 36
6.50 8.06 9.60 1110
6.92 8.58 10 22
733 9 10 10 95
7'75 964 11 48
1015 12 12
11.20 13.36 15:50
12:25 1463 16.98
18.2
8.47
1992

11.83 12:56 13.31 14 04

754 835 916 8.38 9.30 10 21 11'95 9°21 10:25 11:26 13:25 10:06 11:20 12:31 14 50 10.90 12:15 13:36 15'76 11 75 13:08 14'40 17:06 12:56 14:02 15:45 18:30 13.41 14'96 16'50 19'55 14:25 15'92 17:56 20.80 15.10 16.85 18.58 22:08 15 92 17.80 19.63 23°33 17.61 19.67 21.72 25.80 29.84 19:28 2160 23 84 28 30 32 64 36.85 2096 23:46 25'93 30.80 35.52 40 20 22.65 25 33 28.00 33.30 38.45 4352

Table 124.-STRENGTH OF LEAD PIPES.

Table 126.-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; 115 for brass; 108 for steel; and by 105 for wrought-iron.

Wood Screws.-GAUGE NUMBER, AND DIAMETER IN DECIMAL PARTS