Br. and Th. Weight. inch. lbs. Br. and Th. Weight. Br. and Th. Weight. Br. and Th. Weight. inch. lbs. inch. lbs. inch. lbs. 4 by 238.020 43 by 3 48.158 51 by 13.307 5 by 2 37.175 2341.822 3152.172 356.185 3449.426 5 by 4.224 1 17.743 1122.178 2346.469 3 55.762 126.614 5 by 44.858 8.449 13 31.049 9.716 8.026 12.040 1 16.053 1420.066 124.079 13 28.092 2 32.106 2136.119 3 46.469 3 58.297 The weight of a SQUARE FOOT one inch thick of And for any other thickness, greater or less, it is the same in proportion; thus, a square foot of sheet copper of an inch thick 46.24 162.89 lbs. And 5 square feet at that thickness 2.89 514.45 lbs., &c. So, too, 5 square feet at 2 inches 46.24 × 2.5 X 5578 lbs. thickness: THE AMERICAN WIRE GAUGE. The American Wire Gauge was prepared by Messrs. Brown and Sharp, manufacturers of machinists' tools, Providence, R. I. It is graded upon geometrical principles, is rapidly becoming the standard gauge with manufacturers of wire and plate in the United States, and cannot fail to supersede the use of the Birmingham Gauge in this country. TABLE Showing the Linear Measures represented by Nos. American Wire Gauge and Birmingham Wire Gauge, or the values of the Nos. in the United-States Standard Inch. 8.12849 .165 0000.46000.454 19.03589.042 30.01003.012 Thus the DIAMETER or size of No. 4 wire, American gauge, is 0.20431 of an inch; Birmingham gauge, 0.238 of an inch: so the THICKNESS of No. 4 plate, American gauge, is 0.20431 of an inch; Birmingham gauge, 0.238 of an inch; and so for the other Nos. on the gauges respectively. TABLE Showing the Number of Linear Feet in One Pound, Avoirdupois, of Different Kinds of Wire; Sizes or Diameters corre sponding to Nos. American Wire-gauge. NOTE. In this TABLE the iron and copper employed are supposed to be nearly pure. The specific gravity of the former was taken at 7.774; that of the latter, at 8.878. The specific gravity of the brass was taken at 8.376. To find the number of feet in a pound of wire of any material not given in the TABLE, of any size, American gauge, its specific gravity being known. RULE. - Multiply the number of feet in a pound of iron wire of the same size by 7.774, and divide the product by the specific gravity of the wire whose length is sought; or ordinarily, for steel wire, multiply the number of feet in a pound of iron wire of the same size by 0.991. To find the number of feet in a pound of wire of any given No., Birmingham gauge. RULE. - Multiply the number of feet in a pound of the same kind of wire, same No., American gauge, by the size, American gauge, and divide the product by the size, Birmingham gauge. EXAMPLE. In a pound of copper wire No. 16, American gauge, there are 127.94 feet: how many feet are there of the same kind of wire, same No., Birmingham gauge ? (127.94 .05082).065 100.03. Ans. To find the weight of any given length of wire of any given No. or size, American gauge, or the length in any given weight, by help of the foregoing TABLE. - Required the weight of 600 feet of No. 18 iron 600 — 232.34 — 2.5822 lbs. = 2 lbs. 93 oz., nearly. Ans. EXAMPLE. Required the length in feet of 2 lbs. of No. 31 brass wire. NOTE.To alloys of copper and zinc, generally, there is added a small quantity of lead, which renders them the better adapted for turning, planing, or filing; and, for the same reason, to alloys of copper and tin, there is usually added a small quantity of zinc (see ALLOYS AND COMPOSITIONS), Thickness. Iron. No. TABLE Showing the Weight of One Square Foot of Rolled Metals, thickness corresponding to Nos., American Wire-gauge. Lead. Zinc. Pounds. Pounds. Pounds. Pounds. Pounds. Pounds. Steel. Copper. Brass. NOTE.-In calculating the foregoing TABLE, the specific gravities were taken as follows: viz., iron, 7.200; steel, 7.300; copper, 8.700; brass, 8,230; lead, 11.350; Zinc, 7.189. |