Table 5

 Size. Inches. Grade. Sheets in Box. Lb. in Box. 14x20 IC 112 113 29 14x20 IX 112 143 27 14x20 IXX 112 162 26 14x20 IXXX 112 182 25 14x20 IXXXX 112 202 24 20x28 IC 112 224 29 20x28 IX 112 280 27 20x28 IXX 112 322 26

Terne Plate.

 14x20 IC 112 112 29 14x20 IX 112 140 27 20x28 IC 112 224 29 20x28 IX 112 280 27

65. The following table shows the length and diameter of leader pipes made from stock sizes of tin, and the length of pipe that may be made from 1 box of tin:

Table 6

 Sheets. Boxes. Diameter of Pipe inInches. Number of Sheets. Size ofSheets inInches. Length of Pipe in Feet and Inches. Number Sheets in Box. Length of Pipe in Feet. 6 1/5 1 14 x 20 1' 1 1/2" 112 126 4 1/3 1 14 x 20 1' 7 1/2" 112 181 4 2 14 x 20 3' 3" 112 182 3 1/8 1 14 x 20 2' 3" 112 252 2 1/2 1 14 x 20 3' 4 1/2" 112 378

If, for example, the leader pipe is to be 4 inches in diameter, and the circumference 12 1/2 inches, it is plain that only one length can be had out of the 14 in. X 20 in. Allowing 1/4-inch lap for each joint at top and bottom, and using two sheets for a length of pipe, we have 20 in. X 2 - 1 in. = 39 inches, or 3 feet 3 inches; and 39 in. x 56, half the number of sheets in a box, gives 182 feet, the length of leader sections that may be constructed from 1 box.

66. The following table gives length of semicircular eaves gutters that may be made from 1 box of tin: