Thickness in parts of an inch.

Wrought iron.

Copper.

Lead.

1-32

.326

11½

lbs. plate

.38

2 lbs.

lead

•483

1-16

.653

23½

.76 .

4

"

•967

3-32

.976

35

114

5½

"

1.45

1-8

1.3

46½

1.52

8

"

1.933

5-32

1.627

58

1.9

9¼

"

2.417

3-16

1.95

70

2.28

11

"

2.9

7-32

2.277

80½

2.66

13

"

3.383

1-4

2.6

93

304

15

"

3.867

Rule. - To the interior diameter of the pipe, in inches, add the thickness of the metal; multiply the sum by the decimal numbers opposite the required thickness and under the metal's name; also by the length of the pipe in feet, and the product is the weight of the pipe in lbs.

1. Required the weight of a copper pipe whose interior diameter is 7½ inches, its length 6¼ feet, and the metal 1-8 of an inch in thickness.

7.5 + .125 = 7625 X 152 X 625 = 724 lbs.

2. What is the weight of a leaden pine 18½ feet in length, 3 inches interior diameter, and the metal ¼ of an inch in thickness?

3 + .25 = 3.25 X 3.867 X 18.5 = 232.5 lbs.