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The weights here given, are in pounds, ounces, and decimal parts, avoirdupois; and it will be seen, on inspecting the Table, that the first numbers in each page are those which apply to nut iron, and that the breadth increases by of an inch as far as page 86, after which they rise by of an inch in breadth to the end. The last numbers in each page show the weight of a square foot, according to the respective thickness of each bar. Hence the weight of any length of a bar of rectangular iron may be ascertained simply, as follows:

Rule.-Multiply the tabular weight, according to the thickness and breadth, by the number of feet in the bar, the product will be the weight required.

Example. In a bar of iron whose thickness is 2ğ inches, the breadth 62 inches, and the length 18 feet, what is the weight thereof?

In the Table for 2 inches thick, and opposite 63 inches, stand 2qrs. 2fbs. 10.9oz., being the weight of one lineal foot. Multiply this number by 18 feet, and we have as follows:

cwt. qrs. lbs. oz.

0 2 2 10.9

6 x 3=18

3 0 16 14

3

1 20 4.2 Answer.

The foregoing Table of weights is obtained by the following approximate rule:

Multiply the area of the end of the bar by the length of one foot, and multiply that product by 3.32, the product will be the weight in pounds avoirdupois, nearly.*

By this rule the weight of any length of malleable rectangular iron may be ascertained nearly.

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