When all the dimensions are in feet : Rule. Multiply the breadth by the depth and that product by the length, and the product will give the volume in cubic feet.

When either of the dimensions are in inches : Rule. Multiply the length, breadth and depth and divide by 12.

When any two of the dimensions are in inches: Rule. Multiply the length, breadth and depth and divide by 144.

To Measure Round Timber take the girth in inches at both the large and small ends, add them. divide by two, which gives the mean girth; then multiply the length in feet by the square of one-fourth of the mean girth, and the quotient will be the contents in cubic feet. This rule is commonly adopted, and gives four-fifths of the true contents, one fifth being allowed to the purchaser for waste in sawing.