Set the length upon B to the gauge-point upon A; and against the side of the square, or diameter on D, are (he cubic contents, or weight in lbs. on c.

1. Required the cubic contents of a tree 30 feet in length, and 10 inches quarter girt.

Set 30 upon b to 144 (the gauge-point) upon a ; and against 10 upon D is 20.75 feet upon c.

2. In a cylinder 9 inches in length, and 7 inches diameter, how many cubic inches?

Set 9 upon b to 1273 (the gauge-point) upon a; and against 7 on d is 346 inches on c.

8. What is the weight of a bar of cast iron 3 in. square and 6 ft. long?

Set 6 upon b to 32 (the gauge-point) upon a; and against 3 upon d is 168 pounds upon C.