General Rule. - Set the length upon B to the gauge point upon a; and against the side of the square, or diameter on D, are the 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.

3. What is the weight of a bar of cast iron 3 in. square, and 6 fl. long? Set 6 upon b to 32 (the gauge-point) upon a; and against 3 upon D is 16S pounds upon c. By the common ride.

4. Required the weight of a cylinder of wrought iron 10 inches long, and 54 diameter.

Set 10 upon B to 283 (the gauge-point) upon a; and against 5½ upon D is

66.65 pounds on c.

5. What is the weight of a dry rope 25 yards long, and 4 inches circumference?

Set 25 upon B to 47 (the gauge-point) upon a; and against 4 on d is 53 16 pounds on c.

6. What is the weight of a short-linked chain 30 yards in length, and 6-16ths of an inch in diameter?

Set 30 upon b to 52 (the gauge-point) upon a; and against 6 on D is 129.5 pounds on c.