Rule. - Multiply the diameter of the base by itself, and this product by the height, then take one-third of this product for the contents; to obtain gallons, divide the last result by 231.

Example. - Required the cubic inches of a Cone whose base is 8 inches diameter, and height 18 inches.

8X3 = 64X18 = 1152 ÷ 3 = 384 cubic inches, ÷ 231 = 1 gall. 2¾ quarts.

To Find The Solidity of a Pyramid or Cone.

Rule. - Multiply the area of the base by the height, and one-third of the product will be the solid content.

Example.-Required the solid content in inches of a Cone or Pyramid, the diameter of the base being 8 inches, and perpendicular height 18 inches?

8X8 = 64 X .7854 X 18=904.7808 ÷ 3=301.5936inches÷231 = 1 gall, 1¼ qts. Page 92 No. 38.-For Tin 64 lbs. Copper 1 lb. read Copper 64 lbs. Tin 1 lb.