In square-built tanks the length by width by depth equals cubic contents. Each cubic foot by 6 1/4 equals number of gallons in tank. Thus a tank measuring 6 ft. long, 3 ft. wide, and 4 ft. deep contains 72 cub. ft., and 72 x 6 1/4 = 450 gal. = 4500 lb.

The following table gives the more exact number of gallons in square tanks, according to their dimensions - 1 gal. of water being reckoned at

6.232 lb.: -

Number Of Gallons In Square-Built Tanks

To find the contents in gallons of circular tanks or wells it is necessary to square the diameter, multiply by the depth, and then multiply the result by 4'8947. Thus, a circular tank with a diameter of 4 ft. and a depth of 3 ft. would be measured thus: The diameter squared = 4 x 4 = 16. This multiplied by the depth = 16 x 3 = 48; and 48 x 48947 = 234.946 or say 235 gal.

The volume in cubic feet of a cylindrical tank, prism, or parallelepiped equals area of the base by height or depth. The area of the base equals the diameter squared x .7854. Therefore the volume of a circular tank with a diameter of 4 ft. and a depth of 3 ft. is found thus: Area of base = 4 x 4 x .7854 = 125664 sq. ft. Volume = 125664 sq. ft. x 3 ft. = 37.6992 cub. ft. Reckoning each cubic foot equals 6 1/4 gal. of water, the number of gallons in the tank = 37.6992 x 6.25 = 23662 gal. The following table gives the number of gallons contained in circular tanks or wells of various dimensions: -