226 



Commercial Gardening 



the length, width, and depth are multiplied together. Thus, 1 cub. ft. 

 = 12 in. by 12 in. by 12 in. = 1728 cub. in. 



An acre of soil contains 43,560 sq. ft., and at 1 ft. deep is considered to 

 weigh on an average 3,000,000 Ib. Therefore 1 cub. ft. of soil weighs on 



3,000,000 , 



an average ' _' = 69 Ib., nearly. 1 cub. yd. or soil weighs about 



1863 Ib. = 16'6 cwt. In practice it is reckoned as 1 ton. 



In applying these figures to well-known things in gardens and nurseries 

 the following examples may be taken. 



Water tanJcs. In square-built tanks the length by width by depth 

 equals cubic contents. Each cubic foot by 6| 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 = 450 gal. = 4500 Ib. 



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 Ib.: 



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 4'8947 = 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 



