196 FARM ARITHMETIC. 



silos, one a round silo 15 feet in diameter and 28 feet 

 high, and the other a square silo 15 feet square and 28 

 feet high? 



708. A round silo 20 feet in diameter and 30 feet high 

 holds a certain quantity of .silage. What shall be the 

 diameter of another silo of same height, that will hold 

 twice the quantity of silage ? 



709. What should be the diameter, that three times 

 the quantity may be held ? 



Staves required for round stave silo. Staves used in 

 silo construction vary in length, width, and thickness. The 

 best length of stave is the height of the silo. If this is 

 not possible, two lengths, one long and one short, may be 

 used. The break should be distributed at different 

 heights. The best widths are 6 or 8 inches ; the best thick- 

 ness, 2 inches, although 3 inches is often used. 



710. A silo 16 feet in diameter and 26 feet high is 

 wanted. How many staves, 2x6 inches, will be needed? 



Process : Divide the circumference by the width of stave. 



Circumference of a circle = diameter X 3.1416. 



16 X 3.1416 = 50.26 feet, circumference. 



6 inches = V-2 foot in width. 



50.26 -r- Y* = 100.52 staves. 



711. A silo 20 feet in diameter and 24 feet high is 

 wanted; how many staves, 2x6 inches, will be needed? 



712. A silo 20 feet in diameter and 26 feet high is 

 wanted; how many staves, 3x8 inches, will be needed? 



713. A silo 18 feet in diameter and 36 feet high is 

 wanted. Because of the height it is necessary to set the 

 staves in two lengths. How many staves, 3x8 inches and 

 20 feet long, will be required, provided all the pieces are 

 used in building the silo ? 



