OTHER FORMS OF ROUND SILOS. 69 



To And the area of a circle, multiply the square of the 

 diameter by 0.7854. 



To find the cubical contents of a cylinder, multiply the area 

 of the base (floor) by the height. 



Example. — A silo 16 feet in diameter and 26 feet high is 

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

 will be the feeding area in the silo and its capacity? 



The circumference of a circle 16 feet In diameter is 50.3 feet; 

 there will therefore be required 50.3 X% =101 staves, 2x6 inches, 

 26 feet high, or if staves of this height cannot be obtained, 135 

 staves 20 feet long, or 50 each of 12 and 14 feet long staves. 

 The feeding area will be 16X16X0.7854=201.1 square feet, and 

 the cubical contents of the silo, 201.1X26=5228.6 cubic feet. Es-. 

 timating the weight of a. cubic foot of corn silage at 40 pounds, 

 5228.6 cubic feet of silage would weigh 209,164 pounds, or about 



Fig. 23. — Showing method of bedding iron rods in stone, brick, or 

 concrete walls, to increase the strength. The ends of rods 

 should be firmly linked together as shown. 



