Thirty-fourth Annual Convention. 



239 



during dry weather when the silo is empty, and unless the hoops 

 are tightened there is a possibility of the silo being racked or 

 blown over. If the hoops are tightened when the staves are di-y 

 there is then danger of the hoops bursting when the silo is filled 

 and the staves again become saturated with moisture. An ex- 

 ample of this came under the writer's notice recently, when the 

 second morning after a silo was filled the owner found half the 

 hoops had burst. It will be noticed in the illustrations of stave 

 silos that where they had been put up for any length of time the 

 staves had shrunk, allowing the hoops to drop from their original 

 position. A stave silo is usually much more satisfactory if a 

 building is built over it for protection, but this makes it expensive. 

 Cut 32 shows a stave silo recently built. This silo is 16 feet 

 in diameter, 34 feet deep, and has a capacity of 150 tons. The 

 foundation, which extends two feet into the ground, is a brick wall 

 that was laid up by the owner. The silo was built by two car- 

 penters in nine days, at $2.50 a day each, making $45 paid out for 

 labor. The lumber cost $80, the iron hoops $20, and nails and 

 spikes $2. There being no roof, the silo above the foundation 



Cut 31. — Stone Silo 20 Feet in Diameter and 32 Feet Deep; Capacity 

 204 Tons. Cost Nearly $700. 



