Concrete Silos 



129 



silage. The two men it is stated will cast these in 4% 

 days. They are then left 4 or 5 days to cure before 

 being erected. 



Playford Cement Stave Silo. This system is con- 

 trolled by the Cement Stave Silo Company, Des Moines, 

 Iowa. These staves are made 30 inches long, 10 inches 

 wide and 2% inches thick. One edge is concave and 

 the other convex, so that the staves fit closely to- 

 gether, no matter what the radius of the silo and the 

 consequent curvature of the walls. In building a Play- 



Playford Silo With Door Spreaders 



Chute. 



ford Silo the first row consists of alternate full and 

 half length staves; thus the joints are broken the 

 entire way up, and the last row finished with alter- 

 nate full and half lengths. These silos when erected 

 are held together with hoops of round steel joined 

 with patent lugs. These hoops are put on as the silo 



