134 Concrete Silos 



that the latter cannot slip out of place. The hoops, 

 being held out from the face of the silo by the ribs, 

 form a convenient ladder for climbing up the silo at 

 any point. 



A continuous door system is provided for, special 

 staves being made for the door opening which carry 

 an offset against which the door can rest and also 

 having recesses into which a casting can be slipped 

 as a dividing plate between doors. This casting is 

 held firmly in place automatically when both the up- 

 per and lower staves are in position. The doors are 

 of wood, held in place by latches which are turned 

 over the flange of the castings above and below. 



A galvanized iron roof is usually put on, with a 

 chute either of that material or built up of the staves 

 themselves. 



The staves iare poured of a slush mixture in in- 

 dividual molds of sheet steel and are allowed to re- 

 main in the molds for 24 hours. 



Interlocking Cement Stave Silo. This system, con- 

 trolled by the Interlocking Cement Stave Silo Com- 

 pany, Des Moines, Iowa, has as its most noticeable 

 feature a bevel on the ends of each stave. This irregu- 

 lar form of joint makes it possible for a single band 

 passing around the joint to hold the ends of all staves 

 both those ajbove and those below. Concave and 

 convex edges also provide an additional interlock. 



The staves are 28 inches long, 10 inches wide and 

 2% inches thick. The company makes two types of 

 equipment for the manufacturing of these staves, one of 

 them adapted to the manufacture of small and inter- 

 mittent lots of staves, and tKe other a larger outfit for 

 making larger quantities. Both make identically the 

 same design of product. 



