Concrete Silos 



135 



The first mentioned is a hand mold, open at top 

 and bottom and designed to rest on a pallet and be 

 withdrawn after the concrete is 

 tamped in and struck off; the 

 other is a machine somewhat 

 similar to a concrete block or 

 brick machine, in which the 

 operations are done more rap- 

 idly by mechanical means. 

 Both outfits are provided with 

 means for making fractional 

 staves as needed. 



A mold for casting a sec- 

 tional concrete door frame is 

 also a part of each outfit. This 

 door frame is the same height 

 as a stave, 28 inches, and 40 

 inches wide, taking the place 

 of four staves; it also is pro- 

 vided with one concave and 

 one convex edge to fit into 

 adjoining staves. It thus can 

 be used continuously or inter- 

 mittently as desired. The door 

 frame has an opening of 28x20 inches, with an offset 

 to accommodate a wood door. 



Swan Stave System. This design of stave was orig- 

 inated by the Swan Concrete Stave Silo Company, 

 Cassopolis, Michigan. It is a dry tamp stave made in 

 a simple form on wood pallets, the pallets being curved 

 to the radius of the silo. The staves are dovetailed 

 on the ends and each stave also has a tongue on one 

 side and top and a groove on the other side and the 



Interlocking Cement 

 Staves. 



