164 Concrete Silos 



The method of operation of this roof is well shown 

 in the illustration. It has a metal roof consisting of 

 separate segments which are hinged at the bottom and 

 can be opened until they stand vertical. When they are 

 opened for filling the silo the spaces between the seg- 

 ments are protected by wire mesh. 



Buckeye Silo Roof. This is a sheet metal roof, made 

 in gambrel design with dormer window. It is made by 

 the Thomas & Armstrong Company, London, Ohio. The 

 same company also makes all-steel silo doors, and other 

 silo equipment. 



Air-Tight All, Steel Door Frame. This is a continu- 

 ous door manufactured by the Silo Specialty Manufac- 

 turing Company at Clinton, Iowa. This is an inflexible, 

 unbreakable, steel door frame, requiring no packing to 

 make a tight door. 



