78 



SILOS: CONSTRUCTION AND SERVICE 



T/3BLE 



or 



Fig. 24. Reinforcing 



that the door frame 

 consists of inter- 

 locking steel, thor- 

 oughly set in ce- 

 ment, which locks 

 it, protects it from 

 rust, and secures it 

 in an air-tight man- 

 ner to the hollow 

 blocks of the wall 

 by running into 

 them a short dis- 

 tance. 



Construction of 

 the Door Forms. 

 ^ A detailed drawing 

 4> of these forms, two 

 of which are re- 

 quired, is shown in 

 Fig. 26. The up- 

 per left-hand view 

 shows the eleva- 

 tion; the upper 

 right-hand view 

 shows the form as 

 seen from the side, 

 while the lower 

 plan view presents 

 the form as seen 

 from above. 



One method of 

 procedure in the 

 construction of a 



