PRACTICAL SILO CONSTRUCTION 65 



inside of the silo for the placing of rafters for the 

 roof. This ledge is placed so that it will be even 

 with the embrasures entirely around the parapet, 

 thus enabling the water to be easily carried off from 

 the roof. 



The concrete is filled into mold up to the point 

 where the ledge is placed, then the wood forms for 

 embrasures are set inside the mold at the desired 

 distances apart, and the concrete tamped around 

 same to the top. These wood forms are constructed 

 of three short boards, with the center one, or cross- 

 piece, bored to supply a hold for removing the form 

 from the concrete. The construction of forms is 

 shown at Fig. 18, with the method of placing and 

 filling the form with the concrete. 



