THE IOWA SILO 



79 



Fig. 25. Concrete roof construction. 



set of these forms is as follows, each part being designated by 

 letters and dimensions shown in the drawing. All surfaces 

 coming in contact with cement should be dressed. First, two 

 members, A, may be cut and pieces, lettered C, may be 

 made from a 2x6. The edge nailed to B should be beveled so 

 that the piece will be flared in order that it may be easily re- 



