326 ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 



several, and a convenient method of construction has been de- 

 veloped for the same. In case a wooden roof or any other kind 

 of a roof is desired, a plate made up of two thicknesses of i-inch 

 lumber sawed to the proper curvature may be bolted down to the 

 upper course of blocks. 



One of the first considerations is the pitch of the roof. The 

 first Iowa silo built was covered with a % pitch roof. This gave 

 only four feet of head room under the roof at the center for a 

 man to work when finishing the filling of the silo. Roofs put on 

 with a 1-3 pitch seem considerably more satisfactory both in out- 

 ward appearance and in the amount of head room secured be- 

 neath. 



