THE "WISCONSIN" SILO. 



43 



Fig. 4. Showing the method of ventilating between studding. An 

 auger hole is bored through the outer siding just above sill, 

 between each pair of studding as at X, and a screen nailed 

 over hole inside to keep out mice. A similar hole is bored 

 through the inner sheeting between each pair of studs at the 

 top of the silo just under the plates, as at W. Auger holes are 

 used at X and W, so that the holes may be closed in cold 

 weather with corks. 



