EXPERIMENT STATION BULLETINS. 



239 



the ground and about 26 feot above ground. When well filled it holds 

 about 90 tons of ensilage. 



This silo was built in the summer of 1905. 



The wall is 10 inches thick from the ground to plate. 



The openings for the doors are 24 inches wide and 36 inches high. 



Fig. 27. Solid wall cement silo, built in 1905. 



and are 2 feet apart. Only the top opening carries a frame. Each of 

 the other openings carries a shoulder sufficiently deep, moulded into 

 the inner side of the wall, to carry a door of 1-inch material flush with 

 the inside wall. This door, made of inch material (flooring in this case) 

 held together by cleats is set in place in the doorway, and against 

 the inner side is placed, in the same manner as in the other silos, a 

 piece of galvanized sheet iron sufficiently large to lap two inches be- 

 yond the doors, thus preventing the passage of air through and about 

 the door. 



In building that part of the wall below ground a circular trench 



