EXPERIMENT STATION BULLETINS. 



241 



S feet of wall is 6 inches thick. The floor is 5 feet below the sill of 

 the lower door and is nearlj^ that much below ground on the barn 

 side. 



There are four doorways, 54 inches apart, sill to sill, which carry 

 doors 24 inches high by 22 inches wide. The two lower door frames 

 are made of a single thickness of 2 inch by 8 inch material; the two 

 upper frames are made of a single thickness of 2xG material. All the 

 frames are built into the wall and all have jambs of lath. 



Fig 4. The noardman solid wall cement silo buill in :9G2, 

 r.ear Jackson, Midi. 



The doors are made of a single thickness of inch material. When 

 filling the silo the doors are set in place, a piece of galvanized sheet 

 iron 26 inches by 28 inches is placed against the inside of each and tacked 

 to the door frame and the ensilage material is filled in against the sheet 

 iron. The sheet iron thus lapping two inches beyond the edges and ends 

 of the doors is held tightly against the door frame and prevents the air 

 from reaching the silage by way of the doorways. 



For the roof, rafters are placed two feet apart on the w^all. 



A dormer window was built as shown in Fig. 4, about 2 feet by 2 feet. 



A galvanized iron round ventilator 1 ft. in diameter and 4 inches high 



was set at the peak. The ventilator lias a roof of the same materials 



31 



