740 



IOWA DEPARTMENT OF AGRICULTRUE 



I 



r '^" 



- 8" 

 -4" 



Detail °^OPEr^i^iG 



Cut 10.— Showing- Construction of Door and Door Frame. 



ing against the clay to resist the great outward pressure of the silage. 

 Where the clay is solid a two-inch brick wall is quite sufficient. Three 

 feet from the bottom and within one foot of the top of the ground the 

 wall was thickened to eight inches and carried up six inches above the 

 grade line. Where the grass is not kept down around the silo the brick 

 wall should be higher to protect the wood from dampness. 



When a silo is placed in the ground, unless there is good natural 

 drainage through the subsoil, tile must be laid to drain the bottom or 

 difficulty is almost sure to be experienced with water in the pit. 



The wall of this silo should have been strengthened by imbedding 

 an iron hoop in it just above the ground, for an eight-inch brick wall 



