234 ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 



good roofing material put on top. A properly made door must 

 be left in the roof through which to fill the silo. 



Ventilating the Walls, 



When the silo is covered on the outside in any way other 

 than with hoops and vertical boxing, it is necessary to bore a 

 large auger hole between each stud on the outside at the bottom 

 and on the inside at the top so as to allow the air to circulate 

 through the wall and keep down decay of the woodwork. All 

 holes should be covered with fine mesh woven to keep rats and 

 mice out. 



When hoops and vertical boxing are used, a few large 

 sawed holes about four-by-six inches in size, at the bottom and 

 top will serve, since the air can readily pass between the boxing 

 and the studding. 



Bracing. 



It is necessary to anchor the silo firmly with three or four 

 strong guy wires or cables of short length. These are very 

 valuable in case of windstorms. They are attached to sleepers 

 buried several feet in the ground about four or five feet out 

 from the base of the silo, and run to a point on the studding 

 about half way to the top of the silo, where they are firmly 

 secured. 



