BUILDING THE SILO. 319 



to and a little lower than the bottom of the same. 

 The ground should also slope away somewhat from 

 the outside of the wall. 



The Floor. The floor in the stone silo may be 

 similar in construction to that in the stave silo. (See 

 Page 282 and also Page 299.) 



The Walls. The thickness of the walls should 

 be determined by the size of the silo. The larger 

 the silo the greater the pressure, and the greater the 

 pressure the thicker should be the wall. It is at least 

 questionable if the wall of any stone silo should be 

 less than fifteen to eighteen inches in thickness, and 

 the necessity will probably seldom arise for making 

 the wall more than twenty-four inches thick. 

 Whether the wall with an air space or the solid wall 

 with a brick lining inside will be the more efficacious 

 does not appear to have been determined as yet. In 

 southern climates where the danger from frost does 

 not exist, the solid wall without an air space or brick 

 lining should answer every purpose. 



The Inner Lining. The walls inside should be 

 coated with cement of an excellent quality. If laid 

 on a brick lining it will last for many years where 

 frost does not penetrate the wall. In a stone silo built 

 by W. C. Edwards, M. P., of Rockland, Ont., the 

 cement lining has been in place for ten years and 

 is still in faultless condition. The stone wall is two 

 feet thick. It is faced inside with one tier of bricks 

 laid with the side to the wall, and the cement lining 

 is plastered on the bricks. This fact is in conflict 

 with statements made, which claim that it is neces- 

 sary to apply cement of the consistency of whitewash 

 every two or three years to the inner lining of stone 



