10 



has thoroughly set it will give additional strength. A little dry cement 

 sprinkled upon the surface before pouring is also a great aid in obtaining 

 a good connection. 



MATERIAL FOB ONE CUBIC YABD OF CONCBETE. 



COST PEB FOOT IN HEIGHT OF SILOS. 



Mixture, one part cement, two and one-half parts sand, five parts gravel. 

 Wall, 6 inches thick. 



To determine the amount of material necessary for any silo, multiply the 

 figures given after the diameter by the desired height, thus : 

 A silo 14 feet in diameter and 30 feet high requires 

 Cement 0.903x30=27.09 barrels. 

 Sand 0.372x30=11.16 cubic yards. 

 Gravel 0.74 X 30=22.2 



Then multiply the amount of material by the prices. The above figures 

 make allowance for neither foundation nor floor, but the previous table will 

 assist in determining the cost of these. 



FOUNDATION. 



The foundation should be such that no possibility of settling occurs. 

 A firm sandy loam is the best soil on which to build, and then a clay. Mucky 

 swamp soils are to be avoided ; but if they have to be utilized, extra precau- 

 tions should be taken. 



These directions for the laying-out of a foundation will apply to any kind 

 of silo, though, in the case of a stave silo, a foundation wall of solid concrete 

 is not as necessary owing to its having to support less weight. A foundation 

 of broken stone should, however, have a cement surface, and the inside should 

 also be lined with cement if the silage is. to come into contact with it. 



On the selected site, lay out a circle of a size at least 12 inches greater 

 than the required inside diameter. Drive in a stake with a large nail on the 

 top. Prepare a sweep with a hole in one end to fit over the nail, and a sharp 

 l>ointed stick 6 inches farther from the nail than half the diameter of the silo. 

 Ken-ping the sweep true by means of a level, draw a circle. Excavate within 



