FACTS RELATING TO SILO CONSTRUCTION. 277 



by the hight in feet, then multiply the product by 

 .7854 which gives the cubic contents. For example, 

 suppose it is required to find the contents in cubic 

 feet of a round silo fifteen feet in diameter and 

 twenty feet high, the square of fifteen, the diameter, 

 equals 225, which multiplied by the hight, twenty 

 feet, gives 4,500. This multiplied by .7854 gives 

 3534.3 cubic feet. But one-fourth must be allowed 

 for waste space and v\?aste silage, which leaves 

 2650.725 cubic feet as the capacity of the silo for 

 good silage. This silage will average about forty 

 pounds to the cubic foot which will give 106,029 

 pounds or 53 tons. 



While it may be easily possible to adjust the 

 size of the silo to the present or prospective needs 

 of the stock, it is sometimes wiser to build two or 

 more silos rather than to try to put all the silage 

 into one. In feeding silage, about two inches in depth 

 of the exposed surface should be removed daily to 

 prevent waste from unduly prolonged exposure, and 

 when feeding silage in warm weather, about three 

 inches of the same should be removed daily. In a 

 large silo such a depth of surface would probably be 

 in excess of the needs of the stock. In such an 

 instance, therefore, it would be better to erect two 

 small silos, if built on the plan of the round structure, 

 than to build one large silo of equal capacity. Bul" 

 in rectangular silos the difficulty mentioned may be 

 obviated by putting in one or more partitions. 



Materials Used in Silos. — Silos differ first, 

 in the materials used in their construction, and 

 second in the form given to them. The materials 

 that have been used in building silos include wood. 



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