236 ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 



TABLE NO. I. — Showing Size and Capacity of Silo for Herds of 

 Various Sizes. 



Feed for 180 days 



No. of Cows 



Diameter 



Height 



Capacity — Tons 



7-10 



10 feet 



25 feet 



36 



10-12 



10 feet 



28 feet 



42 



12-15 



11 feet 



29 feet 



60 



15-20 



12 feet 



32 feet 



73 



20-25 



13 feet 



33 feet 



83 



25-30 



14 feet 



34 feet 



115 



30-35 



15 feet 



34 feet 



131 



35-40 



16 feet 



35 feet 



158 



40-45 



20 feet 



35 feet 



258 



Making the Forms. 



After having decided upon the size of silo needed the next 

 thing is to secure forms for the construction of the walls. If 

 the forms of correct size can be hired in the neighborhood or 

 from a distance it will be advisable to secure them rather than 

 to go to the trouble of making them. If not, the cost of making 

 is not excessive. They are fairly simple and can always be 

 hired out or sold for enough to repay the cost of construction. 



The forms can be most easily made in six sections each. 

 To mark out patterns observe the following: Clean off a large 

 space on a barn floor, then select a long piece of straight strip- 

 ping at least 20 feet in length. Nail to the floor at any conven- 

 ient place and from the center of the nail measure out on the 

 strip the exact distance of the radius of the silo to be built. 

 Drive a nail through the stripping here so that the point will 

 scratch. If the wall is to be six inches thick measure from the 

 center of this nail six inches farther and drive another nail so 



