MATERIAL FOR THE SILO. 89 



Note. Before filling silo, tar paper should be tacked 

 tightly over doors and the entire inside of silo examined 

 and cracks tightly caulked. 



The method of construction specified in the preceding 

 may of course be modified in many particulars, according 

 to the conditions present in each case, cost of different 

 kinds of lumber, maximum amount of money to be ex- 

 pended on silo, etc. 



The following directions for the construction of stave 

 silos are taken from two bulletins on this subject, published 

 by the Cornell and Ottawa Experiment Stations. For a 

 silo 20 feet in diameter, a circular trench 18 inches to two 

 feet wide and with an outer diameter of 22 feet is dug 

 about 2 feet deep, or below the frost line. The surface 

 soil over the whole included area, and for 2 feet outside, is 

 removed to a depth of 10 or 12 inches at the same time. 

 The trench is then filled to the level of the interior with 

 stone, well pounded down, the surface stone being broken 

 quite small, and thin cement (1 part of cement to 4 of sand 

 thoroughly mixed) poured over, well worked in and left 

 for a few days. This is followed by a coat of good cement 

 (1 part cement to 3 sand), care being taken when finished 

 to have the surface level and smooth. 



The silo is set up as shown in Fig. 15, which shows 

 a cross-section of one method of construction. 



The posts (a, a, a, a) should be of 6x6 material and 

 rim the entire length of the silo. These should be first 

 set up vertically and stayed securely in place. 



The scaffolding may be constructed by setting up 2 by 

 4 scantling in the positions shown in Fig. 15, as b, b, b, b. 

 Boards nailed from these 2 by 4 scantling and to the 

 6 by 6 posts will form a rigid framework, across which 

 the planks for the scaffold platform may be laid. Be- 

 fore the scaffolding is all in place the staves should be 

 stood up within the inclosure; otherwise difficulty will be 

 experienced in getting them into position. 



It is probable that no better material can be obtained 

 for the staves than Southern cypress. This, however, is 



