BUILDING THE SILO. 315 



be necessary in very cold climates to have two thick- 

 nesses of boards for the outer lining, with tarred 

 paper between, as shown in Fig. 36. But usually a 

 covering of drop siding, such as is ordinarily used, 

 will suffice. In mild climates an outer covering may 

 not be necessary, except for the purpose of hiding 

 the uncouth appearance of an uncovered frame. 



Partitions. When partitions are used in a silo 

 with a width of not more than sixteen feet, they may 

 ordinarily consist of planks two inches thick and 

 held in place at either end by a groove formed along 

 the wall to receive them. (See Page 286.) When 

 filling a silo with a partition of such material, it will 

 be necessary to fill on both sides of the partition or 

 to brace one side while the other is being filled. In 

 a silo twenty-four feet in hight, three iron rods of 

 about three-fourths inch iron should run through 

 the partition at suitable distances from one another 

 and in grooves made for them between the planks. 

 ( See Page 287. ) The rods should be threaded at the 

 ends and should have under the burrs washers of 

 metal of sufficient size to prevent the burrs from 

 drawing into the wood. When thus protected, the 

 walls of the rectangular silo cannot spread. 



The Corners. In each inside corner a scantling 

 should be placed on end and spiked to the walls so 

 as to present a beveled edge on the inside. A scant- 

 ling 2x4 inches or 4x6 inches ripped diagonally 

 through the center, that is to say, from two opposite 

 corners, will furnish the requisite material for cor- 

 ners. The beveled edge should of course be planed. 



The Doors. The doors, as in the stave silo, 

 should be placed one above another. (See Page 305.) 



