THE "WISCONSIN" SILO. 73 



The first layer of lining should be put on with 8-penny 

 nails, two in each board and stud, and the second or inner 

 layer with 10-penny nails, the fundamental object being to 

 draw the two layers of boards as closely together as 

 possible. 



Such a lining as this will be very durable because 

 the paper will keep all the lumber djy except the inner 

 layer of half-inch boards, and this will be kept wet by 

 the paper and silage until empty, and then the small 

 thickness of wood will dry too quickly to permit rotting 

 to set in. 



A still more substantial lining of the same type may 

 be secured by using two layers of paper between three 

 layers of boards, as represented in Fig. 4, and if the cli- 

 mate is not extremely severe, or if the silo is only to be 

 fed from in the summer, it would be better to do away 

 with the layer of sheeting and paper outside, putting on 

 the inside, thus securing two layers of paper and three 

 layers of boards for the lining with the equivalent of only 

 2 inches of lumber. 



The Silo Roof. 



The roof of cylindrical silos may be made in several 

 ways, but the simplest type of construction and the one 

 requiring the least amount of material is that represented 

 in Figs. 7 and 8, and which is the cone. 



If the silo is not larger than 15 feet inside diameter 

 no rafters need be used, and only a single circle like that 

 in the center of Fig. 8, this is made of 2-inch stuff cut in 

 sections in the form of a circle and two layers spiked 

 together, breaking joints. 



The roof boards are put on by nailing them to the 

 inner circle and to the plate, as shown in the drawing, 

 the boards having been sawed diagonally as represented 

 at H, Fig. 2, making the wide and narrow ends the same 

 relative widths as the circumferences of the outer edge 

 of the roof and of the inner circle. 



