THE "WISCONSIN" SILO. 



41 



The great danger with this type of hning will be that the 

 boards may not press the two layers of paper together close 

 enough but that some air may arise between the two sheets 

 where they overlap, and thus gain access to the silage. It would 

 be an excellent precaution to take to tack down closely with 

 small carpet tacks the edges of the paper where they overlap, and 

 if this is done a lap of 4 inches will be sufficient. 



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 dry 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. 



Fig. 8.— Showing construction of conical roof of round silo, where 

 rafters are not used. The outer circle is the lower edge of the 

 roof, the second is the plate, the third and fourth circles are 

 hoops to which the roof boards are nailed. The view is a plan 

 looking up from the under side. 



