THE SILO. 



411 



pole to guide by and brace to. The bottom wall was made thick and 

 tamped against the earth bank. When the level of the ground was 

 reached he carefully leveled up the work and started the outside form, 

 which was made of a band of iron, 20 inches wide and 53.43 feet long, 

 rolled to form the circle and was fastened with clamps at the ends. The 

 silo being 16 feet in diameter and the walls 6 inches thick, the form is 

 then 17 feet in diameter. This was leveled and the space between 

 it and the inner wall of boards filled with concrete and tamped. When 

 this hardened the form was loosened, raised and screwed tight again 

 after getting it level ; the space again filled and so on to the top. The 

 inner wall was raised as needed, being braced against the center pole 

 from all sides. 



See figure 7. Notice at the top of the silo the iron form still stands 

 surrounding the wall it last built. 



¥ 



"/CO*/!0'J C'*"?rA/'/S-V" 



figure 7. Concrete silo of Mr. C. J. W. Jones, Roanoke, Mo. Made by Mr. Jones and 



his son. 



(Courtesy Hoard's Dairyman.) 



Every few feet a wire rope made of four strands of No. 9 wire, 

 twisted, was built into the wall to prevent cracking. Iron rods, bent to 



