Cement for the Farm. 



427 



Silo — Excavate (Fig. 18) for the whole base and foundation well 

 below the frost line. The foundation walls should rest upon a firm 

 soil. Build to above the surface of the ground a circular foundation 

 wall in this excavation from 16 to 20 inches thick, depending upon 

 the size of the proposed silo. When this wall has seasoned and the 

 forms are removed, fill several inches of the excavation within this 



v.-,* .'«•■■/• r-^^-j" 



y^'^^T^'^ 



Figure 18. Silo foundation and section of walls. Hollow wall construction. 



foundation wall or space with cinders, gravel or broken stone, tamping 

 them well as they are placed. After roughening the six or eight 

 inches of the foundation walls above the filled space and wetting the 

 filled-in material, finish flooring the space with a rich concrete. This 

 is the foundation and floor for the silo. Be sure it is well drained. 



Erect the walls of (Figs. 8, 9 and 18, circular forms) hollow re- 

 inforced concrete three or four inches thick with a six or eight-inch 

 air chamber. They must be well reinforced, vertically and horizon- 

 tally, with one-half inch steel rods vertically about three feet apart near 

 the outside of each wall, lapping well at loose ends and well into each 

 form section, and by one-half inch steel hoops horizontally in each 

 wall running entirely around the wall and spaced one foot. Use 

 either this or its equivalent in reinforcing. 



Erect these walls in sections of four to six feet, allowing the first 

 to get well set before removing the forms to place on the next section. 

 The forms should overlap the section already built by three or four 

 inches to insure a good and plumb connection. The top of each 

 finished section should be cleaned, roughened and wetted before de- 

 positing the concrete of the following one. 



