FOUNDATIONS FOR BLOCK SILOS. 



103 



wire is laid in for reinforcement, the amount of wire used being 

 adjusted to meet the demands of the lateral pressure. The inside 

 of the tile may be plastered or simply washed with a cement 

 wash. 



Fig. 47. — Five types of clay blocks 

 which can be used for silo con- 

 struction. "A" is 5"x8"x24"; "B" 

 is 5"x8"xl6"; "C" is 4"x8"xl6"; 

 "D!" is 5"x5"xl6"; and "E" is 

 4"x5"xl6". (Cuts from Nebraska 

 Bulletin No. 138.) 



Figures 44, 46 and 48 illustrate methods of constructing the 

 foundation and cornice for clay block silos. 



Brick Silos. 



In constructing a brick silo it will be well to guard the fol- 

 lowing points: Make the foundation of concrete and let the 

 first course of brick come flush on the inside with the cement 

 work. Bed a five-eighths inch iron hoop in the cement wall in 

 the upper part before laying the brick, in order to keep the 

 pressure of brick from spreading the wall before it becomes 

 set and hard. Make a two-inch air space in the walls up to 

 within one-third of the top. This will make a 14-inch wall of 

 three courses of brick. The air space should be in the outer 

 part of the wall. Iron tie rods should also be laid around in 

 the wall between the doors, as recommended in the foundation. 

 It is also important that the brick should be wet when laid, 

 otherwise the mortar in which they are laid will be dried out 

 too rapidly. The walls should be plastered over very smoothly 

 with a coat of rich cement, one-fourth to one-half inch thick, 

 and then every two or three years this should be well white- 

 washed with thin cement, to keep the wall protected from the 

 effects of acid in the silos. King recommends that the dobr 



