CHAPTER III. 



MONOLITHIC CONCRETE SILOS METAL-LATH 

 AND STEEL-RIB PLASTERED SILOS CEMENT 

 BLOCK AND CEMENT STAVE SILOS VITRIFIED 

 TILE SILOS BRICK SILOS ALL-METAL SILOS. 

 UNDERGROUND SILOS. 



Several types of silos in which cement plays an important 

 part are now in successful use in all parts of the country. Among 

 them are the monolithic reinforced concrete silos, both single 

 wall and double or hollow wall; metal-lath and steel-rib plas- 

 tered silos; cement block and cement stave silos of various 

 types; hollow brick or vitrified tile silos and brick silos. All of 

 these types, as well as the all-metal silos and pit or underground 

 silos will be discussed in this chapter. 



When properly constructed so as to make the walls strong, 

 smooth and impervious, practically all of the types of silos men- 

 tioned above have been used with success. There maybe a dif- 

 ference, of course, from the standpoint of permanence or dura- 

 bility just as there is a difference in the life of various woods 

 used. Aside from the really essential features, there are a num- 

 ber of desirable features attached to the various types outlined 

 herein; and when these are all carefully considered and bal- 

 anced by the prospective silo builder, the cost, fixed largely by 

 local conditions will probably be the deciding factor. 



In the past, the high first cost of all forms of concr-ite con- 

 struction has been the chief influence against their more ex- 

 tensive use, but this has been due to our insufficient knowledge 

 as to the best and most econ<Mnical methods in handling ma- 

 terial. The price of lumber has been steadily rising, while that 

 of good Portland cement has been decreasing, and good qualities 

 can now be obtained at a fair price, so that this factor is largely 

 removed. 



82 



