TENTH ANNUAL YEAR BOOK— PART X 



425 



adjoining buildings had been burned from around it, leaving it unharmed 

 and containing the only feed stuff saved from the fire. Hollow, vitrified 

 clay building blocks ars widely used for fireproofing purposes. 



Fig. No. 5. View ol Doorway, looking toward the roof. Notice the size of 



Openinge. 



APPEAEANCE. 



The Iowa silo presents a pleasing appearance of solidity, durability and 

 permanency. 



SIMPLICITY OF CONSTRrCTION. 



The concrete silo upon investigation has been found to be a satisfactory 

 silo when carefully built. Its construction, however, is so difficult that 

 very few really good silos have been found which have not been constructed 

 by the professional silo builder. The manipulation and construction of the 

 forms for building a concrete silo are so difficult that although a silo may 

 be satisfactorj^ as far as strength and keeping qualities are concerned, the 

 walls are often rough, distorted and not of good appearance. Good forms 

 for the concrete wall are expensive and considerable equipment is neces- 

 sary to handle the concrete. 



The walls of the Iowa silo are of a construction familiar to all masons 

 and for this reason a satisfactory job is practically assured. The rein- 

 forcement of the walls with the steel laid in the mortar joints is a very 

 simple matter. 



