44 Concrete Silos 



tion. But one side of the silo was blown in, thus ren- 

 dering it praetic'ally worthless until it had been 

 repaired. 



During the summer of 1911 thirty-one stave silos 

 erected in the vicinity of Lincoln, Neb., were inspected. 

 In the inspection no silo was passed by. They were 

 taken singly one by one as they were found. Here is 

 the result of the inspection: 



Five had blown clear down once before they had 

 been built twelve months; one blew clear down twice 

 before it had been built twelve months ; one blew clear 

 down three times before it had been built twelve 

 months; one blew clear down once before it had been 

 built five years; one blew clear down once before it 

 had been built nine years; two blew clear down, but 

 the date of their erection was not ascertained; eight 

 had been re-erected 

 once before they 

 were up twelve 

 months ; one had been 

 re-erected twice be- 

 fore it was up twelve 

 months ; four were 

 leaning badly ; one 

 had been straighten- 

 ed twice; two had 



7 Wood Stave Silo After a Fire 



very loose hoops ; one 



had broken nearly every hoop more than once; only 



six were in good condition. 



With such a record as this, it is impossible to classify 

 wood stave silos as permanent structures, and 

 this impossibility rests not, as the wood stave silo 

 men claim, upon failure to observe mechanical prin- 

 ciples in the erection of them , but upon qualities 



