Concrete Silos 



81 



Completing- a Monsco Silo. 



The construction is carried on by means of a center 

 mast of steel, this mast carrying a steel frame for 

 staging and also a revolving derrick carrying the 

 buckets, by means of which the concrete is elevated 

 and deposited. The elevation on the mast of both the 

 staging and derrick are under control of the men on 

 the staging, so that they can be readily moved up as 

 the construction proceeds. The mast and staging 



