UNIVERSAL PORTLAND CEMENT CO. 
97 
Concrete Block Systems 
The Elgin silo, built by The Elgin Silo Co., Elgin, Illinois, is a con- 
crete slab type, as illustrated at the right on this page. This company 
manufactures and delivers the slabs to the contractor or farmer. 
^9in Silo 'pjjg method of construction appears to be an improvement 
over some unit methods and the protection of the steel rein- 
forcing bands by concrete is undoubtedly an improvement. 
The Hurst Silo Co., at 416 McCormick Building, Chicago, manufac- 
tures concrete blocks for reinforced concrete silo or tank construction. 
The Hurst silo blocks have been successfully used in a large 
Si'hCo number of silos, and the Hurst silo block molds are manufac- 
tured and sold by them. These molds are furnished in sets 
of ten each. There are no screws or bolts used in the Hurst molds, 
which are 23}^ inches long, 11% inches high, and 4 inches thick, contain- 
ing approximately 2/3 of a cubic foot. At the left of pages 97 and 98 
are shown Hurst silos. 
One of the features in the Hurst silo block is the method of reinforc- 
ing, which is simple and effective. It is sometimes lost sight of in building 
block silos that reinforcement is just as necessary in this type as in any 
other type. The Hurst Co. provides a roof frame on which a reinforced 
concrete roof can be constructed. 
Hurst Reinforced Concrete Block Silo, built on Cement Slab Silo on D. B. Hoornbeck's farm, 
J. W. Cooper's farm at Whitewater, Wisconsin, Elgin, Illinois; built by Elgin Cement Silo Co. 
bv Chas. B. Hurst Co., Chicago. Fire destroyed other buildings. 
