CONCRETE SILOS 
The Perfect Silo, built by the Perfect Reinforced Silo & Cistern 
Block Co., of Delaware, Ohio, has met with great favor amongst Ohio 
The Perfect ^ \a.vg,e number have been put up in Delaware and 
Silo adjacent counties. Some of these silos have been built by the 
owners with block purchased from the above company. 
This system differs from all others in the dimensions of the blocks and 
the method of reinforcing. The blocks are 24 inches long, 12 inches high, 
and 4 inches thick. Each block is reinforced with two iron bands running 
lengthwise 6 inches apart. Each rod is looped and turned 6 inches from 
each end. These loops are spaced so as to correspond with 3-^-inch round 
vertical holes which are formed in the block. AVhen the blocks are laid 
in the wall these vertical openings are filled with cement grout and steel 
dowel pins are passed through this soft material and inserted about half 
way in the block below. The rods should be of such length that they 
will reach up about half way in the blocks above. The blocks have a 
groove 3^ inch deep in the top edge which provides space for a larger 
mortar bed and also for the heavy horizontal rods which span the contin- 
uous door openings at intervals of 2 feet. These rods are firmly fastened 
to the vertical dowel pins. The dowels next to the door openings are made 
of heavy pipe in 4-foot sections firmly screwed together. 
This system is shown on page 99. 
Hurst Silos built on famous Crab Tree Farm, Concrete Block Silo of John Hubing, at Loyal, 
Lake Bluff, Illinois. Built after fire had de- Wisconsin. Fire completely destroyed barn; silo 
stroyed everything but concrete milk house. and contents uninjured. 
