154 ANNUAL REPORT 
these all have similar form and require the same character of construction, 
space will only be taken to describe a couple of forms. 
Illinois Steel Company’s Cement Bins.—In 1902, the Illinois Steel 
Company erected four steel concrete cement storage bins at South 
Chicago. They are 25 feet in diameter and 5314 feet high, set upon the 
four corners of a square. They are mounted upon columns, 15 feet above 
the ground and the tanks being connected together, the space between 
them is also used for storage purposes. The walls of the tanks are 7 
inches thick at the bottom and 5 inches thick at the top. The reinforcing 
Fig. 91.—Concrete Bins for Storing Cement, 
Illinois Steel Company, South Chicago, Ill. 
metal used was a 1 by 4 inch No. 9 wire mesh attached to and stiffened by 
circumferential rods spaced 4 inches apart vertically and varying in size 
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