158 | ANNUAL REPORT 
The concrete was mixed in the following proportions: For the foun- 
dation I part cement, 3 parts sand and 6 stone. For the tower 1 part 
cement, 2 parts sand and 5 stone. For the water tank 1 part cement, 2 
parts sand and 4 stone. 
Figures 91 and 92 show the plans and a photograph of the Illinois - 
Steel Company’s cement bins. Figures 93 and 94 show the plans and a 
photograph of the Revere water tower. Figures 95 and 96 illustrate the 
use of concrete for water tanks and silos. 
Fig. 95.—Water Tank for Stock at Clarke Lake, Michigan. 
BRIDGES AND CULVERTS. 
The First Concrete Bridge.—The first concrete bridge constructed 
in the United States was built over Pennypack Creek on Pine Road, 
Philadelphia. It was designed by Mr. C. A. Frik, superintendent of 
bridges in Philadelphia, and was built in 1893.* 
The bridge consists of two spans each 25 feet 434 inches long, with 
a rise of 6 feet 6inches. It is 34 feet wide and carries a 26 foot macadam 
road. The arches are 2 feet, 3 inches deep at the crown. The spandrel 
walls and the faces of the arches are molded to represent Ashlar masonry, 
and then pebble dashed for a surface finish. Imported Portland cement 
*Hngineering News, Sept. 7, 1898. 
