156 ANNUAL REPORT 
from 1 inch in diameter for the bottom rods to 3% inch in diameter for 
those used at the top. The roof is 2 inches thick. The supporting 
columns are steel railroad rails imbedded in concrete and resting upon 
a foundation of concrete 3 feet thick having wire mesh imbedded in 
the bottom portion. The bottom of the tanks have a conical shape with 
the apex of the cone up and are 4 inches thick. The concrete in the 
foundation was composed of I part cement, 3 sand and 4 parts stone, 
and the concrete for the tank shells was I part cement and 3% parts sand. 
The work was carried on day and night in order to prevent the necessity 
of placing fresh concrete upon set concrete faces. The capacity of the 
tanks is 25,000 barrels of cement. 
Fig. 93.—Water Tower, Revere, Mass. 
Water Tower, Boston Harbor.—At Fort Revere, at the entrance 
to Boston harbor, the first steel concrete water tower built in this country 
has just been completed, although several have been built in Europe during 
the past few years. It consists of a large steel. concrete tower 93 feet 
high with foundations 5 feet deep, enclosing and supporting a steel con- 
crete water tank 50 feet high and 20 feet in diameter. The wall of the 
tank is 3 inches thick at the top and 6 inches thick at the bottom, 
coated inside with one inch of 1 to 1 cement mortar, and on the outside 
with 14 inch of the same. The bottom of the tank is 4 inches thick. 
The wall is reinforced by two systems of vertical 5-16 inch rods spaced 
2 inches apart transversely and 16 inches apart circumferentially, also 
by two sets of horizontal hoops of 4% inch bars spaced 134 inches apart 
vertically at the bottom and gradually increasing the spacing to 334 inches 
toward the top, the upper portion being 3% inch bars space 3 to 334 inches 
apart. 
