STATE GEOLOGIST. 181 
that confidence may be strengthened in the value of concrete for struc- 
tures placed under trying conditions. 
The Ithaca Water Works Company wished to increase and de- 
velop their source of supply for the city of Ithaca but felt that they 
could not put in sufficient capital to build a large dam with a gravity 
section. Several plans and estimates were made but all were too 
high in price. 
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lertcaldection on CenterLine. 
Fig. 119a.—Cross Section of the Ithaca Dam. 
Mr. Gardner S. Williams, Associate Professor of Civil Engineer- 
ing at Cornell University, was engaged as consulting engineer to 
prepare plans and he designed the dam illustrated in figures 119 
and I19a, accomplishing a reasonably large storage for a minimum 
construction. The dam was originally designed to be go feet high 
but was reduced to its present height in building. It is built in a 
narrow slate or shale gorge about go feet wide at the point where the 
