

Vol. 31 



SEPTEMBER, 1915 



No. 3 



How New York Will Measure 500, 000, 000 

 Gallons of Water a Day 



By Charles W. Person 



y^ALILEO said in 1700 that he could 

 \J learn more of the movements of 

 Jupiter's satellites than he could of the 

 flow of a stream of water. Ninety-seven 

 years later, however, an Italian 

 philosopher, J. B. Venturi 

 discovered a principle 

 which enables the en- 

 gineers of this cen- 

 tury to measure A 

 accurately a n c 

 quickly any 

 given quantity 

 of water from 

 a drop up to a 

 billion gallons 

 and more. It 

 is this old Ital- 

 i a n ' s principle 

 which makes pos- 

 sible the method 



In the Circle: Bronze 

 Casting for Throat of 

 Meter. At the Left: 

 One of the Meter 

 Throats. At the Right: 

 Section in Aqueduct 

 Line Reserved for Meter. 



and apparatus for measuring the flow of 

 water through the Catskill Aqueduct. 



The completion of the Catskill Aque- 

 duct will provide means of delivering to 

 New York City a daily water 

 supply of at least 500,000,- 

 ooo gallons, through its 

 loo - mile chain of 

 dams, aqueducts, 

 k pressure tunnels 

 and steel pipe si- 

 phons. A com- 

 prehensive plan 

 for determin- 

 ing how much 

 water the 

 Aqueduct will 

 deliver has been 

 developed, and 

 three meters will 

 be placed at three 



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