Clarke, Cornelius D.
New York City Department of Records & Information Services
NYC Dept. of Records and Information Services
31 Chambers St., Room 101
New York, N.Y. 10007
2 items (11 pages).
Frederick Graff, born on August 27, 1774, and died on April 13, 1847, was the Chief Engineer of the Philadelphia Water Department. The New York Water Works inventions make up items #288 and #289. Item #288 is a March 7, 1816 sworn statement certifying that Cornelius D. Clarke invented "a machine for the purpose of raising water by means of under-shot wheel and pumps" in January 1816. Item #289 consists of 3 letters, all from Frederick Graff to William Kimble, New York Agent for the "West Point Foundry Association". The first letter, dated February 19, 1830, commented on Kimble's plans for a water pump. The next two letters, dated february 20 and February 24, 1830 contain elaborations of Graff's comments made in his earlier letter. All of the letters are illustrated with Graff's concept of an efficient water pump for New York City's waters.