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History of Westchester County, New York — Passage 347 (part 2)

J. Thomas Scharf (1886) 110 words View original →

[J. Thomas Scharf (1886)] The most prominent of the valleys are Lounsberry's, Indian Brook, Sing Sing Kill, Mill River, Jewell's Brook and Saw-Mill River; the foundations of which are in no case less than forty feet below the grade-line, or fifty-three feet below the top covering of the aqueduct. Besides those above five and a half inches. The bottom is an inverted arch; the side walls rise four feet above the spring-line, with a bevel of one inch to a foot rise, so that the width at the top is eight inches greater than at the bottom; and the roofing arch is a semi-circle. In ex-cavations a bed of concrete masonry is made the

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