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US Patent: 297,602
Thomas Hooker - Syracuse, NY

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers


Not known to have been produced

William E. Fitch
C. W. Smith

Patent Dates:
Applied: Mar. 21, 1883
Granted: Apr. 29, 1884

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The object of my invention is to provide a micrometer, which will both indicate and accurately measure slight differences of size between articles or portions of the same article upon comparing them one with another or with a standard gage. It consists, first, of a body inclosing a sliding bar and carrying an index needle actuated by the sliding bar, with a graduated scale upon the end of the body and an adjusting screw opposite to the sliding bar, the screw and bar forming the jaws; second, of a multiplying index needle actuated directly by the sliding bar without the aid or intervention of lever bars; third, of a micrometer provided with a scale graduated both ways from a central zero-point at the extremity of the index needle; fourth, of an index-needle and sliding bar operating together and both controlled by a spring acting directly upon the index-needle and through it upon the sliding bar in the head of the micrometer; fifth, of the several combinations of parts hereinafter specified.

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