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US Patent: 82,917
Centering Square
George W. Brooks - Clinton, MA

USPTO Classifications:

Tool Categories:
layout tools : squares : center squares


Not known to have been produced

Ira Greenough
Artemus W. Goddard

Patent Dates:
Granted: Oct. 13, 1868

Patent Pictures:
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The nature of my invention consists in applying to an angle of ninety degrees, made of iron or any other suitable material, of the proper form, a movable tongue, of an L-form, which shall be attached to the angle by a bolt and thumb-nut, in such a way that it will divide the angle exactly in the centre, thus making a tool, which can be used for making a longitudinal line on shafting or anything of a like form, or for centring shafting or circular disks, and also as an inside or an outside square.

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