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US Patent: 181,411
Improvement in Frame-Squaring Tools
Jerome Cleveland - Tecumseh, MI

USPTO Classifications:

Tool Categories:
rules : measuring rods
layout tools : compasses : trammels

Otis W. Bean - Tecumseh, MI

Not known to have been produced

Albert D. Lawrence
Charles Burridge
John Goethals

Patent Dates:
Applied: Jun. 26, 1876
Granted: Aug. 22, 1876

Patent Pictures:
USPTO pdf tiff
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This tool is designed to check a rectangular from for square-ness by measuring each diagonal. It features two adjustable points on a long rod, which can register two opposite corners of the frame. When both diagonals are the same length, the frame is square.

This tool also has points to allow it to be used as a trammel, but no claims are made in the patent for this feature.

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