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US Patent: 41,396
Improvement in in Trying-Squares
Patentee:
John Richards - Columbus, OH

USPTO Classifications:
33/471

Tool Categories:
layout tools : squares : try squares

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. Shafer
R. T. Campbell
W. C. Hard
W. H. Doane

Patent Dates:
Granted: Jan. 26, 1864

Patent Pictures:
USPTO pdf tiff
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Description:
This is a very unusual design for a square. Instead of the blade being fixed at a perfect right angle, it pivots a few degrees in each direction. It is intended to allow a woodworker to gauge the squareness of an edge by feel, without having to look to see if light shows under the blade.

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