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US Patent: 71,979
Improvement in Sawyers' Rules
Patentee:
Thomas Carter - Louisville, KY

USPTO Classifications:
235/70C, 235/70R, 33/494

Tool Categories:
rules : rule graduations
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Lloyd Harris
J. G. Downing

Patent Dates:
Granted: Dec. 10, 1867

Patent Pictures:
USPTO pdf tiff
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Description:
Special graduations which allows calculation of thickness of planks, diameter of the log, or the number of planks that can be cut to be directly read if the two of the three measurements are known. Also an additional scale is provided that indicates the number of turns required on the log carriage for cutting boards of a particular thickness.

Mr. Carter also states that the most convenient size of the rule is thirty inches by three (30"x3")

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