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US Patent: 65,744
Improvement in Scale-Rules
Patentee:
William Hay - Dumbarton, Scotland

USPTO Classifications:
33/471

Tool Categories:
rules : rule graduations

Assignees:
Robert Hay - Mineral Point, WI

Manufacturer:
Not known to have been produced

Witnesses:
John Dickson
John Haythorn
J. W. Coombs
G. H. Reed

Patent Dates:
Granted: Jun. 11, 1867

Patent Pictures:
USPTO pdf tiff
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Description:
This rule features special scales to allow direct reading of the radius, circumference, and area of a circle.

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