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US Patent: 65,744
Improvement in Scale-Rules
Patentee: William Hay (exact or similar names) - 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 (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This rule features special scales to allow direct reading of the radius, circumference, and area of a circle.

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