US Patent: 1,885,972 - Hardness testing gauge


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US Patent: 1,885,972

Hardness testing gauge

Patentee:

Charles H. Wilson (exact or similar names) - Pelham, NY

USPTO Classifications:

73/83

Tool Categories:

metalworking tools : machinist tools : measuring tools : metal hardness testers

Assignees:

Wilson Mechanical Instrument Co., Inc. - New York, NY

Manufacturer:

Wilson Mechanical Instrument Co., Inc. - New York, NY

Wilson Mechanical Instrument Division, American Chain & Cable Co., Inc. - Bridgeport, CT

Witnesses:

Unknown

Patent Dates:
Applied:	Apr. 16, 1930
Granted:	Nov. 01, 1932

Patent Pictures:

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"Vintage Machinery" entry for Wilson Mechanical Instrument Co.

Description:

Improvements to the Rockwell hardness tester, patents 1,516,207 and 1,516,208, intended to reduce friction as a confounding factor that led to inaccurate measurements.