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US Patent: 580,432
Speed Indicator
Patentee:
Laroy S. Starrett - Athol, MA

USPTO Classifications:
235/103

Tool Categories:
specialty tools : wheel-based measurers

Assignees:
None

Manufacturer:
L. S. Starrett Co. - Athol, MA

Witnesses:
Charles G. Keyes
A. H. Spencer
Matthew M. Blunt
Samuel P. Thrasher

Patent Dates:
Applied: May 20, 1895
Granted: Apr. 13, 1897

Patent Pictures: [ 1 | 2 ]
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Description:
A machinist's speed indicator, which is pressed against a rotating shaft to count rotations in a specific time period to calculate RPM.

This tool was produced in large numbers by the Starrett company, but a later improvement to this patent (786,073 - 3/28/1905) was even more popular.

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