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US Patent: 211,096
Improvement in grindstone-frames
Patentee:
Joseph E. Hoppen - Newark, NJ

USPTO Classifications:
451/361

Tool Categories:
metalworking machines : grinders

Assignees:
None

Manufacturer:
J. E. Hoppen - New York, NY

Witnesses:
J. F. Hoppen
W. F. Hattersley

Patent Dates:
Applied: Jul. 02, 1877
Granted: Jan. 07, 1879

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for J. E. Hoppen
Description:
The innovations are an adjustable water-trough that can be raised or lowered to fit the diameter of the stone, and a foot pedal that can be positioned on either side of the frame.

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