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US Patent: 57,934
Improved Gage for Screw-Cutting Tools
Screw Gage
Patentee:
Edward Lyman - New Haven, CT

USPTO Classifications:
33/629

Tool Categories:
layout tools : special purpose gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
M. A. Heine
John H. Shumway
John E. Earle

Patent Dates:
Granted: Sep. 11, 1866

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
This is a simple tool to help a machinist accurately set the lathe bit for various screw cutting configurations.

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