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US Patent: 45,894
Improvement in Calipers
Patentee:
F. O. Washburn - Millville, MA

USPTO Classifications:
33/801

Tool Categories:
layout tools : calipers

Assignees:
John C. Scott - Millville, MA
F. O. Washburn - Millville, MA

Manufacturer:
Not known to have been produced

Witnesses:
G. W. Reed
J. W. Coombs
O. A. Fairbank
T. T. Smith

Patent Dates:
Granted: Jan. 10, 1865

Patent Pictures:
USPTO pdf tiff
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Description:
This is a caliper with a build in scale, and the ability to set both an inside and outside dimension at once. The inventor claims this to be useful for turning shafts to fit a hole.

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