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US Patent: 26,716
Calipers
Patentee:
Charles D. Sutton - Kensico, NY

USPTO Classifications:
33/797

Tool Categories:
layout tools : calipers
trade specific : wheelwright

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Oscar B. Sutton
E. Chichester Fisher

Patent Dates:
Granted: Jan. 03, 1860

Patent Pictures: [ 1 | 2 ]
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Description:
This is a set of calipers designed to easily determine the circumference of the piece being measured. One the measurement is taken, a graduated scale can be slid into place that allows the circumference to be read directly.

This tool is particularly mentioned to be useful for wheelwrights, so I assume it is fairly large. Featured in the March 17, 1860 issue of Scientific American magazine.

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