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US Patent: 51,767
Improvement in Calipers
Combination Calipers and Trammels
Patentee:
Seth Whelan - Burnt Hills, NY

USPTO Classifications:
33/332, 33/342

Tool Categories:
layout tools : calipers
layout tools : marking gauges
layout tools : compasses : trammels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. Whelan
Frank Whelan

Patent Dates:
Granted: Dec. 26, 1865

Patent Pictures:
USPTO pdf tiff
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Description:
This is an interesting design for machinist calipers/dividers in the form of a trammel. It also includes a marking point on the rule, allowing it to be used as a simple scratch gage.

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