US Patent: 51,767 - Combination Calipers and Trammels


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US Patent: 51,767

Improvement in Calipers
Combination Calipers and Trammels

Patentee:

Seth Whelan (exact or similar names) - 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:

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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.