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US Patent: 149,761
Improvement in Trammels or Beam-Compasses
Patentee:
Chancy H. Lathrop - Jersey City, NJ

USPTO Classifications:
33/27.03

Tool Categories:
layout tools : compasses : trammels

Assignees:
Robeson Paton - Wortendyke, NJ

Manufacturer:
Unknown

Witnesses:
Michael Ryan
Fred Haynes

Patent Dates:
Applied: Feb. 07, 1874
Granted: Apr. 14, 1874

Patent Pictures: [ 1 | 2 ]
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Description:
This design for a trammel set features a cam-based locking mechanism that both locks the pencil or point in the head, as well as the head to the bar.

Known examples mark "Pat Appl'd For" on the locking levers.

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