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US Patent: 164,209
Improvement in Adjustable Mechanisms for Dividers, Compasses and Calipers
Patentee:
James H. Potts (exact or similar names) - Penningtonville, PA

USPTO Classifications:
33/558.1, D10/72, D10/89

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Oric Paxson
George H. Martin
Patent Dates:
Applied: Feb. 15, 1875
Granted: Jun. 08, 1875

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
This patent adds a nut to hold the arc in place, allowing the caliper to be completely adjusted with one hand.

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