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US Patent: 1,427,493
Arc-Describing Instrument
Patentee:
Forrest H. Murray - Cambridge, MA

USPTO Classifications:
33/27.01

Tool Categories:
layout tools : compasses

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 03, 1920
Granted: Aug. 29, 1922

Patent Pictures:
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Description:
This design covers a new kind of draftsman's compass, which the inventor claims allows arcs of any diameter up to infinity to be accurately drawn.

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