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US Patent: 1,402,629
Circle Rule
Patentee:
Ernest P. Manly - Portsmouth, VA

USPTO Classifications:
33/27.03

Tool Categories:
layout tools : compasses
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 29, 1921
Granted: Jan. 03, 1922

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
This ruler features a slot down its center, with a sliding member that rides in the slot and holds a pencil, allowing it to be used as a compass.

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