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US Patent: 1,431,654
Compasses For Drawing Oviform Curves
Patentee:
Johann Hardt - Hindenberg, Germany

USPTO Classifications:
33/30.5

Tool Categories:
layout tools : compasses

Assignees:
Johannes Sobawa - Breig, Germany

Manufacturer:
Not known to have been produced

Witnesses:
Freidrich Keil
Margarete Weill

Patent Dates:
Applied: Aug. 05, 1921
Granted: Oct. 10, 1922

Patent Pictures:
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Description:
This is a standard draftsman's compass with an additional attachment to allow it to draw "oviform" (i.e. egg-shaped) curves. It is similar to his earlier patent for drawing ellipses (1,411,493 - 4/4/1922).

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