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US Patent: 1,411,493
Ellipsograph
Compass for Drawing Ellipses
Patentee:
Johann Hardt - Hindenberg, Germany

USPTO Classifications:
33/30.5

Tool Categories:
layout tools : compasses

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. Wirth
Frederick Vietteger

Patent Dates:
Applied: Mar. 10, 1921
Granted: Apr. 04, 1922

Patent Pictures:
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Description:
This is a simple compass with the addition of an adjustable loop of string to allow it to be used for drawing ellipses. The length of the loop is controlled by a small screw on one arm of the compass.

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