US Patent: 1,411,493
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Ellipsograph
Compass for Drawing Ellipses
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Patentee:
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| Johann Hardt (exact or similar names) - Hindenberg, Germany |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 10, 1921 |
| Granted: |
Apr. 04, 1922 |
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Ralph Brendler
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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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