US Patent: 1,431,654
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| Compasses For Drawing Oviform Curves
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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: |
Aug. 05, 1921 |
| Granted: |
Oct. 10, 1922 |
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Ralph Brendler
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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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