US Patent: 217,015
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Mariner's Compass
Add-on corrective magnets
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Patentee:
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| Stephen Longfellow (exact or similar names) - St. Louis, MO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 16, 1877 |
| Granted: |
Jul. 01, 1879 |
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Patent Pictures:
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Condensed view of all drawings |
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George Langford
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Description: |
| Magnets can be added around rim of the compass to correct for the effects of residual magnetism in the ship's structure and cargo. |
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