US Patent: 35,298
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| Improvement in Combined Spirit-Levels
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Patentee:
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| Alvin Cahoon, Jr. (exact or similar names) - Harwich, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
May 20, 1862 |
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Ralph Brendler
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Description: |
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This is really interesting level patent.
The author names this tool a "ploiometer", and is used to assist a
in the loading of cargo into a ship by determining the fore and
aft level to ensure that the balance of the ship is correct. According to the
inventor, the boat should be slightly heavier towards the back to
counteract the forward thrust of the sails.
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