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US Patent: 35,298
Improvement in Combined Spirit-Levels
Patentee:
Alvin Cahoon, Jr. - Harwich, MA

USPTO Classifications:
24/130, 33/383, 33/451

Tool Categories:
layout tools : levels : inclinometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Samuel L. Cahoon
Alvin Cahoon
Geo. H. Snow
Obed Brooks

Patent Dates:
Granted: May 20, 1862

Patent Pictures:
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Description:
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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