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US Patent: 40,428
Improvment in Plumb-Levels
Patentees:
David D. Polleys - La Crosse, WI
William H. Polleys - La Crosse, WI

USPTO Classifications:
33/391

Tool Categories:
layout tools : levels : inclinometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
F. Wilson
D. McMillan

Patent Dates:
Granted: Oct. 27, 1863

Patent Pictures:
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Description:
This is a really interesting design for an inclinometer. It uses a fully enclosed wheel, with the hub of the wheel being graduated in degrees and weighted at 180 degrees. The level stock has a small window with a hairline in it to allow it to read the graduations on the wheel.

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