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US Patent: 449,609
Spirit-Level
Patentee:
Henry Green - Hartford, CT

USPTO Classifications:
33/371

Tool Categories:
layout tools : levels

Assignees:
John J. Tower - New York, NY

Manufacturer:
Unknown

Witnesses:
H. R. Williams
Arthur B. Jenkins
John P. Healy

Patent Dates:
Applied: Aug. 05, 1890
Granted: Mar. 31, 1891

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
This is a small level designed to be attached to a ruler or drill bit. It features a built-in protractor to allow it to be used to measure specific angles.

Known examples are marked only with the patent date, but since the patent was assigned to John Tower, I assume that this piece was produced by Tower & Lyon.

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