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US Patent: 191,389
Improvement in Spirit Levels
Patentees:
Frederick T. Ward - Mohawk, NY
Thomas Bedworth - Mohawk, NY

USPTO Classifications:
33/350, 33/384

Tool Categories:
layout tools : levels : metallic levels

Assignees:
None

Manufacturer:
Ward & Bedford - Ilion, NY

Witnesses:
William Helmes
Fergus Truman

Patent Dates:
Applied: Apr. 21, 1877
Granted: May 29, 1877

Patent Pictures: [ 1 | 2 | 3 ]
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Description:
Primary patented element is the hinged level casing that enables the user to only need one spirit vial to measure level and plumb. While the body is perforated longitudinally to form a "sight" its detailed construction is specifically not claimed in the patent. Preferred construction method is listed as using cast iron.

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