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US Patent: 12,384
Spirit Level
Patentee: Hampton W. Evans (exact or similar names) - Philadelphia, PA USPTO Classifications: 33/388 Tool Categories: layout tools : levels : inclinometers layout tools : levels : level adjustments Assignees: None Manufacturer: Not known to have been produced Witnesses: John P. Cheston W. H. McNamee	Patent Dates: Granted: Feb. 13, 1855 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a fairly standard inclinometer, with a clever (and complicated) spring-loaded retainer to hold the level vial in the proper position.

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