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US Patent: 52,579
Improvement in Spirit-Levels
Patentee:
Rudolph Ledig - Newark, NJ

USPTO Classifications:
33/387

Tool Categories:
layout tools : levels : inclinometers
layout tools : levels : level adjustments

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Theo. Tusch
J. W.B. Covington
Wm. E. Lyon
James T. Graham

Patent Dates:
Granted: Feb. 13, 1866

Patent Pictures:
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Description:
This is a level and inclinometer that uses a pivoting vial to adjust or measure angles. The pivot is controlled by a fine thumbscrew for accurate adjustment.

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