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US Patent: 121,088
Improvement in Spirit Levels
Patentee:
Leonard Leroy Davis - Springfield, MA

USPTO Classifications:
33/385

Tool Categories:
layout tools : levels : wooden levels

Assignees:
None

Manufacturer:
Leonard L. Davis Co. - Springfield, MA

Witnesses:
J. P. Buckland
B. B. Belcher

Patent Dates:
Applied: Oct. 01, 1870
Granted: Nov. 21, 1871

Patent Pictures:
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Description:
Adjustable feature that allows easy replacement and adjustment of the spirit level. The adjusting screw has an offset recess to accept the vial tube which when turned adjusts the position of the vial.

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