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US Patent: 573,682
Spirit-Level and Plumb
Patentee:
William M. Morton - New Haven, CT

USPTO Classifications:
33/383

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

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Wm. H. Chapman
George E. Hall
J. E. Chapman

Patent Dates:
Applied: Feb. 03, 1896
Granted: Dec. 22, 1896

Patent Pictures:
USPTO pdf tiff
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Description:
This level uses vials mounted on pivoting frames, with screw adjustments on the end of each vial. This allows fine adjustment of the level bubbles.

It is not known who actually manufactured these levels, but known examples are marked "ROLLIS" with the patent date.

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