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US Patent: 71,279
Improvement in Adjustable Spirit Levels
Patrick Clifford - Holyoke, MA

USPTO Classifications:
33/385, 33/388

Tool Categories:
layout tools : levels : inclinometers

Patrick Clifford - Holyoke, MA
James Doyle - Holyoke, MA

Not known to have been produced

C. Blodgett
Donald Mackintosh
E. W. Brown
C. D. Washburn

Patent Dates:
Granted: Nov. 26, 1867

Patent Pictures:
Patrick Clifford Pat. Nov. 26, 1867
USPTO pdf tiff
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The level bubble is mounted on a swivel plate which is adjustable and calibrated so it could be reset to any pre-determined angle in relation to the straight-edge base on which it is mounted. This is an improvement on Clifford's June 11, 1867 patent (no. 65,726).

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