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US Patent: 450,457
Spirit Level
Patentee:
Henry Green - Hartford, CT

USPTO Classifications:
33/334, 33/371

Tool Categories:
layout tools : levels
woodworking tools : hand drills : drill accessories

Assignees:
Acme Rule Company - Salisbury, CT

Manufacturer:
Not known to have been produced

Witnesses:
Fredk. E. Fuller
Alfred W. Jacobs

Patent Dates:
Applied: Aug. 04, 1890
Granted: Apr. 14, 1891

Patent Pictures:
USPTO pdf tiff
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Description:
Spirit level for attaching to drill rods and boring tools. Used for both horizontal drilling as well as angles in between. For intermediate angles, the nut holding the level is loosened and allowed to hang, indicating the angle.

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