US Patent: 450,457 - Spirit Level


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US Patent: 450,457

Spirit Level

Patentee:

Henry Green (exact or similar names) - Hartford, CT

USPTO Classifications:

33/334, 33/371

Tool Categories:

layout tools : levels

woodworking tools : hand drills : drill accessories

Assignees:

Acme Rule Co. - 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:

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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.