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US Patent: 371,294
Plumb Level for Boring Bits
Patentee:
George Woods - Needham, MA

USPTO Classifications:
33/334, 33/369, 33/391, 408/16

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Alaban Andren
Henry Chadbourn

Patent Dates:
Applied: Jan. 26, 1887
Granted: Oct. 11, 1887

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
Pendulum pointer is used to ensure the bit is held plumb. In the text he also indicates a similar device could be attached to a plane as well.

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