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US Patent: 371,294
Plumb Level for Boring Bits
Patentee: George Woods (exact or similar names) - 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 (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
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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