Patent Model - Expansive Bit
Maker and role
Alexander Hall, Patentee
Production date
Apr 14 1857
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Object detail
Media/Materials
Metal
Measurements
17 x 16 x 1 1/2" (43.2 x 40.6 x 3.8cm)
Description
Hall's patent "consists in allowing the bits with their turned lips to slide through a mortise in the boring tool, and in holding said bits when adjusted in the mortise by a pin, which not only gives the bits more firmness, and stability in the boring tool, but allows greater facility for removing or adjusting the bits, as well as economy in their construction." (Patent Number 17,038)
Collection
Object number
2015.14.192
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