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US Patent: 7,257
Divider or Compass
Patentee:
Dexter H. Chamberlain - Boston, MA

USPTO Classifications:
217/31, 33/558.06

Tool Categories:
layout tools : compasses : dividers

Assignees:
Homers & Ladd - Boston, MA

Manufacturer:
Not known to have been produced

Witnesses:
Gridly J.F. Bryant
Ezra Lincoln, Jr.

Patent Dates:
Granted: Apr. 09, 1850

Patent Pictures:
USPTO pdf tiff
Google Patents
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Description:
This divider provides a micrometer adjustment by cutting teeth in the outside of the arm, and providing a worm gear attached to a thembscrew to engage these teeth.

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