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US Patent: 271,401
Micrometer Indicating Gage
Patentee:
Merrick M. Barnes (exact or similar names) - Boston, MA

USPTO Classifications:
33/823

Tool Categories:

Assignees:
None

Manufacturer:
A. J. Wilkinson - Boston, MA

Witnesses:
Henry W. Williams
Joseph Ishbaugh

Patent Dates:
Applied: Nov. 03, 1882
Granted: Jan. 30, 1883

Patent Pictures: [ 1 | 2 ]
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Description:
Micrometer with adjustable beam to allow it to be used for measuring much larger items. Design is such that it allows rapid checking of items against a set thickness so that when an item is the correct size both the mark on the indicating arm and the mark on the beam will coincide.

A sample appeared on one of Patrick Leach's tool lists. It was marked with this patent date and July 3, 1883 for Barnes' 280,339

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