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US Patent: 151,824
Improvement in Calipers
Patentee:
James W. Barnastee (exact or similar names) - East Somerville, MA

USPTO Classifications:
33/558.05

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
L. Marrett
W,. A. Nason
Jas. E. Hutchinson
John R. Young

Patent Dates:
Applied: Mar. 06, 1874
Granted: Jun. 09, 1874

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
These calipers use an unthreaded bar held in place by a set screw for coarse adjustment, and a small threaded bar set into the end of the unthreaded bar for fine adjustment.

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