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US Patent: 99,961
Improvement in Calipers
Patentee:
William Slar (exact or similar names) - Franklin, PA

USPTO Classifications:
33/558.01

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Patrick Canning
J. R. Campbell
E. W. Anderson
D. D. Kane

Patent Dates:
Granted: Feb. 15, 1870

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Ralph Brendler
Description:
This caliper design feature a pair of adjustable graduated arcs, one for reading inside measurements and one for reading outside measurements.

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