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US Patent: 110,657
Improvement in Calipers
Patentee:
William P. Hopkins (exact or similar names) - Lawrence, MA

USPTO Classifications:
33/558.1

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. H. Eames
O. K. Courier
A. W. Almqvist
S. S. Mabee

Patent Dates:
Granted: Jan. 03, 1871

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
Instead of the normal configuration of a spring forcing the legs apart and a screw holding them together, this design reverses the forces. The inventor claims that this allows the calipers to be used in tighter places.

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