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US Patent: 45,529
Improvement in Calipers
Patentee:
Robert D.O. Smith - Washington, DC

USPTO Classifications:
33/801

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
P. J. Dodge
W. C. Dodge
Andrew Whiteley

Patent Dates:
Granted: Dec. 20, 1864

Patent Pictures:
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Description:
This is a caliper with two attached scales: one for reading inside dimensions and one for reading outside dimensions. The dimension can be read directly by using the zero point of the other scale.

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