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US Patent: 251,200
Calipers
Patentee:
Charles P. Fay - Chicopee Falls, MA

USPTO Classifications:
33/558.07

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
W. Fay and Co. - Chicopee Falls, MA

Witnesses:
Wm. F. Fay
H. A. Chapin
J. D. Garfield
Chas. Bill

Patent Dates:
Applied: Sep. 21, 1881
Granted: Dec. 20, 1881

Patent Pictures:
USPTO pdf tiff
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Description:
These calipers use a central screw to drive a restraining collar up and down the legs of a caliper to control the distance. Examples of this tool are known, but they are not marked with the manufacturer name. They were probably produced by the Fay and Company (given that Wm. Fay is a witness here), but this is just a guess.

Another famous name in tool manufacturing show up as a witness here: Hermon Chapin, a major manufacturer of planes and rules.

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