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US Patent: 248,162
Combined Calipers and Rule
Patentee:
Peter D. Graham - Black Hawk, CO

USPTO Classifications:
33/558.01

Tool Categories:
layout tools : compasses : trammels
layout tools : calipers
layout tools : measurement gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. H. Bradley
John H. Foster
C. Neveux
C. Sedgewick

Patent Dates:
Applied: Mar. 05, 1881
Granted: Oct. 11, 1881

Patent Pictures:
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Description:
This is a really unusual combination tool. It consists of two sets of calipers, each with a sharp point on the back, mounted on a rule such that the entire apparatus may be used as a beam compass.Just to make it interesting, there is another reference face to allow it to be used as a measuring gauge.

It seems like all of the tools would interfere with each other, making none of them particularly useful.

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