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US Patent: 19,058
Mathematical Dividers
Patentee:
John E. Earle - Leicester, MA

USPTO Classifications:
33/558.04

Tool Categories:
layout tools : calipers

Assignees:
John E. Earle - Leicester, MA
Samuel Shepard - Nashua, NH

Manufacturer:
Not known to have been produced

Witnesses:
Oliver D. Seymour
J. S. Curtis

Patent Dates:
Granted: Jan. 05, 1858

Patent Pictures:
USPTO pdf tiff
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Description:
These dividers use a very unusual tapered cam to adjust the distance between the arms. Exactly what makes this qualify as "Mathematical" is not covered in the patent.

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