US Patent: 19,058 - Mathematical Dividers


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US Patent: 19,058

Mathematical Dividers

Patentee:

John E. Earle (exact or similar names) - 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:

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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.