US Patent: 115,318 - Improvement in Apparatus for Illustrating Trigonometry


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US Patent: 115,318

Improvement in Apparatus for Illustrating Trigonometry

Patentee:

Edwin A. Hickman (exact or similar names) - Independence, MO

USPTO Classifications:

33/426

Tool Categories:

layout tools : protractors

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Granted:	May 30, 1871

Patent Pictures:

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Description:

This is a teaching aid for trigonometry, in which setting a protractor arm will automatically show all of the various tangents and secants with other arms.