US Patent: 1,294,935 - Angle and Arc Dividing Ruler


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US Patent: 1,294,935

Angle and Arc Dividing Ruler

Patentee:

USPTO Classifications:

33/1AP, 33/471

Tool Categories:

rules

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Charles H. Liebman

G. B. Marshall

Patent Dates:
Applied:	Apr. 12, 1918
Granted:	Feb. 18, 1919

Patent Pictures:

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Description:

This draftsman's rule features a number of special markings to allow it to easily trisect any angle, as well as to divide arcs into 2,4,or 8 equal parts.