US Patent: 181,236 - Improvement in Rulers and Protractors


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US Patent: 181,236

Improvement in Rulers and Protractors

Patentee:

George D. Wyckoff (exact or similar names) - Indianapolis, IN

USPTO Classifications:

33/485, D10/71

Tool Categories:

rules

layout tools : protractors

Assignees:

Henry Eitel - Indianapolis, IN

Manufacturer:

Unknown

Witnesses:

Patent Dates:
Applied:	Mar. 15, 1876
Granted:	Aug. 15, 1876

Patent Pictures: [ 1 | 2 ]

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Description:

This ruler/protractor has a pair of built-in pins to allow it to be easily affixed to a drawing board for marking, as well as a sliding fence to allow it to accurately lay off perpendicular lines.