Teaching protractor

Details Teaching protractor Teaching protractor

1995-05-24

1996-12-31

Fulton, Christopher W.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33 1N, 33534, G01B 524

Patent

active

055882188

ABSTRACT:
A protractor is disclosed that reduces the time to teach students how to measure and understand angles, and significantly improves overall student comprehension of angles. The protractor comprises two generally flat members each having a straight edge portion radial to a pivot point to which the members are rotatably attached such that the straight edges define an open sector area having an angle formed by the two edges, one member having angle indicia on a semi-circular portion thereof, and the other member having an indicator portion that intersects the angle indicia to enable the angle defined by the two straight edges to be measured. The protractor offers a significant increase in convenience in measuring and drawing angles.

REFERENCES:
patent: 713096 (1902-11-01), Hess
patent: 936746 (1909-10-01), Szymanski
patent: 1650553 (1927-11-01), Tresidder
patent: 2641842 (1953-06-01), Porter, Jr.
patent: 2959861 (1960-11-01), Stromquist
patent: 4060900 (1977-12-01), Greenwood
patent: 4535542 (1985-08-01), Liu et al.

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