Students multi-function protractor

Details Students multi-function protractor Students multi-function protractor

1992-01-29

1993-02-23

Cuchlinski, Jr., William A.

Geometrical instruments

Straightedge type

Base attached

33 26, 33679, 33403, B43L 1308

Patent

active

051878739

ABSTRACT:
A protractor including a base having a curved surface formed in an upper portion, a disc including a circular outer peripheral surface for slidable engagement with the curved surface of the base, the disc including an opening, a pair of flanges formed in parallel in the opening, and a slide including two end portions slidably engaged with the flanges of the disc so that the slide can be guided to slide along the flanges, whereby various geometric figures can be drawn by the protractor when the disc rotates relative to the base and when the slide slides along the flanges.

REFERENCES:
patent: 224811 (1880-02-01), Wilson
patent: 1927992 (1933-09-01), Pulver
patent: 2432300 (1947-12-01), Ellis
patent: 3548503 (1970-12-01), Feltenberger
patent: 3925899 (1975-12-01), Hesse et al.
patent: 4222171 (1980-09-01), Malacheski
patent: 4791733 (1988-12-01), Pan et al.

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