Multipurpose disk protractor

Details Multipurpose disk protractor Multipurpose disk protractor

1976-09-30

1977-11-15

Aegerter, Richard E.

Geometrical instruments

Miscellaneous

Light direction

33141R, G01B 312

Patent

active

040579026

ABSTRACT:
A circular disk protractor made of a transparent plate material and having a peripheral circumference of 400 mm has a length scale graduated in millimeters around the circumferential edge thereof from an origin, an angle scale graduated in degrees of angle around a circle concentric with the disk from an origin angularly coincident with the origin of the length scale, and a polar distance scale comprising a plurality of concentric radially spaced apart circles which are concentric with the disk and constitute graduations to indicate distances in millimeters from the center of the disk.

REFERENCES:
patent: 925082 (1909-06-01), Davenport
patent: 1346250 (1920-07-01), Puring
patent: 2003172 (1935-05-01), Burt
patent: 3795053 (1974-03-01), Burke

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