Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent
1982-12-22
1984-03-06
Grieb, William H.
Education and demonstration
Mathematics
Geometry, trigonometry, or physical mathematic model structure
G09B 2304
Patent
active
044351623
ABSTRACT:
A transparent face plate has inscribed thereon a first circle surrounded by graduations which divide it into zero through 360.degree.. Two lines of transparency, which are denoted sine and cosine, respectively, intersect at right angles at the center of the circle, and at opposite sides of the center are divided into decimal graduations 0.01 through 1.0. Mounted to rotate beneath the base plate is a disc having inscribed on its face an indicator circle having a radius equal to one half of that of the first-named circle, and located in offset relation to the latter, so that the indicator circle extends at one diametral side through the center of the first circle, and at its opposite diametral side registers tangentially with said first circle. A pointer is inscribed on the face of the disc to be viewable against the degree graduations on the face plate, so that when the disc is rotated, the indicator circle thereon is swung successively beneath the intersecting transparent lines of the face plate, so that where the periphery of the indicating circle intersects one of these lines the decimal equivalent of the corresponding trigonometric function will be indicated.
REFERENCES:
patent: 2234896 (1941-03-01), De Turk
patent: 2521930 (1950-09-01), McPartlin
patent: 3021058 (1962-02-01), Horton
patent: 3042301 (1962-07-01), Seale
patent: 3347458 (1967-10-01), Thiel
patent: 3359653 (1967-12-01), Redfern
patent: 3377718 (1968-04-01), Savin et al.
patent: 3827163 (1974-08-01), Grimes
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