Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent
1985-03-22
1987-11-10
Grieb, William H.
Education and demonstration
Mathematics
Geometry, trigonometry, or physical mathematic model structure
434404, G09B 2304
Patent
active
047054786
ABSTRACT:
A visual aid in which a background sheet, FIG. 1, features a diagram. It is desired to demonstrate that one part of the diagram, in this case the angle ACD can fit exactly on another part, in this case the angle ABC. The two parts are jointly used as the basis of a geometrical construction to locate the position of the center of rotation P. A transparent sheet (FIG. 2) is laid over the background sheet. The point Q is marked corresponding to P and the two sheets are pivotally assembled through P and Q. The relevant part of the background diagram, in this case the angle ACD is now copied onto the overlay sheet, in this case angle G. Pivotal movement of the overlay sheet will allow angle G to be alternately superimposed on angles ACD or ABC. The tongue T, fits in the slot S to limit the pivotal movement.
REFERENCES:
patent: 1170537 (1916-02-01), Holmes
patent: 2520347 (1950-08-01), Talcott
patent: 3021058 (1962-02-01), Horton
patent: 3377718 (1968-04-01), Savin
patent: 4282655 (1981-08-01), Tinman
Cenco Teacher Guide No. 5, "Angle Measurement", .COPYRGT.1965.
Physics Research Labs Publication entitled "Transparent Visual-Aids", pp. 1, 2, 3 only.
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