Educational device

Details Educational device Educational device

1976-06-22

1977-05-10

Skogquist, Harland S.

35 9E, 35 31A, G09B 300

Patent

active

040219402

ABSTRACT:
An improved educational device comprises a hand held paddle-shaped device having a windowed front plate, a back plate, and rotatably interposed therebetween two circular disks, a first disk for displaying problem and solution indicia through the windowed front plate and a second disk for temporarily masking the display of the solution indicia. Tabs on the two disks permit both clockwise and counterclockwise rotation of the disks to a problem indicia displaying position. Subsequently, under the control of the operator of the improved educational device, the masking disk is rotated relative to the displaying disk, either manually as in one embodiment of the invention or automatically by a spring or other like means as in alternate embodiments to permit the display of both problem and solution indicia. As preferred, the display disk may be made easily interchangeable with other displaying disks having differing problem and solution indicia.

REFERENCES:
patent: 1438144 (1922-12-01), Stevenson
patent: 1728584 (1929-09-01), Wright
patent: 2797499 (1957-07-01), Lagerdahl
patent: 3523376 (1970-08-01), Gilliam et al.
patent: 3732632 (1973-05-01), Dyer
patent: 3928922 (1975-12-01), Rosenbaum

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