Education and demonstration – Mathematics – Arithmetic
Patent
1988-01-29
1990-04-24
Coven, Edward M.
Education and demonstration
Mathematics
Arithmetic
434215, 434404, 235 88M, 235 88N, 235 78M, 235 78N, G09B 122, G09B 2302
Patent
active
049200330
ABSTRACT:
A demonstrative teaching apparatus for teaching the relationship between variable pictorial and/or graphic displays and their respective numerical values, in which the entire apparatus is positioned within an apparatus housing. The apparatus housing incorporates viewing areas on its front and rear sides so as to provide optical display of the relevant teaching portions of the apparatus. The front viewing area reveals the position of the segmented display while the rear viewing area reveals numerical indicia corresponding to the display of segments appearing through the first viewing area. The segmented display and, in turn, its respective numerical indicia, can be increased or decreased by forward or reverse rotation of a circular disk. The circular disk is precluded from excessive rotation in either direction through stopping mechanisms which limit the inadvertent winding or unwinding of the segmented display.
REFERENCES:
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patent: 2949681 (1960-08-01), Knefeli
patent: 3024540 (1962-03-01), Orth
patent: 3544768 (1970-12-01), Warner
patent: 4611113 (1986-09-01), Halstead
patent: 4634385 (1987-01-01), Stemper
Coven Edward M.
Szczepanik Valerie
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