Teaching aid

Details Teaching aid Teaching aid

1975-08-18

1976-07-20

Skogquist, Harland S.

35 35H, G09B 128

Patent

active

039698327

ABSTRACT:
A teaching aid or the like comprising an open frame, a plurality of slide members reciprocal in the frame, and a pair of lenses extending across the open frame perpendicular to the general direction of reciprocation of the slide members. Each slide member has a pair of opposite faces, each face having formed thereon various indicia in lines. An indicia line on one face of a slide corresponds to an indicia line in the same relative position along the slide member on the opposite face of the slide. The lenses may be magnifying if desired.

REFERENCES:
patent: 1289743 (1918-12-01), Hammond
patent: 2668371 (1954-02-01), Artmann
patent: 2952923 (1960-09-01), Calabrese
patent: 3758971 (1973-09-01), Tarrant
patent: 3765107 (1973-10-01), Cameron

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