Educational apparatus

Details Educational apparatus Educational apparatus

1989-08-21

1990-11-27

Apley, Richard J.

Education and demonstration

Question or problem eliciting response

Image projector included in examining means

434 81, 434 96, 434 90, 40361, 40437, 40560, 353DIG3, 353DIG4, G09B 500, G09B 700

Patent

active

049732544

ABSTRACT:
Educational apparatus for use with an overhead projector has a transparent grid with horizontal and vertical indices for projecting a grid onto a wall screen. A plurality of removable cover pieces, keyed to the grid, cover up grid segments whereby when the transparent grid has pictorial material a student, or player, may project a particular grid segment by picking up the cover piece on that segment.

REFERENCES:
patent: 1262180 (1918-04-01), Davies
patent: 2330799 (1943-10-01), Coker et al.
patent: 3339288 (1967-09-01), Sacks
patent: 4043053 (1977-08-01), Kaye
patent: 4089125 (1978-05-01), Enz et al.

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