"Teaching Aid" Prototype 2
![](Prototype-2a.JPG)
This version of my "teaching aid" was more elaborate. It could have
different patterns on the contact bed. It also kept score!
![](Prototype-2b.JPG)
The electronic score box, tallied the number of right and wrong answers. A
big disadvantage of this version was its complexity, cumbersomeness, and cost.
![](Prototype2Discl_small.JPG)
(See
disclosure document) (PDF 0.10 MB)
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