"Teaching Aid" Prototype 1
![](Prototype-1-Wiring.jpg)
This original "learning machine" was just a card holder made out of plastic, with
electrical contact screws, wires, two electrical probes, and a green light. When the probes made electrical
contact, the light lit up.
![](Prototype-1-MatchingCard.jpg)
Handmade learning cards had holes punched in them. If the learner placed
probes on matching choices, the green light would signal success.
![](Prototype-1-MultipleChoiceCard.jpg)
A variety of cards were made, including multiple choice question cards. One
probe was placed on the question and the other was used to select one of several
possible answers.
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