"Teaching Aid" Prototype 1
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.
Handmade learning cards had holes punched in them. If the learner placed
probes on matching choices, the green light would signal success.
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