| 摘要 |
A card feeder for instructional devices, such as teaching machines, wherein a card, the forward face of which, having inscribed question and multiple choice answers, is presented to the viewer and with the rearward face being suitably adapted for cooperating with a photoemissive source to effect requisite energization of indicators for signaling the correctness or incorrectness of the answer chosen; said feeder incorporating normally mutually contacting drive and driven belts adapted for effecting separation of inadvertently mutually adhering cards moving therebetween to assure feeding of a single card into viewing position for accuracy in energizing the appropriate indicators.
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