TAD1754838: A teaching machine: made in the United States by professor Burrhus Skinner (Harvard university) in the 50's. It is a box pierced with a light and provided with a lever to be used to teach the orthography, the arithmetic in primary schools. It's a list of questions and answersin the box. A question appears in the light, the pupil registers his answer and by operating the lever he obtains the correct answer, photo NARA / Bridgeman Images