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15 mins Color 17 mins B/W abstract answer approach audio cassette Audiovisual Instruction basic battery camera cassette systems cassette tape recorder chalkboard class fire Columbia Broadcasting System communication cone cost darkened room device disadvantages educational technology educational television electronic video recording equipment example experience feedback film filmstrip adaptor flannel board individual insert Insert film instructional media involves knob knurled bolt lamp switch learner lens barrel listening machine malapropism Marshall McLuhan materials and media McLuhan media and materials method motion picture projector non-projected materials Norelco opaque projector overhead projector photography playback practice presentation problem programed instruction projected materials projectionist reality reel reported retrieval rewind scheduling school radio scotch tape screen senses sensory situation slide projector slot sound speed graphic spirit duplicator student learning teaching technique threading transparencies turn usually utilization verbalism words