| Film, Movie Camera Accessories Article | The intermittent mechanism or intermittent movement is the device by which film is regularly advanced and then held in place for a brief duration of time in a movie camera or movie projector. This is in contrast to a continuous mechanism, whereby the film is constantly in motion and the image is held steady by optical or electronic scanning methods. The reason the intermittent mechanism "works" for the viewer is because of a psychological phenomenon called persistence of vision.
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