Operation
The Mutoscope worked on the same principle as the "flip book." The individual image frames were conventional black-and-white, silver-based photographic prints on tough, flexible opaque cards. Rather than being bound into a booklet, the cards were attached to a circular core, rather like a huge Rolodex. A reel typically held about 850 cards, giving a viewing time of about a minute. The reel with cards attached had a total diameter of about ten inches (25 cm); the individual cards had dimensions of about 2-3/4" x 1-7/8" (7 cm x 4.75 cm).
Mutoscopes were coin-operated. The patron viewed the cards through a single lens enclosed by a hood, similar to the viewing hood of a stereoscope. The cards were generally lit electrically, but the reel was driven by means of a geared-down hand crank. Each machine held only a single reel and was dedicated to the presentation of a single short subject, described by a poster affixed to the machine.
The patron could control the presentation speed only to a limited degree. The crank could be turned in both directions, but this did not reverse the playing of the reel. Nor could the patron extend viewing time by stopping the crank because the flexible images were bent into the proper viewing position by tension applied from forward cranking. Stopping the crank reduced the forward tension on the reels causing the reel to go backwards and the picture to move from the viewing position; a spring in the mechanism turned off the light and in some models brought down a shutter which completely blocked out the picture.
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