Geneva Mechanisms are widely used in motion picture film projectors to intermittently advance film through a film gate having a projection aperture. The film is moved or advanced by a Geneva Mechanism (also known as a “Maltese Cross”) until an image frame is in alignment with the projection aperture.
In watches, the "drive" wheel is the one that winds up the spring, and the Geneva wheel with four or five spokes and one closed slot prevents overwinding (and also complete unwinding) of the spring. ... The Iron Ring Clock uses a Geneva mechanism to provide intermittent motion to one of its rings.
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