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Sprocket
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==Film and paper== [[File:Optic Projection fig 226.jpg|thumb|Moving picture mechanism from 1914. The sprocket wheels a, b, and c engage and transport the film. a and b move with uniform velocity and c indexes each frame of the film into place for projection.]] Sprockets are used in the film transport mechanisms of [[movie projector]]s and [[movie camera]]s.<ref>[https://archive.org/details/motionpictureha00richgoog Motion picture handbook] By Frank Herbert Richardson</ref> In this case, the sprocket wheels engage [[film perforations]] in the [[film]] stock. Sprocket feed was also used for [[punched tape]] and is used for [[paper]] feed to some [[computer printer]]s.
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