A wheel equipped with projections along its rim that are used to engage with the links of a chain, the perforations along the edge of a strip of…

the objective lens in a film or slide projector, which projects an enlarged image.

An automatic safety device for shutting off light, esp. the light of a cinema-projector.

technical. The mechanism in a cinematographic camera or projector that holds each frame momentarily behind the lens.

transferred. A mechanical or other contrivance resembling a claw; e.g. a curved iron with sharpened extremity for grappling or tearing; the back part…

Cinematography. The device or spool for gathering up film after exposure in a projector or camera.

Cinematography and Theatre. In a projector or spotlight: a shutter or similar device that blocks outgoing light.

the part of a sound head where the sound track is scanned as the film passes through it.

the part of a film projector concerned with producing an electrical signal from the sound track (see also quot. 1959 sound camera n.).

Film. A mechanism which moves film past the aperture of a camera, projector, etc. Also: the rate at which this movement takes place.