The Collaborative International Dictionary
Projector \Pro*ject"or\, n. [Cf. F. projeteur.]
One who projects a scheme or design; hence, one who forms fanciful or chimerical schemes.
an optical instrument which projects an image from a transparency or an opaque image onto a projection screen or other surface, using an intense light and one or more lenses to focus the image. The term projector by itself is usually used for projection of transparent images by passing the light beam through the image; a projector which projects an image of an opaque object is now ususally referred to as an overhead projector. In projection of this latter form the projection is accomplished by means of a combination of lenses with a prism and a mirror or reflector. Specific instruments have been called by different names, such as balopticon, radiopticon, radiopticon, mirrorscope, etc.
Slide projector a projector for displaying images from individual transparencies (slides), each mounted in a separate frame suited to the mechanics of the projector.
movie projector a projector which displays a series of images from a roll of transparent film in rapid sucession, thus giving the impression of showing a scene with motion as it originally was recorded.
overhead projector see projector, above.
Cinematograph \Cin`e*mat"o*graph\, n. [Gr. ?, ?, motion + -graph.]
an older name for a movie projector, a machine, combining magic lantern and kinetoscope features, for projecting on a screen a series of pictures, moved rapidly (25 to 50 frames per second) and intermittently before an objective lens, and producing by persistence of vision the illusion of continuous motion; a moving-picture projector; also, any of several other machines or devices producing moving pictorial effects. Other older names for the movie projector are animatograph, biograph, bioscope, electrograph, electroscope, kinematograph, kinetoscope, veriscope, vitagraph, vitascope, zo["o]gyroscope, zo["o]praxiscope, etc.
The cinematograph, invented by Edison in 1894, is the result of the introduction of the flexible film into photography in place of glass.
A camera for taking chronophotographs for exhibition by the instrument described above.