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Some projectors have a third, mechanically controlled douser that automatically closes when the projector slows down (called a fire shutter or fire douser), to protect the film if the projector stops while the first douser is still open. Dousers protect the film when the lamp is on but the film is not moving, preventing the film from melting ...
Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
In order that these parts [of the film projector] may operate as described, it is essential that the loop of slack film be maintained at all times ready for the intermittingly-acting device and also that the slack-manipulating and the intermittingly-moving devices be positively driven by mechanism which will absolutely insure the presence of ...
Projection screen in a movie theater Home theater projection screen displaying a high-definition television image. A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience.
All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.
Unlike other projectors of its hi-power kind, the DP70 did not offer forced-air cooling of the film itself, which is known to be a key feature to prevent overheating of the film and the major nitrate-fire prevention measure. A water cooled pre-shield just assists in keeping the gate and metal parts cold, not the film. [10]
Cinématographe Lumière at the Institut Lumière, France. Cinematograph or kinematograph is an early term for several types of motion picture film mechanisms. The name was used for movie cameras as well as film projectors, or for complete systems that also provided means to print films (such as the Cinématographe Lumière).