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In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
Slide projector light generation and collimation system: from left to right, mirror / reflector, bulb, condenser lens 1, green-tinted heat-absorbing glass, condenser lens 2; a centrifugal fan, used to cool the bulb, is visible at the top of the picture. A projector has three main optical elements: [3]: 39–40
Phantasmagoria was a form of horror theater that used one or more magic lanterns to project frightening images, especially of ghosts. Showmen used rear projection, mobile or portable projectors and a variety of effects to produce convincing necromantic experiences. It was very popular in Europe from the late 18th century to well into the 19th ...
It later diversified into other photographic products, mostly related to film transparencies, and established manufacturing plants in Europe, Japan and India. By the early 1960s, Sawyer's was the nation's second-largest manufacturer of slide projectors, and by 1965 slide projectors had surpassed View-Master reels and equipment as a percentage ...
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
At the same time, Gray also developed a Telojector, a gun-turret style slide projector for 2 in × 2 in (51 mm × 51 mm) slides which had two projectors, facilitating easier lap dissolves between the two. The Telop III was introduced in 1954, was a refinement of the previous makes. Reduced to a single-channel version of the Telop, the Telop III ...
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