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One of the primary differentiators between slide projectors was the form factor of the cartridges used to hold and, in many cases, store slides. Some automated slide projectors offered slide trays with straight, rectangular shapes, [12] which were popular in Europe; these use an arm, moving laterally, to extract a slide from the cartridge for ...
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 ...
A carousel slide projector. The example pictured is a Kodak Carousel model 4400, dating from the mid-1980s. A carousel slide projector is a slide projector that uses a rotary tray to store slides, used to project slide photographs and to create slideshows. It was first patented on May 11, 1965, by David E. Hansen of Fairport, New York.
The Slide Cube Projector is a slide projector and system, manufactured and marketed by Bell & Howell, which was introduced in 1970 and marketed through the 1980s.The projector derived its name from its transparent cubical plastic slide storage magazine, approximately 5.5 cm (2.2 in) in each dimension (a bit larger than a standard 135 film slide mount), that held 36 to 44 slides, depending on ...
It was increasingly used for education during the 19th century. Since the late 19th century, smaller versions were also mass-produced as toys. The magic lantern was in wide use from the 18th century until the mid-20th century when it was superseded by a compact version that could hold many 35 mm photographic slides: the slide projector.
The first large-format slide projectors were built in the middle of the 20th century as background projectors for theaters and opera houses. From the early 50', the german Brand Reiche&Vogel was offering in a catalog a 2000w slide projector using 4.75"x 4.75" (12x12cm) slide or a scroller for film strip of the same size.