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2. Philips DP70 - Wikipedia

   en.wikipedia.org/wiki/Philips_DP70

   The price asked for a double set without lenses asked in West-Germany in 1956 was 42,510.00 Marks, which at the rate of exchange at that time (4:1), related to $10,627.50 for the pair, or $5,313.75 per projector. [8] That price was higher than 35mm only projectors, but still reasonably low if compared to competitors like Bauer U2. [9]

3. Slide projector - Wikipedia

   en.wikipedia.org/wiki/Slide_projector

   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

4. Movie projector - Wikipedia

   en.wikipedia.org/wiki/Movie_projector

   35 mm movie projector in operation Bill Hammack explains how a film projector works. A movie projector (or film projector) is an opto-mechanical device for displaying motion picture film by projecting it onto a screen. Most of the optical and mechanical elements, except for the illumination and sound devices, are present in movie cameras.

5. Slide cube projector - Wikipedia

   en.wikipedia.org/wiki/Slide_Cube_projector

   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 ...

6. Motiograph - Wikipedia

   en.wikipedia.org/wiki/Motiograph

   Motiograph projector, c. 1911. Motiograph (originally The Enterprise Optical Manufacturing Company) was a film equipment company established by Alvah C Roebuck in Chicago in 1896. The company manufactured theater projectors and speakers. [1] [2] [3] Their Optiograph 35 mm film projector was first introduced in 1898 and sold via catalogs ...

7. 35 mm movie film - Wikipedia

   en.wikipedia.org/wiki/35_mm_movie_film

   35 mm film is a film gauge used in filmmaking, and the film standard. [1] In motion pictures that record on film, 35 mm is the most commonly used gauge. The name of the gauge is not a direct measurement, and refers to the nominal width of the 35 mm format photographic film, which consists of strips 1.377 ± 0.001 inches (34.976 ± 0.025 mm) wide.