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2. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   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.

3. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...

4. Magic lantern - Wikipedia

   en.wikipedia.org/wiki/Magic_lantern

   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 ...

5. Slide projector - Wikipedia

   en.wikipedia.org/wiki/Slide_projector

   Medium-format slide projectors, for medium-format slides larger than 35mm. [citation needed] Specialised large-format slide projectors for large transparencies of 18 × 18 cm (7.1 × 7.1") or larger. [citation needed] Related devices: Overhead projectors, for page-sized transparencies; Slide viewer, for direct viewing of a magnified image of a ...

6. Sawyer's - Wikipedia

   en.wikipedia.org/wiki/Sawyer's

   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 ...

7. Keystone View Company - Wikipedia

   en.wikipedia.org/wiki/Keystone_View_Company

   In 1905 Keystone View Company began its Educational Department, selling views and glass lantern slides (the 4 x 3.25 inch ancestors of the better-known 2 x 2 inch slides containing transparencies on film, which eventually replaced them) to schools throughout the country. They also produced lantern slide projection equipment.