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2. 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 ...

3. Transparency (projection) - Wikipedia

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

   Many overhead projectors are used with a flat-panel LCD which, when used this way, is referred to as a spatial light modulator or SLM. Data projectors are often based on some form of SLM in a projection path. An LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs. Not all projectors use SLMs ...

4. Magic lantern - Wikipedia

   en.wikipedia.org/wiki/Magic_lantern

   Utsushi-e is a type of magic lantern show that became popular in Japan in the 19th century. The Dutch probably introduced the magic lantern in Japan before the 1760s. A new style for magic lantern shows was introduced by Kameya Toraku I, who first performed in 1803 in Edo. Possibly the phantasmagoria shows (popular in the west at that moment ...

5. List of obsolete technology - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_technology

   Overhead projector and slide projector: Video projector: Primarily for continued use of older materials. Some teachers find the overhead projector more convenient for lectures depending on their teaching style. Phonograph and phonograph record: Audio cassette, 8 track tape, CD, digital audio: Used to play older or archived recordings.

6. 73 Brands That Are Still Made Right Here in the USA - AOL

   www.aol.com/73-brands-still-made-usa-123000180.html

   The plant was once used to make copiers and overhead projectors, and the facilities have expanded to focus on the adhesive notepads since 1985. ... modernist-style furniture that's back in vogue ...

7. Polylux (overhead projector) - Wikipedia

   en.wikipedia.org/wiki/Polylux_(overhead_projector)

   The Polylux was an overhead projector produced in the German Democratic Republic (GDR). It also functioned as a generic name for overhead projectors in the GDR. The Polylux was produced in the VEB ( Volkseigener Betrieb : people’s enterprise) Phylatex-Physikgeräte DDR, in Frankenberg near Chemnitz (then known as Karl-Marx-Stadt ).