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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. VEB Polytechnik - Wikipedia

   en.wikipedia.org/wiki/VEB_Polytechnik

   In the GDR, it was mainly known for producing overhead projectors, called Polylux. The company was founded in 1870 as Reißzeugrichter and manufactured drawing table tools. In 1874 the founder Emil Oskar Richter invented the bow compass. After switching its focus to overhead projectors in the late 1960s, it was renamed to VEB Polytechnik.

4. 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.

5. 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 ).

6. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .

7. 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.

8. Liquid light show - Wikipedia

   en.wikipedia.org/wiki/Liquid_light_show

   Light from a liquid light show, being projected behind a guitarist Layers of colored mineral oil and alcohol move over the projector lens and produce changing color patterns. Liquid light shows (or psychedelic light shows ) [ not verified in body ] are a form of light art that surfaced in the early 1960s as accompaniment to electronic music and ...

9. Elmo (company) - Wikipedia

   en.wikipedia.org/wiki/Elmo_(company)

   As home video took its toll on the Super 8 scene, ELMO ceased production of their projectors, with the final models being the GS-1200 P Xenon and P Com in 1983. [6] Following this, the company began making CCD cameras in 1984, [ 1 ] introduced the EV-308 document camera in 1988, [ 7 ] and in the late 90s moved into educational technical equipment.