Search results
Results from the WOW.Com Content Network
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 ...
Shows could be as simple as a single operator and two or three modified slideprojectors or overhead projectors and a couple of color wheels or as complex as shows with ten or more operators, 70 plus projectors (including liquid slide, liquid overhead, movie and still image models plus a vast array of highly advanced (for the time) special ...
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.
Devices that rely on 3G, including old smartphones, some medical and security alarms, some car navigation and entertainment services, and old tablets and e-readers, stopped working by the end of 2022.
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 ...
Gibson guitars are among the most iconic instruments in popular music, ... The plant was once used to make copiers and overhead projectors, and the facilities have expanded to focus on the ...
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.
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 ...