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Overhead projector in operation during a classroom lesson
An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film (also known as "viewfoils", "foils" or "transparencies") with the image to be projected either printed or hand-written/drawn. These transparent sheets are placed on the glass platen of the projector, which has a light source below it and a projecting mirror and lens assembly above it (hence, "overhead"). They were widely used in education and business before the advent of video projectors.
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An overheadprojector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view...
slide projectors and overheadprojectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and...
generated by the light source. Opaque projectors are not as common as the overheadprojector. Opaque projectors are typically used to project images of...
modern equivalent of the slide projector or overheadprojector. To display images, LCD (liquid-crystal display) projectors typically send light from a metal-halide...
for screens targeted for use with digital projectors, movie projectors, overheadprojectors and slide projectors, although the basic idea for each of them...
simulation game created by Nintendo in 1973. The game consisted of an overheadprojector which displayed moving targets behind a background; players would...
polarization of light in a spatially varying manner. A simple example is an overheadprojector transparency. Usually when the term SLM is used, it means that the...
Karl-Marx-Stadt). In the GDR, it was mainly known for producing overheadprojectors, called Polylux. The company was founded in 1870 as Reißzeugrichter...
Overhead cable, for signal transmission Overheadprojector, a display system Overhead storage, for example overhead storage bins, racks, shelves, cabinets...
A slide projector is an optical device for projecting enlarged images of photographic slides onto a screen. Many projectors have mechanical arrangements...
could be a 35 mm slide viewed with a slide projector or a transparency viewed with an overheadprojector. In the digital age, a slide most commonly refers...
movie theaters, and concerts, having mostly replaced overhead, slide and conventional film projectors. In schools and other educational settings, they are...
by a presenter using an apparatus such as a carousel slide projector or an overheadprojector, but now the use of an electronic video display device and...
claims to be the largest European manufacturer of wood-cased pencils, overheadprojector pens, mechanical pencils, leads, erasers, and modelling clays. Staedtler...
types of projectors. These include slide projectors, overheadprojectors, and computer projectors. Slide projectors are the oldest form of projector, and...
transparent photograph Transparency (projection), for use with an overheadprojector Electromagnetically induced transparency Transparent goby, a fish...
display AMOLED display Plasma (P) display Quantum dot (QD) display An overheadprojector can be considered a type of electronic visual display. Additionally...
By that afternoon an email about my hitting the Off button on the overheadprojector was crisscrossing the world. Talk about consternation! It was as if...
through the water. Some small ripple tanks fit onto the top of an overheadprojector, i.e. they are illuminated from below. The ripples on the water show...
of computers, projectors, and popular presentation programs such as Microsoft PowerPoint in meeting rooms meant that overheadprojectors became less frequently...
overhead display or LCD panel) is a device that, although no longer in production, was used as a data projector is today. It works with an overhead projector...
recordings. Overheadprojector and slide projector Video projector Primarily for continued use of older materials. Some teachers find the overheadprojector more...
than three operators and ten or so projectors. Second, American shows were generally built around the overheadprojector with the liquids in large clock...
designed for children or for temporary writing (as with a whiteboard or overheadprojector) typically use non-permanent inks. Large markers used to label shipping...
test of coagulation and fibrinolysis Overhead press, a weight training exercise with many variations Overheadprojector, a device that uses light to project...
at what we're doing, to 'examine ourselves.' Satire acts like an overheadprojector, taking something that people usually ignore and projecting it up...
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