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In the early 1980s–1990s, overhead projectors were used as part of a classroom computer display/projection system. A liquid-crystal panel mounted in a plastic frame was placed on top of the overhead projector and connected to the video output of the computer, often splitting off the normal monitor output.
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 .
A more robust version, the Ektagraphic Carousel projector, was produced for the industrial and trade show market. It was basically the same projector, but designed for operation for events lasting for days or weeks. It was available with a zoom lens, enabling the projector to be positioned away from the middle of the audience.
Created Date: 8/30/2012 4:52:52 PM
Kodak introduces the first 8 mm amateur motion picture film, cameras, and projectors. [16] 1934 – The 135 film cartridge is introduced, making 35 mm easy to use for photography. 1935 Becky Sharp, the first feature film made in the full-colour "three-strip" version of Technicolor, is released.
The earliest pipes were made of clay, and are found at the Temple of Bel at Nippur in Babylonia. [127] [b] 4000 BC: Oldest evidence of locks, the earliest example discovered in the ruins of Nineveh, the capital of ancient Assyria. [130] 4000 BC – 3400 BC: Oldest evidence of wheels, found in the countries of Ukraine, Poland, and Germany. [131 ...
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
The slide images were too small for unaided viewing, and required enlargement by a projector or enlarging viewer. Photographic film slides and projectors have been replaced by image files on digital storage media shown on a projection screen by using a video projector , or displayed on a large-screen video monitor .