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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 .
In 1999, [9] digital cinema projectors were being tried out in some movie theaters. These early projectors played the movie stored on a computer, and sent to the projector electronically. Due to their relatively low resolution (usually only 2K) compared to later digital cinema systems, the images at the time had visible pixels.
Overhead projectors were introduced into U.S. military training during World War II as early as 1940 and were quickly being taken up by tertiary educators, [14] and within the decade they were being used in corporations. [15] After the war they were used at schools like the U.S. Military Academy. [13] The journal Higher Education of April 1952 ...
These were adapted with a mechanism that spins the disc and a shutter system. Duboscq produced some in the 1850s and Thomas Ross patented a version called "Wheel of life" in 1869 and 1870. [82] The Choreutoscope was purportedly invented around 1866 by the Greenwich engineer John Beale, and demonstrated at the Royal Polytechnic. It projected six ...
The projector was used in a public screening in New York City beginning April 23, 1896 and lasting more than a week. Working for Edison, Armat refined the projector in 1897 by replacing the beater mechanism with a more precise Geneva drive , duplicating an invention made a year earlier in Germany by Oskar Messter and Max Griewe and in England ...
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 Photographic film slides and projectors have been replaced by image files on digital storage media shown on a projection screen by using a video projector , or displayed on a large-screen video monitor .
Victor offered many models of 16mm projectors, most with only minor variations, but prior to military contracts won during World War II, all were made and sold in very small numbers, from 20 units to usually no more than a couple of thousand units. The company was a large producer of lantern slides using their "Featherweight" method- a one ...
Vitascope was an early film projector first demonstrated in 1895 by Charles Francis Jenkins and Thomas Armat. They had made modifications to Jenkins' patented Phantoscope, which cast images via film and electric light onto a wall or screen. The Vitascope is a large electrically-powered projector that uses light to cast images.