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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 ...
Before phones were pocket-sized supercomputers, people had to stop if they wanted to make calls on the go. ... Overhead Projectors. Early 1960s-2015 ... Near the end of World War II, ...
The practical amount of enlargement (irrespective of the enlarger structure) will depend upon the grain size of the negative, the sharpness (accuracy) of both the camera and projector lenses, blur in the image due to subject motion, focus, and camera shake during the exposure. The intended viewing distance for the final product is a consideration.
35mm filmstrip projectors; Overhead presentation projectors (all models) Stereo cameras and stereo slide projectors through its TDC subsidiary; Slide Cube Projector, circa 1970; In 1934, Bell & Howell introduced their first amateur 8mm movie projector, in 1935 the Filmo Straight Eight camera, and in 1936 the Double-Run Filmo 8.
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 ).
Arthur Lyon & Co Ltd. was a company based in London, England founded by Arthur Anderson Lyon M.I.Mech.E. (1876–1962). Arthur Anderson Lyon was an engineer and inventor who appears in the patent records in 1911 with a portable signalling device, [1] but by mid-1916 his inventions move from signalling lamps to electric generators and batteries.
The projector was made by the manufacturing firm G. A. Harvey of Greenwich, which delivered a batch of ten projectors less than six weeks after receiving the drawings. By September, the firm had completed 1,000 launchers from the order for 2,500 as the Mark 1 for the Army and 3-inch Harvey L. S. Projector for the Navy, most of which were fitted ...
The Holman Projector was an anti-aircraft weapon used by the Royal Navy during World War II, primarily between early 1940 and late 1941. The weapon was proposed and designed by Holmans , a machine tool manufacturer based at Camborne, Cornwall .
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