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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 ...
British researchers had found that the amount of electrical power required to camouflage an aircraft's underside in daylight was prohibitive; and that externally mounted light projectors (following the Canadian approach) unacceptably disturbed the aircraft's aerodynamics. [3] Yehudi lights were tested in B-24 Liberators from 1943.
A blackout curtain used in Auckland, New Zealand during World War II. Lights can simply be turned off or light can sometimes be minimized by tarring the windows of large public structures. In World War II, a dark blackout curtain was used to keep the light inside. Tarring the windows can mean a semi-permanent blackout status.
In spite of the security precautions, the entire Norden system had been passed to the Germans before the war started. A member of the German Duquesne Spy Ring , Herman W. Lang, who had been employed by the Carl L. Norden Corporation (manufacturers of the Norden bombsight), was able to provide vital details of the new bombsight to the Abwehr . [ 2 ]
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.
While there was certainly a Signalman rating before World War II (the Signalman rating is one of the oldest in the Navy), a specialized Signalman rating was established shortly after the war. Then, Signalmen were identified by the symbol of two crossed semaphore flags on the left sleeve of the uniform, integrated with their rank insignia.
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The use of the blue emergency light originates in Germany during World War II. As a result of the "Verdunkelung", a black-out measure for aerial defense from 1935, cobalt blue was regulated to replace the red color used until 1938 in German emergency vehicle lights.
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