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A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction. It is usually constructed so that it can be swiveled about.
[citation needed] Signals may be of the searchlight, color light, position light, or color position light types, each displaying a variety of aspects which inform the locomotive operator of track conditions so that they may keep their train under control and able to stop short of any obstruction or dangerous condition.
The 4th Battalion, Queen's Royal Regiment (West Surrey) (4th Queen's) was a volunteer unit of the British Army from 1859 to 1961. Beginning from small independent units recruited in the South London suburbs, it was attached to the Queen's Royal Regiment (West Surrey) and served in the Second Boer War, the First World War, and the Third Anglo-Afghan War.
It was a tank fitted with a powerful carbon-arc searchlight to support night-time attacks. The War Office ordered 300 such lamps in 1940. [ 7 ] During the latter stages of the war, the British Army created Moonlight Batteries, Royal Artillery that specialised in providing 'artificial moonlight', otherwise known as 'movement light' or ' Monty's ...
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Klieg lights. A Klieg light is an intense carbon arc lamp especially used in filmmaking.It is named after inventor John Kliegl and his brother Anton Kliegl.Klieg lights usually have a Fresnel lens with a spherical reflector or an ellipsoidal reflector with a lens train containing two plano-convex lenses or a single step lens.
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