NEW KINEMA PROJECTOR LAMP
In practically everything but the searchlight and the kinema projector, the electric carbon arc lamp has yielded place to the electric incandescent tungsten filament lamp of the gas-filled type, so c-atled because the bulb is filled with an inert gas—generally the gas argon, whose existence wns discovered by the late Sir William Ram-ay. Now the supremacy of the carbon arc lamp in the projector field is being challenged by a special bulb lamp invented by a British firnn in which the light is supplied by tn electric arc between two small heads of tungsten. An intense point of light is thus obtained. Larger lannis, are made with a square plate of tungsten (about half a' square. inch, in arri), which becomes white nil over and producers a light of as much as four thousand candle power. Smaller sizes give five hundred and one thousand candle power. For kinenui projectors and many other purjioses these new lamps have many advantages over the old-fashioned carbon iirc. They can be run off any electrical circuit, whether continuous or alterndt- j irg.
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Dominion, Volume 14, Issue 160, 2 April 1921, Page 5
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182NEW KINEMA PROJECTOR LAMP Dominion, Volume 14, Issue 160, 2 April 1921, Page 5
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