Handbook for motion picture and stereopticon operators . STEREOPTICON MOTION PICTURE ARC. 64 Motion Picture (in series with the lamp), with an attendant gen-eration of heat in the rheostat. To successfully illuminate a large screen a heavycurrent is necessary and a great deal of heat isgenerated in the lamp, which endangers the filmowing to its inflammable nature, and for thisreason protection should be provided. The 90° arc lamp is ideal for stereopticons, thatis currents below, say, 30 amperes. For motion-picture machines, carbons in line hold the arc thebest when 30 or more amperes ar
Handbook for motion picture and stereopticon operators . STEREOPTICON MOTION PICTURE ARC. 64 Motion Picture (in series with the lamp), with an attendant gen-eration of heat in the rheostat. To successfully illuminate a large screen a heavycurrent is necessary and a great deal of heat isgenerated in the lamp, which endangers the filmowing to its inflammable nature, and for thisreason protection should be provided. The 90° arc lamp is ideal for stereopticons, thatis currents below, say, 30 amperes. For motion-picture machines, carbons in line hold the arc thebest when 30 or more amperes are used. The hottest or brightest carbon is the positiveand should be the upper carbon. If this is notthe case, change over the terminals, or throw theswitch over, if the machine is provided with a two-throw pale-changing switch, a safe and convenientarrangement. Heat Shield. A swinging metal shield between the condensersand the film window, operated by a foot treadle,by hand, or automatically from the crank, or both,is the usual method, though a glass tank contain-ing w
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Keywords: ., bookcentury1900, bookdecade1900, booki, booksubjectmotionpictures
