Moving Picture News (1911) . FIG. 2 A C Economizer. This apparatus is now so well knownthat I do not think it necessary to waste space in making adescription of it. About three years ago wideawake exhibi-tors felt the need of better illumination on the screen than omizer for changing the alternating current into direct cur-rent, which is illustrated in Fig. 2. This machine is made upof an alternating current motor directly connected to aspecially constructed direct current generator, both mountedon a common sub-case, as illustrated. The alternating cur-rent motor may be wound for any voltage o
Moving Picture News (1911) . FIG. 2 A C Economizer. This apparatus is now so well knownthat I do not think it necessary to waste space in making adescription of it. About three years ago wideawake exhibi-tors felt the need of better illumination on the screen than omizer for changing the alternating current into direct cur-rent, which is illustrated in Fig. 2. This machine is made upof an alternating current motor directly connected to aspecially constructed direct current generator, both mountedon a common sub-case, as illustrated. The alternating cur-rent motor may be wound for any voltage or cycle, either sin-gle phase, two-phase, or three-phase current. The directcurrent then is so constructed that direct current will bedelivered to the arc of the moving picture lamp of just theright quality to produce perfect crater formation. The Hallberg A C to D C Economizer can be made to-operate one or more lamps at the same time and may bemade to deliver anywhere from twenty-five to seventy-fiveamperes to the arc. When
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmotionpictures, booky
