Projection Apparatus (1917)

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Bausch & Lomb Optical Company mirror, which directs the light into the lantern slide section of the lower Balopticon, is controlled by the exterior lever, shown on top of the dark chamber (Figure 10). In order to change from one kind of projection to the other it is only necessary to shift this mirror, thus directing the beam of light either through the moving picture projection lens or over into the lantern slide section of the lower Balopticon, as desired. Another feature of these outfits lies in the fact that separate condensing systems are supplied for lantern slides and for moving pictures, suitable for their respective projection lenses. Because of this feature maximum efficiency is attained in both kinds of work. Any of the standard moving picture mechanisms (Edison, Powers or Simplex) are supplied with this outfit. All are fitted with the regular Bausch & Lomb projection lenses, which are of the highest quality. Both Balopticons are equipped with light-tight lamp houses with special ventilating device. We provide four strong legs, adjustable for height, which attach to the corners of the baseboard, giving a substantial stand to be raised, lowered or tilted as desired. & We recommend with any of these outfits one of our adjustable rheostats for 15 to 25 amperes and one from 15 to 35 amperes, to be selected according to voltage available. 37