Motion Picture Herald (Apr-Jun 1955)

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An Etficietit, Dependable Power Supply for Your Projection Ares CTIFI There’s a National Rectifier designed to match the requirements of every type and rating of angle trim or coaxial trim projection arc lamp. All are built in single lamp units for flexibility of electrical connection. Poicer output adjustment to the arc, over a tvide range of values ichile the arc is burning, is by means of an external, manually operated hand wheel on the front. Transformer taps are provided to compensate for changes in line voltages from 200 to 250 volts and the complete amperage range. SELENIUM PLATE TYPE... A full metallic, heavy duty equipment for converting three-phase A.C. to D.C. for operating arcs of from 60 to 135 amperes. Models in four capacities, adjustable from 60 to 75 amperes, 70 to 90 amperes, 80 to 110 amperes, and 90 to 135 amperes. Reliable operation in damp climates. Fan ventilated. No warm-up period required. © TUBE TYPE... Six models, for use with high intensity arcs for either three-phase or single-phase operation on 230-volt, 60-cycle power service. Amperage ratings; 40, 50, 60-70, 70-85, 75-90. The housing assures ample draft through the transformer assembly and past the rectifier tubes to maintain low operating temperatures. Distributed by MOTION PICTURE HERALD, JUNE I I. 1955