Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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Fig. 1. The RCA Porto-Arc 16mm Projector is complete in five cases. iest items are the pedestal-amplifier and the rectifier, which weigh about 60 Ib each due to the inevitable weight associated with transformers of adequate performance characteristics. Figure 2 shows the Porto-Arc Projector set up and operating. The projector mechanism and the arc lamp lock firmly together in correct optical alignment by means of guide pins, locating holes, and an aircraft-type cowl fastener. This feature was considered to be essential in a machine intended not only for portable service and professional projection, but also for operation by relatively inexperienced personnel. The assembled mechanism and lamp rest on the upper surface of the pedestalamplifier case as shown, supported by the rear arc-lamp feet and by the movable front pins of the tilting device incorporated in the case. The pedestal legs are splayed a considerable degree laterally and longitudinally to provide excellent mechanical stability for the complete projector. The pedestal-amplifier assembly has separate compartments to contain its demountable legs and the interconnecting cables, and it also incorporates the 5° tilting mechanism in the front operated by a fold-in crank. Adjustable legs accommodate the projector optical axis to existing projection room portholes and "up" or "down" projection angles. All interconnecting cables are provided with suitable plug connectors of a variety of types to prevent incorrect connections. In other words, if the plug on a cable end fits a given socket, it is the right plug for that socket. Amplifier Figure 3 is an interior view of the pedestal-amplifier case with the control panel removed to show the amplifier chassis. The amplifier incorporates Fig. 2. RCA Porto-Arc set up in operating position. Hoehn, Cardile and Woods: 16mm Projector for 3-D 243