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

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Portable 16mm Arc Projector Adapted for 3-D Projection By J. J. HOEHN, A. J. CARDILE and RALPH A. WOODS A new portable arc projector for 16mm film, consisting of five luggage-type units, and its modification for 3-D projection, is described. JL HE RCA Porto-Arc 16mm Projector is designed to provide sufficient light and audio-power output to handle larger screen sizes and audiences than can be accommodated with projectors using conventional incandescent-lamp light sources. The design was made possible by the development of a dual operating-range 16mm arc lamp and associated rectifiers small and light enough to justify the use of the term "portable." This lamp has been integrated into an overall projector design which allows the equipment to be separated into readily portable units. For example, the arc lamp is easily disconnected from the projector mechanism, and both units merely lift off the pedestal-amplifier assembly to Presented on October 8, 1953, at the Society's Convention at New York by J. J. Hoehn and A. J. Cardile (who read the paper), Radio Corporation of America, RCA Victor Div., Engineering Products Dept., Camden 2, N.J., and Ralph A. Woods, Hopkins & Woods, Martinsville, Ind. (This paper was first received October 7, 1953, and in revised form Dec. 24, 1953.) make sections which can be conveniently handled and transported. Mechanical Design Figure 1 shows the Porto-Arc Projector disassembled for transportation. First on the left is the pedestal-amplifier assembly, which is about the size of a large suitcase of conventional proportions. As is usually the case where a piece of apparatus closely resembles a familiar article of everyday life, the pedestal-amplifier has quickly come to be called, "the suitcase." Out of deference to the Society's Nomenclature Committee we shall refrain from use of the term hereafter in this paper. The second item from the left in Fig. 1 is the portable loudspeaker regularly used with RCA Model 400 16mm Projectors. The third item is the dual-range arc lamp, and next is its associated rectifier for converting a-c line power to the low-voltage direct current required for proper operation of the arc lamp. The fifth and last item is the projector mechanism; reel arms and small accessory items are mounted within its housing. The heav 242 March 1954 Journal of the SMPTE Vol. 62