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Third Dimension Movies And E X P A N D E D Screen (1953)

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THREE-DIMENSIONAL MOTION PICTURES 25 amperes continuously, then a generator rated 110/220 amperes will be required Of course these figures only apply providing the generator is in good condition. If your present generator will not carry the necessary load for these new type equipments, then a larger generator will have to be installed, or an additional generator added. Your supply dealer can give you cost. In theaters using rectifiers, it will probably be necessary to replace these with larger rectifiers or a motor gen erator set may be more satisfactory. If a heavy duty continuous rectifier is now being used, then we suggest an additional rectifier be purchased, then these two can be run intermittently, one for the first hour of the show, the other can be used for the second half of the show. One cooling off while the other is in use. A 75-85 Ampere rectifier will cost around $750.00. The two arclamps in the theater booth have in the past been used intermittently, each lamp has been used for a period of say 20 minutes, then given a 20 minute cooling-off period, while the second lamp took over. With the Natural Vision system, and all other systems using viewing glasses, the two arclamps must now burn simultaneously and continuously for a period of approximately 55 minutes. These lamps were not designed nor intended for such usage, and it is just possible that they may not stand up under these new requirements. It would be as well to have your projec tionist or your dealer check over this situation. Then again, arclamps drawing very high amperages are needed with these systems, extra amperage may be required at your arclamps, to help overcome the great loss of screen light entailed because of the use of the polaroid light filters in the booth, and the further apparent loss of screen brightness to the viewer due to the wearing of the polaroid glasses. If the required