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THREE-DIMENSIONAL MOTION PICTURES 1? present-day booth supply costs, such as carbons, light, etc., will be six times as much. To the writer* Cinerama will be forced to place its equipment io large presentation houses in the larger cities through out the country, probably one installation in each city. Fox's CinemaScope is a modified Cinerama process, using only one projector in the regular booth for showing the pictures. The extra width of the screen picture^ is obtained by the use of a special imported expanding lens which is introduced into the optical circuit 011 the projector. CinemaScope, like Cinerama, uses stereophonic sound (directional sound). This type of sound repro duction is necessary to help in creating the depth illu sion, on the screen. The employment of CinemaScope will call for two operators, like the third-dimension systems. While only one projector is used at a time, an extra projectionist will be required in the booth to operate the sound controls, to obtain sound per spective. The installation of third-dimension systems like Natural Vision will call for two projection machines to run simultaneously. Thus it will be necessary to have an intermission midway in the show, to allow the projectionists time to thread up the film for the second half of the program, and also to retrim his arc lamps, as these will now have to burn continuously for a period of approximately one hour. Extra-sized reels are used, allowing for the entire show being placed on two reels. Another intermission will be necessary between each show. The introduction of a polaxoid filter into the optical train of the projector means a 50*# to 60% loss of light on the screen, a further loss of light will be noticed by wearing of the viewing glasses. To overcome this light loss, it may be found necessary