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THREE-DIMENSIONAL MOTION PICTURES drifting apart, so that the two remain in step and both run at exactly the same speed, thus keeping the two projected films in exact synchronism. A single switch operates the starting and stopping of the four motors. Because the two projectors are used at one and the same time for the showing of the films, it is impossible to run a continuous show. There must be breaks for rethreading the film and for arclamp retrimming. The film therefore comes on oversize reels measuring 23 inches* and holding some 5,000 feet of film. Thus the show can be run with but one intermission midway during the program. An intermission, will of course, also be required between each complete show. To accom modate these oversized reels a new 24 inch upper and lower film magazine must be installed, and this may mean that the projector will have to be re-located, or built-up, in the booth, to give clearance for the large magazines. The rewinder too, will have to be raised, so as to take the new size reel. Another factor that must be taken into consideration on the installation of any type third dimension film, or for that matter, the expanded screen type also, is the question of screen light. The Polaroid filter, must be placed in front of the projector objective lens with its surface at right angles to the lens. A line drawn through the optical train of the projector, should pass in the exact center of the filters. These filters are of a light-polarizing material. The light from the arc, passes through the optical train of the projector, and leaves the projection lens, unpolar- ized, the light after it passes through these filters is polarized at a 45 degree angle. The filters will only transmit light in the plane or axis of polarization. The plane of polarization for the left hand projector is 45 degrees from the horizontal sloping to the left, while that from the right hand projector, is 45 degrees from