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THREE-DIMENSIONAL MOTION PICTURES In shooting the three dimension pictures, a new technique must be used, the sets and placement of the actors must be such as to avoid false perspective and distortion. The "locale of action" for each scene must be kept within certain prescribed bounds to secure the proper stereoscopic effect when the picture is projected. In the projection of the Natural Vision picture, two projectors are used, both running simultaneously. One projector, is threaded with the film made by the left eye camera, while the other projector is threaded with the film made by the right eye camera. Both pictures being superimposed on the theater screen. The pictures must be projected through Polaroid filters, a special filter being necessary for the projector on the left and a special filter for the one on the right. These filters are marked, so that the proper filter can be installed at each projector. These filters are at present being installed in the projection ports in the booth. It is necessary that great care be taken in the installation of these filters, instructions are being shipped with the equipment, and these instructions will have to be closely followed. White light from the projector, should never be projected through these filters, as this will render them useless. A second set of filters should always be kept on hand to be used in case of any trouble. These filters like the glasses worn by the members of the audience are made by the Polaroid Corporation, and are the invention of E. H. Land of Boston. Ordinary light can be said to vibrate in all direc tions at right angles to the direction in which it is travelling. Polaroid is made up of a multitude of sub- microscopic crystals, each having polarizing properties, all lined up perfectly and immovably embedded in a