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THREE-DIMENSIONAL MOTION PICTURES to their complementary opposltes. For the first time it is possible to have large designs or plain colored areas that are changeable at will, permanent, and reproduc ible.) Now, if the front Polaroid screen be removed and the observer put on his Polaroid glasses, his left eye sees the screen clearly; the right eye view is dark. If he tilts his head far over to the side, or removes the glasses and holds them vertically, he will see that now the right eye is transparent and the left eye dark. When taking the picture no such material was used. This same device used in front of the projector, or one similar to it, is mounted upon the camera to take two pictures eye-distance apart and place them upon the film side by side. These two pictures are projected again through this device, and upon leaving the device the two eyes are again separated. At this point each eye has a piece of Polaroid placed in front of it. The right one transmits horizontal vibrations and the left one vertical,, exactly as the glasses are arranged. The right eye sees the right-eye picture but not the other. Conversely, the left eye sees the left-eye picture and not that intended for the right eye. The essential condition that each eye see its own picture and only its own picture is achieved. There is nothing to be adjusted mechanically or other wise. The two projectors must run in exact synchronism., so the projector driving units must be interlocked. This can be accomplished either by an electrical interlock using selsyn motors* or by a mechanical interlock. The electrical interlock using the selsyn motor is the most efficient and least likely to give trouble, as a matter of fact it is practically fool-proof. The regular projector motors are used, and these are each coupled to a selsyn motor. The duty of the selsyn, being to keep the two regular motors from