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THREE-DIMENSIONAL MOTION PICTURES produce serious eyestrain; any Imperfection at all of alignment produces some eyestrain. The porthole filters are installed. Each filter frame consists of an upper bar with rings, and a lower bar with clips. The location of the center of the light beam in the projection port is found, and the upper bar so mounted above the port that the polaroid filter will be centered on the light beam, The upper bar must also be accurately level—for this reason a spirit level Is supplied with the Natural Vision conversion "package." The lower bar need not be levelled. It is installed at a distance below the port that will provide easy clearance for removing the filter. (The filter is removed from the port for cleaning and also whenever a standard, non-stereo show is projected. Cleaning—of both sides of each filter—is done daily with Staticmaster brush.) The filter marked "left" is installed over the left port facing the screen and the one marked "right" over the other; each filter also is marked on either side "toward lens" and "toward screen," and is installed accordingly. The spare filters also are so marked— this is why two spares are needed; they are not inter changeable. The instructions add this warning: NEVER PROJECT WHITE LIGHT THROUGH THESE FIL TERS. YOU WOULD RUIN THEM. RUNNING THE SHOW Following are the exact instructions given for run ning the picture Bwana Devil. This show consists of four 23" reels marked as follows: "Left First Section," "Left Second Section," "Right First Section," and "Right Second Section." Each section runs approximately 50 minutes. Thread reel marked "Left First Section" in left