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15U THREE-DIMENSIONAL MOTION PICTURES machine facing screen. Thread reel marked ""Right First Section'"' in right-hand machine facing screen. Be absolutely positive that start marks are threaded the same on both projectors as a difference of one frame between projectors is noticeable and results in eyestrain to the viewers. Focusing before the show starts is done without wearing polaroid glasses. For proper focusing start both projectors, open left machine light and focus same. When sharp focus is obtained douse this light, open light on right machine and focus. Mark the posi tion of each adjustment. Whenever regular pictures are to be shown remove the filter and re-focus. Mark this focus adjustment position also. During Operation. The credit titles of Bwana Devil afford an excellent opportunity for checking horizontal lineup and focus. To check horizontal lineup do not wear glasses. Both titles should be superimposed. If titles are not in proper alignment use framing handle on one projector only. To check focus wear glasses. Cover left eye. Check focus on right machine. Then cover right eye and check focus on left machine. Film Break. In the event of a break in the film, stop the projectors immediately and proceed as follows: If your print has footage numbers,, use a china marker to give you start frames on the same number on both projectors. In the event your print has no footage numbers, pull down to first frame of next scene on both projectors. Use this first frame as start mark. Mark starting frames "Top" and "Bottom" to avoid any chance of misframe •on starting. When patching Bwana Devil film, if it becomes