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THREE-DIMENSIONAL MOTION PICTURES The gear boxes should be mounted on the SH-2838 angle brackets using the A-3QO Screws and A-540 wash ers. The brackets are then mounted on the soundheads using PS-1438 Screws and CS-1236 washers. The SH- 2839 Gear Box mounts on the left (facing screen) on No. 1 soundhead, and the SH-2840 on the No. 2. The universal joint on each shaft assembly is stamped to indicate which gear box shaft it is to be pinned to, the number one shaft assembly has a No. 1 stamped on the coupling and the shaft on the No. 1 gear box is also stamped- In all cases the number will appear adjacent to the larger diameter of the tapered hole. If the difference between the projector lens cen ters is between 5' 8" nd 6' the standard size cross shafts will be ready for use. For shorter distance an equal amount should be removed from each shaft and the cross shaft sleeve tightened in place only after the gear boxes and bases are in their final positions, as it is very important that the cross shaft is not under tension or strain. It will be necessary to saw or file off a portion of the SH-7032 guard assembly to provide clearance for the chain which drives the gear box. Removal of ap proximately one-half inch from the bottom of the cast ing should be sufficient. TO PROVIDE SYNC THROUGH INTERLOCK To provide a convenient means of adjusting and checking for synchronous operation as well as a thread ing aid to prevent loss of synchronism when threading the mechanics, a number of sync indicator decals are supplied. Each machine is turned in normal direction by hand, until the intermittent sprocket moves down ex actly two teeth (the intermittent has completed one-