Third Dimension Movies And E X P A N D E D Screen (1953)

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160 THREE-DIMENSIONAL MOTION PICTURES it Indicates that the condition can be corrected by a dif ferent setting of the chain sprocket. Once this setting is found it should always result in proper synchronism each time it is set up. Use straight edges to align chain sprockets and double check the cross shaft sleeve to see that the shaft is not under tension or strain. Tighten all set screws. The two machines are now , mechanically interlocked and extreme caution must be observed to see that both llOllOv Reg Switch Reg Switch motors are energized at the same time with a common switch- Perhaps the easiest way (other ways will be evi dent in different projection rooms) is to parallel the two motors with a DPST switch in the circuit, as shown in the diagram. With this additional switch closed both motors would be operated from the No. 1 switch. When opened