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MOTION PICTURE PROJECTION 695
The machines are clamped to a pair of wooden skids, which form a foundation for the boxing. The machine should if possible be left attached to these skids until it has been conveyed to the location which it is finally to occupy. It is perf erable that all wiring should be done before the boxing is removed from the machine, as the boxing will be effective in keeping the machine clean.
As soon as the machine is unboxed, the name plate should be inspected to see that the volts, cycles and phases marked on the name plate of the motor agree with those of the circuit on which the machine is to be used. The name of the generator marking also indicates the volts and amperes which the generator is designed to deliver, and the rating should agree with that specified on the order. It should be remembered that the direct-current arc for motion picture projection requires less current than the alternating-current arc, 25 to 35 amperes at 55 volts being usual for the D. C. arc, corresponding to 40 to 60 amperes at 35 volts for the alternating-current arc.
The A. C. to D. C. Compensarc should be run only on circuits where the variation of either frequency or voltage from normal does not exceed five per cent. Where both frequency and voltage vary, the sum of the variation must not exceed eight per cent.
If for any reason the generator or motor must be taken from the base in order to install the compensarc, great care should be exercised that the machines are properly lined to give a uniform air gap when the compensarc is reassembled. If this is not done, trouble will occur due to the set being