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i34 SOUND MOTION PICTURES
6. On the 41-A panel turn on the filament-plate switch to read "Filament Key." Adjust by the filament control dial. It is very important to keep the meter reading at 250 at all times; the tubes in the 43-A and 42-A panel are now warming up, and should be allowed to do so for at least five minutes or more before the plate current is turned on. Otherwise there is a risk of injuring them by a flash over.
7. On the 43-A panel turn on the filament-plate switch to read "Plate." The meter should now read between 100 and 150 milliamperes.
8. On the 42-A panel turn on tne filament-plate switch to read "Plate." The meter should now read between 50 and 65.
9. On the 41-A panel press the button. Numbers 1. 2, and 3 should read 1.5 each.
10. Close the A. C. line— "Horn Switch."
11. On the 200-A output panel set the key at "E," which is down position. You can also use the "R" position, since these two are tied together. Note the " R" position is up. You may be in a hurry sometime and hit this key to the "Off" position; therefore, always set the key to "E" position.
12. Turn on the fader key switch to either "Regular" or "Emergency," since these two are tied together. The fader should be to "Off" position.
13. On the 200-A panel turn on the monitor and theatre horns to be used.
14. For disk, use the switching panel. It should read "Disk," as indicated by pilot light.
15. For film, use the switching panel. It should read "Film," indicated by the pilot light. Close the 6-pole switch mounted on front wall. The current should now be flowing through the exciting lamp and meter adjusted to read 3.6 amps.; also the current for the photo-electric cell and amplifier. The meter should be adjusted to read 250 milliamperes.