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MANAGERS AND PROJECTIONISTS 1123
increases the volume of sound. Moving it to lower numbers of course decreases it. When the fader pointer ib at zero there is no sound at all.
Always keep the pointer on one of the numbers,
never between two of them. If it be between two numbers, then the contact shoe will rest on two contact buttons and there may be arcing, which will set up noise at the horns.
Either the red or the white side of the fader may be cut out of the circuit by throwing the switch marked "fader", located at the top of the fader casing to the side marked with the color in question.
FADER CAUTION.— Should it be found that after having started projection there is either no sound at all, or very poor sound, and investigation discloses the fact that you have (a) failed to light the exciting lamp or (b) close the sound gate, do not either light the exciting lamp or close the sound gate until you have first retarded the fader to zero. If you neglect to retard the fader to zero before closing the sound gate or lighting the exciting lamp, you may expect a blast of sound from the horns which will be altogether unpleasant.
When you have retarded the fader to zero and remedied the fault, then do not swing the fader quickly up to regular operating position, but advance it gradually.
The fader must always be at zero when projection
starts, and only advanced gradually to regular operating position when the projector has attained normal speed.
Note: By "gradual" it is not meant that the action be excessively slow. You will very quickly come to understand how fast it may be advanced without causing