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OPERATING MANUAL 131
from the horns may be too low or the audition may be poor. Since the vibration of the projector tends to jar the lamps and to cause it to change its position, go over this adjustment every day.
Dust on the lamp and lenses, dirt clogging the openings in the aperture plate and tension pad, or dirt on the film, will also cause insufficient illumination. The film must, therefore, be kept in first-class condition, and the other parts mentioned must be cleaned every day.
After cleaning, as just mentioned, proceed as follows:
1. Close the film pick-up switch mounted on the front wall of the projection room.
2. Put the lamp in the socket and light it by turning the control on the door of the compartment. Adjust the control so that the meter reads 3.6 amperes.
3. Loosen the lamp-socket clamping screw and turn the lamp till the filament is perpendicular to the axis of the lens tube. Then, keeping this adjustment, move the lamp up or down until the filament image is centred vertically on the slit in the lens tube as observed through the window inside of the tube. Tighten the clamping screw.
4. Loosen the screw which clamps the lamp socket holder and the regular distance of the lamp from the lens tube by moving the socket holder endwise until the sharpest possible focus is obtained on the slit. This will also give the brightest illumination on the slit. Tighten the clamping screw.
5. Make a sidewise adjustment of the lamp by releasing the side adjustment clamping screw and turning the side-adjustment knob until the filament image is centred horizontally on the slit. In making this adjustment, when trying to move the bracket away from you, it is necessary to press steadily on the knob at the same time that you turn it, otherwise the bracket will not move. After adjusting, tighten the clamping screw.
6. If making one of these adjustments upsets a previous