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i32 SOUND MOTION PICTURES
adjustment, go back and make the latter again. When all the adjustments are correctly made the filament image will be bright and sharp and perfectly centred on the slit. 7. Turn the control on the film amplifier until the meter pointer is at the middle of the red mark.
After an exciting lamp has been used considerably, the filament may show a tendency to sag. This has a bad effect on the volume, since the filament image no longer coincides with the slit. Another result of aging that tends to cut down the volume is blackening of the lamp bulb, which reduces the amount of light omitted. Therefore, as soon as the filament begins to sag noticeably, or the glass begins to darken, replace the lamp.
On account of the number of operations involved in adjusting the exciting lamp and the possibility that one may have to be replaced during a show, it is necessary to have some means of putting in a new lamp and operating it at a moment's notice. This can be done by setting up in the attachment each spare lamp and bracket supplied, and making all bracket adjustments needed for proper operation. As already explained, the bracket can be slipped bodily off* the supporting pins without disturbing any adjustments. The spare lamp and the bracket can, therefore, be removed and stored away ready for immediate use. If possible, keep the lamp in the bracket; otherwise mark each to facilitate identification.
B. Main Amplifier Equipment When the 41-A, 42-A, or 43-A amplifiers are installed proceed as follows:
1. See that starting switches on the 42-A and 43-A amplifiers are turned off and that the horn safety switch is off. If you are starting up during a show