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MANAGERS AND PROJECTIONISTS 1157
2. Adequate reserve apparatus is provided in the larger equipments, so that the show will go on even in an emergency.
3. All outside power to the amplifiers is furnished by regular 110-volt, 60-cycle alternating current lighting supply.
4. All high voltage is completely enclosed within the amplifier, and the amplifier itself is enclosed in a metal case.
5. The Type "D" installation can be converted into the Type "C installation in a very short time, by the addition of one voltage amplifier unit and one power amplifier unit with proper inter-connecting cables.
INPUT CONTROL PANEL.— Fig. 419 affords us a view of the RCA Photophone input control panel. A indicates the knob by means of which the volume of sound is controlled. It will be observed that there are twenty-six (26) steps, each one of which means a difference in sound volume.
In the upper right hand corner we see three small lamps, one of which is white, one red and one green. These are for use by an "observer" located in the auditorium during the cueing of a production, or at other times if desired. When the top, or red lamp flashes, it means increase volume one point. If another point then is desired, the lamp flashes again. Or the light may be held on until the desired volume increase has been reached, which is accomplished by advancing the knob A pointer a step at a time. Or it may be arranged that when the red flashes, the volume is to be slowly advanced until the white (center) lamp is flashed, which means "hold position. " The lower or green lamp flashing means lower volume. It is an excellent arrangement.