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152 SOUND MOTION PICTURES
circuit. These batteries function as a filter; that is, to smooth out the supply, across the generator circuit and not as a main source of energy.
A signal system is installed in the projection room and is connected with the signalling stations in the auditorium, so that the observer may increase or decrease the volume as he wishes.
There are twelve loudspeakers furnished with R. C. A. equipment. They are installed in groups of two and are so arranged in each theatre — on the stage, alongside the screen — to give the best results. Cone type speakers are used to give the highest quality of tone value. Troubles in loudspeakers may be located on the loudspeaker sectionalizing panel, located at the bottom of either amplifier. One switch marked "Amp. No. i" and "Amp. No. 2" is used in changing the connection of the loudspeakers from one amplifier to the other.
Another switch, marked "Cones/' in the signal output circuit closes this circuit when turned on, and opens the circuit and places a "dummy" resistance in place of the loudspeaker cones resistance when thrown off". This also enables the projectionist to use the monitor for checking the amplifier output without using the main loudspeakers.
XIV. Operation of R. C. A.-Photophone Sound Projector System
Before operation, the following equipment should be in the proper location as stated below:
NUMBER MATERIAL LOCATION
1 UX-841 Radiotron Second socket in the voltage
amplification section of the amplifier
2 UX-210 Radiotron First and third sockets in the
voltage amplification section of the amplifier