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OPERATING MANUAL 117
ometer, which is called the "fader." This fader has steps, up to fifteen. Usually a standard fader setting is given at each theatre. A master fader and also a dummy fader are provided with each installation. The master fader has all the electrical connections, and the dummy fader is an extension to an auxiliary operating point in the projection room. The two are coupled by means of a shaft. In order to balance the electrical characteristics of the system it is necessary to have input equalizers and input film attenuators in the system. The input equalizer is mounted underneath the turntable of the Western Electric universal base. The film attenuator is installed near the pick-up amplifier when the universal base is used. It is very easy to balance the volume between disk and film recording. The film attenuator is balanced with the input of the disk. When the universal base is not in use, the film attenuators and the disk equalizers are installed at the top of the amplifier panel rack.
The output of the amplifier system is set up on what is called an "Output control panel." This is where the sound is distributed to the various loudspeaking horns through separate output circuits. The horn switches, amplifier tubes, condensers, resistors, monitors and controls, and transformers are mounted on this panel board. Each horn has a separate control on the panel.
V. Horns
There are four types of horns being used in various theatres at the present time. The 12-A and 13-A horns were used exclusively until the 15-A and 15-B horns were furnished with installations. When you are using the 12-A and 13-A horns, the 12-A horns are usually placed about three-quarter distance up on the screen, to carry the vocal or the instrumental music in such fashion as to give per