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VARIOUS APPARATUS 69
machine now in use, and permits either the film or the disk producers to be used at will, simply by pressing the proper push button. A signal light gives adequate notice of the circuit which is set up. Interconnections between physically disassociated groups of equipment are made through a junction box located in a projection room. This method not only facilitates installation but provides a ready means for circuit checking and trouble finding.
While equipment and installation methods are constantly being simplified it may be noted that a rather marked advance in this direction has been made during the past few months. In the beginning, the driving motor and disk turntable were mounted on separate mounting pedestals. The film reproducer and associated amplifier are still supplied as separate units to be assembled as an appendage, and the film disk transfer panel is an apparatus separately mounted on the wall. At present, however, these individual pieces are joined into a single united whole. A pedestal is furnished with sufficient space for placing the driving motor and mounting the disk turntable. The film reproducer and amplifier form a definite part of the pedestal. A film disk transfer switch is associated with each unit that permits the projectionist to make his machines ready for the succeeding selection to prepare completely for the change-over. Equalizers that are necessary are included in the pedestal on special wiring, so that switching of such units is eliminated. A mechanical brake provides ready halting of the projector.
The installation engineer next turns his attention to the stage. The horns are placed in the mountings which have been prepared. They are located in positions which, experience has taught the engineer, may be roughly correct for the particular type of house. When horn installations have to be moved during performances it is decidedly advantageous to place the horns on movable towers or on an