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W. C. MILLER AND H. R. KIMBALL
Vol 43, No. 3
connection with the provision of these new facilities to give greatly improved variable equalization characteristics and control features over our past supply of such networks. Being of a design new to the industry engineering information concerning them is given later on in this paper.
Pre-set Circuit. — Another feature of the console which is proving of great value is' a circuit called a Pre-set Circuit shown diagrammatically in Fig. 7. A large number of the variable equalizers supplied for the console are "normalled" to the pre-set circuit. This circuit as a whole, including its normalled apparatus, may be patched into any one of the patching points shown in Fig. 6. Essentially the pre-set arrangement allows the pre-setting of banks of equalizer
FIG. 7. Pre-set circuit.
equipment for some definite equalization condition and its switching into the console circuit at any desired place in a reel of film. Its use has reduced the mechanical work of the mixer and freed his attention for other things by accomplishing in one movement what might have required several with an accompanying diversion of attention. The switching controls for the circuit to switch from one pre-set condition to another are push buttons appearing on the mixer console near the volume controls. Three pre-set conditions and a normal are provided with each pre-set circuit, and each mixer position has one such circuit. The pre-set buttons for the secondary mixer position are multiplied over to the master position for his use when needed. The equalizers normalled to the pre-set circuits may be patched out and used in other places, if desired, or additional networks may be patched into the pre-set circuits by means of the jacks provided.