Reversible synchronous rerecording system

Claim 1

IN A SYSTEM FOR MAINTAINING THE OPTIMUM INTERLOCKING SYNCHRONOUS FREQUENCY BETWEEN ANY COMBINATION OF A PLURALITY OF SOUND REPRODUCING MACHINES, AT LEAST ONE RECORDING MACHINE, AND AT LEAST ONE MOTION PICTURE PROJECTOR, SAID MACHINES AND PROJECTORS HAVING LOAD MOTORS, A DISTRIBUTOR, AND A SYNCHRONOUS DRIVE MOTOR FOR SAID DISTRIBUTER, EACH OF SAID LOAD MOTORS AND SAID DISTRIBUTOR HAVING STATOR AND ROTOR WINDINGS, SAID DRIVE MOTOR, SAID DISTRIBUTOR, AND SAID LOAD MOTORS BEING ADAPTED TO BE CONNECTED TO A THREE-PHASE POWER SOURCE, MEANS FOR CONNECTING SAID LOAD MOTORS, SAID THREE-PHASE SOURCE TO DRIVE SAID MOTORS IN A CERTAIN DIRECTION, THE FREQUENCY OF SAID THREEPHASE SOURCE PROVIDING THE OPTIMUM FREQUENCY OF THE INTERLOCKING CURRENT BETWEEN SAID LOAD MOTORS AND SAID DISTRIBUTOR, AND MEANS FOR DRIVING SAID LOAD MOTORS IN THE REVERSE DIRECTION WITH THE SAME FREQUENCY AS THE INTERLOCKING FREQUENCY OF THE CURRENT BETWEEN SAID LOAD MOTORS AND SAID DISTRIBUTOR, SAID INTERLOCKING CURRENT BEING OBTAINED BY REVERSING ONE PHASE OF SAID DRIVE MOTOR, DISTRIBUTOR, AND SAID LOAD MOTORS.