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58 SOUND MOTION PICTURES
V. Bristolphone
The Bristolphone is a phonographic type device with the sound recorded on the disk. It is produced by the William H. Bristol Manufacturing Company. The apparatus consists of a turntable connected to the projector. It is claimed for this machine that the sound can be started and stopped without getting out of synchronization with the motion picture, by simply turning a device attached to the machine, which will immediately resynchronize. This is an advantage if the film should break and throw the sound out of synchronization. The amplifying device consists of an amplifying unit similar to that used at large radio stations, with a horn set back of the screen. The apparatus uses a double turntable device, which can be hooked up to the same amplifying unit, on which records can be played — in sufficient volume to fill an average-sized theatre.
This synchronizing system consists of two special synchronizers, one of which generates the electrical energy in its magnetic field to feed the field of the other. The armatures of both synchronizers are energized from an alternating current line. When the armature of one of the synchronizers is turned by an outside source of power, the armature of the other synchronizer turns the same amount and at the same speed, transmitting power electrically from one synchronizer to the other, with synchronism at any speed. These synchronizers are attached to the projector by a five-wire cable. A motor beneath the turntable drives the turntable through the worm and gear and also drives the armature of the turntable synchronizer, which in turn drives the armature of the projector synchronizer, so that the projector is furnished with power for its operation. Synchronization of the film with the record on the turntable is thus maintained.
From the description and illustration it may be seen that