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STANDARD SOUND DEVICES 57
electric cell. The reproducing light is obtained from a 50-watt, concentrated-filament Mazda C lamp, located in the projector. This light, passing through the film on which the blackened area is proportional to the sound, effects pulsations of current in the photo-electric cell. The alternating component of this current is then carried to the amplifier. The power is amplified and controlled to the value necessary to operate the loudspeakers, the size of the amplifier depending upon the service required.
Two types of Phonofilm reproducers have been developed. One has an attachment for a Simplex projector inserted between the upper magazine and the projector head. A constant speed motor is substituted for the variable speed mechanism of the standard projector. The other is a complete projector in which sound and picture mechanisms are contained within a single housing.
Another additional piece of equipment which is part of the R. C. A.-Photophone system is a double turntable electric pick-up phonograph by means of which nonsynchronized music can be played during a performance, as an overture between performances, or at any other time. Music from nonsynchronized phonograph records is also amplified by the regular Photophone amplifying system and projected out into the house from the loudspeakers mounted on the stage. This phonograph also has the means whereby an announcing microphone can be cut into the circuit by the throw of the switch by means of which announcements can be made to the audience.
Obviously, the inventor's specialized connection with radio and radio tubes is his point of contact with the industry we are discussing. That he has stamped his name on an added device in a fresh domain is indicative not only of his own resilience but of the growing complex relations, not only in kindred businesses, but in the fields of scientific speculation underlying them.