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STANDARD SOUND DEVICES 53
ble for the owner of Photophone projection equipment to take advantage of all synchronized sound pictures with disk attachments now being offered in the market. The music or sound effect contained on the disk is amplified through the regular Photophone amplifying equipment and projected into the house in the same manner as synchronized sound film.
Standard Photophone equipment has been designed to operate on 115 volts, direct current; on 220 volts, 3-phase alternating current; and on no volts, single-phase alternating current. Where direct current only is available as a source of power supply and also in the case of Classes A and B equipment, a four-unit motor generator will be required in addition to the standard equipment for projection purposes. The motor generator can be mounted either in the basement or in some part of the building where any noise made by it will not be heard in the auditorium. It can then be connected to the projection system by means of cables run through conduits. Equipment of Classes C and D does not require a motor generator provided 22 volts, 3-phase alternating current, and also no volts, singlephase alternating current, is available.
The motor generators referred to are used for the purpose of furnishing voltage for the large tubes in the amplifier section of the projection equipment and are not to be confused with the power supply for the arc for projecting the picture part of the film. As mentioned previously in this explanation, the light chamber and the lens now in use in any motion picture theatre are retained in service and are merely transferred to the new projectors which are furnished as a part of Photophone equipment.
R. C. A. also produces a small disk-type machine for use in theatres with a seating capacity up to 600 seats. It has been designed specifically and exclusively for this type of theatre. The same organization, in addition, makes four