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which has earned for it the deserved reputation of being the best sound equipment from every angle. The Junior DeForest Phonofilm is identical in design and per- formance with the standard model. For houses of 750 seating capacity, or less, it will maintain a prestige for natural reproduction of sound that will be reflected in the box-office every week in the year. TD)FIONODISC, for reproducing sound recorded on discs, is a worthy associate of Phonofilm. In simplicity of operation, sturdiness of construction, and quality of reproduction it ranks with Phonofilm. Its design and distinctive features are developments of the engi- neering staffs of General Talking Pictures Corporation and of British Talking Pictures Corporation. It was selected as the attachment for handling sound-on-disc productions in association with the Phonofilm reproducing equipment only after it had been tested against numerous other sound-on-disc devices in every country in the world. It is easy to build a disc device that will sound good in a demon- stration room, where it is used only occasionally. But a disc device to stand up under the continual running to which it is necessarily subjected in a theatre, must have correct mechanical construction, and sufficient sturdiness to offset the tendency to vibration which is always present. Phonodisc is so constructed that it will operate as steadily and as efficiently ten years after its installation as it does the day the engineers of General Talking Pictures Corporation turn it over to the theatre for operation. The Junior Phonodisc has all the quality of the standard model. For theatres of 750 seating capacity, or less, it will give a new quality to any disc productions that have been made. r TP FIE Phonofilm method of sound reproduction from recordings on film is simplicity itself. Much of the difficulty which is experienced in theatres has come from a belief that there is something vastly com- plicated about the way sufficient sound to fill a theatre is obtained from a very narrow strip of film. As is well known all sound is caused by vibrations of the air. In recording sound motion pictures either on disc or on film a microphone is used to collect these sound vibrations. The microphone translates the sound vibrations into electric waves which fluctuate in exactly the same way as the sound vibrations. In recording on disc these electrical vibrations go into a "cutting head,” where the electrical impulses actu- ate a sharp steel needle which records the vibrations on a wax disc. This wax disc is afterward processed to reproduce the hard discs as are used in the theatre.