DeForest Achievements (c. 1920s)

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THE PHONOFILM (Photographs courtesy of the Forum Theatre, New York City) The center picture gives a full view of DeForest Phonofilm and Phonodisc in- stalled in a theatre—the sound box is enclosed in the white circle, and the double channel panel board shows to the left. At the top is a detailed view of the double exciting lamp arrangement. At the bottom is a top view of the sound box, showing the gears, and inside the box the "spinwheel” an exclusive DeForest feature.