Vitaphone Procesd

Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931. Vitaphone was the last major analog sound-on-disc system and the only one which was widely used and commercially successful. The soundtrack was not printed on the film itself, but issued separately on phonograph records. The discs, recorded at 33? rpm (a speed first used for this system) and typically 16 inches in diameter, would be played on a turntable physically coupled to the projector motor while the film was being projected. Wikipedia