Abstract
The evolution of the modern high fidelity recorder, from the relatively crude apparatus first used for recording when sound was added to the picture, is traced; beginning with the telegraphic recording device known as the pallophoto-phone developed by C.A. Hoxie, passing through the phonofilm devised by L. de Forest, and continuing through the RCA PR-1 and PR-3 to the up-to-date PR-4 variable width recorder embodying the latest developments for maintaining a high constancy of speed and for producing recordings of the highest quality. The paper describes the new model recorder and film phonograph, and the application of these to dubbing and re-recording, both on 35-mm. and 16-mm. film.
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