A New Recorder for Variable Area Recording

Abstract

A recorder embodying certain new principles in its design and operation has recently been adopted by RCA Photophone, Inc. It is designated as Type PR-4. The optical system has been redesigned and a number of improvements made, especially in the direction of providing better facilities for adjustment. The sound record produced is of the variable area type which has been used from the beginning by this company, and which has given excellent results. It is, however, in the means employed for providing uniform movement of the film past the point where the recording is done, that the new recorder differs most radically from its predecessors.

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