Journal of the Society of Motion Picture Engineers (1930-1949)

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508 O. K. KOLB of the handle, away from the rotating reel of film so that this is evenly and uniformly demagnetized throughout, including all the joints in it. Conclusion The use of magnetic sound in the motion picture studios has only really just begun and the evolution of a new technique to handle it to its best advantage has not yet been fully completed. While there are many instances where photographic stock cannot be used for practices for which magnetic stock can now be employed it is difficult to visualize any development's which will bring magnetic sound actually into the cinemas because of the commercial as well as technical difficulties of replacing photographic sound there. The answer to the question which is often asked as to whether magnetic recording will ever completely replace photographic recording seems to be : No. Rather, does it appear that there will be a happy combination of the two kinds of recording : the magnetic recording in the studios up to the time when the final photographic negative is prepared from which the release prints are made, and the photographic system, as now, in the cinemas themselves. Nevertheless, there may be applications of magnetic sound, tentative as yet, in which it will play an ever increasing part as, for instance, in the preparation of recorded television programs where the fact that the magnetic sound records do not need processing is a great attraction. REFERENCES 1. E. Schiiller, ETZ, Bd. 56 (1935). 2. U.S. patent applications for "Method for magnetic sound recording" filed in the U.S. Patent Office, Oct. 2, 1941; published under Serial No. 413380 on May 18, 1943. 3. Pedersen and Poulsen, U.S. Pat. No. 873083, Dec. 10, 1907. 4. Carlson et al., U.S. Pat. No. 1640881, Aug. 30, 1927. 5. Nature, Aug. 1, 1942, p. 153.