British Kinematography (1953)

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July, 1953 2\ TECHNICAL ABSTRACTS MANUFACTURE OF MAGNETIC RECORDING MATERIALS Schmidt, E., and Franck, E. W. J. Soc, Mot. Pic. & Tel. Eng., 60, 453, 1953. This paper describes in a general way the basic techniques employed in the manufacture of magnetic recording materials. Quarter-inch tape is first discussed, then full-width magnetic tape and striping. Last is a brief prognostication of coming trends. Authors' Abstract. MAGNETIC STRIPING TECHNIQUES AND CHARACTERISTICS Kaspin, B. L., Roberts, A., Jun., Robbins, H., and Powers, R. L. Ibid., 470. This paper describes the progress made at the Bell & Howell Co., sirce 1947 in the development of a magnetic sound track for motion picture film : methods of sound track application ; compositions tested ; testing procedures ; chemical, mechanical, and electrical results obtained ; and standards adopted. Authors' Abstract. MAGNETIC STRIPING OF PHOTOGRAPHIC FILM BY THE LAMINATING PROCESS Persoon, A. H. Ibid., 485. This paper describes a new method of magnetic striping of photographic film using a combination laminating and transfer process. The stripe is transferred from a temporary backing to a photographic film by using heat and pressure to laminate a magnetic tape, face side down, on the film, and removing the backing. The magnetic stripe which remains adhered to the film is very uniform and smooth. This method of striping has the advantages of requiring a minimum amount of space, ease of operation, no solvent hazards, and the uniformity of the stripe can be more easily controlled. Author's Abstract. MAGNETIC SOUND TRACKS FOR PROCESSED 16mm. MOTION PICTURE FILM Dedell, T. R. Ibid., 491. The procedure developed at Eastman Kodak Co. for applying magnetic sound tracks to processed 16mm. motion picture film is fully described. Complete details are given for the coating composition, the dispersing technique and the method of coating. The bead coating method is used. Problems related to coating on film are discussed. Sound-quality measurements are reported comparing these coatings with commercial quarter-inch tape. Author's Abstract. NOTES ON WEAR OF MAGNETIC HEADS del Valle, G. A., and Ferber, L. W. Ibid., 501. Since physical pressure (under contact) is essential between a magnetic head and magnetic media to provide high-quality sound, it is of extreme importance to determine the operating life of the head. This paper describes the methods used and the results obtained in establishing the wearability of the record-reproduce heads on RCA magnetic projectors. Authors' Abstract. A STUDY OF DROPOUTS IN MAGNETIC FILM Franck, E. W. Ibid., 507. Recording and playback losses caused by coating imperfections are evaluated quantitatively. A new technique is described, called " Micropolishing," which physically removes the mound or " nodule " type of imperfection. Author's Abstract. METHODS OF MEASURING SURFACE INDUCTION OF MAGNETIC TAPE Bick, J. D. Ibid., 516. Of various indirect methods of determining surface induction, two are the subject of this discussion. Called the short-gap and the long-gap methods, they can be employed with any suitable magnetic recorder in the field. Author's Abstract. STANDARDIZATION NEEDS FOR 16mm. MAGNETIC SOUND D'Arcy, E. W. Ibid., 526. Industry requirements for 16mm. magnetic sound standards are outlined with respect to universal reproducibility, and test film needs for equipment manufacture and maintenance are described. Author's Abstract. Part IT of the April, 1953, issue of the Journal of the Society of Motion Picture and Television Engineers, containing the symposium on magnetic striping of film, is available for loan from the Society's Library.