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

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JOURNAL OF THE SOCIETY OF MOTION PICTURE ENGINEERS LOYD A. JONES, EDITOR pro tern. Volume XIV MAY, 1930 Number 5 CONTENTS Page Some Properties of Chrome Alum Stop Baths and Fixing Baths (Part I) J. I. CRABTREE AND H. D. RUSSELI, 483 Sound Films for Surgical Instruction P. E. TRUESDALE 513 Some Aspects of a Western Electric Sound Recording System . S. S. A. WATKINS AND C. H. FETTER 520 Measuring the Effective Illumination of Photographic Objectives J. HRDLICKA 531 Camera Mechanism, Ancient and Modern ARTHUR S. NEWMAN 534 Standards Adopted by the Society of Motion Picture Engineers 545 Abstracts 567 Book Reviews 571 Officers 572 Committees 573 Annual Report of the Treasurer 578 London Section 579 New York Section 580 News Note from the National Society for the Prevention of Blindness 581 Society Notes 582 List of Membership 585