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 JUNE, 1930 Number 6 CONTENTS Page Loudspeakers and Theater Sound Reproduction Louis M ALTER 611 Apparatus Developed to Simplify Manufacture of Lens Wheels for Continuous Projectors ARTHUR J. HOLMAN 623 The Photographic Treatment of Variable Area Sound Films J. A. MAURER 636 The Aperture Effect ELLSWORTH D. COOK 650 Curved Gates in Optical Printers WILLIAM S. VAUGHN AND FORDYCE TUTTLE 663 Some Properties of Chrome Alum Stop Baths and Fixing Baths (Part II) J. 1. CRABTREE AND H. D. RUSSELL 667 Abstracts 701 Officers 707 Committees 708 London Section 711 Meeting of the International Congress 711 Society Notes 712