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

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JOURNAL = OF THE SOCIETY OF MOTION PICTURE ENGINEERS SYLVAN HARRIS, EDITOR Volume XVI JANUARY, 1931 Number 1 CONTENTS Page Condenser and Carbon Microphones — Their Construction and Use W. C. JONES 3 Microphone Concentrators in Picture Production CARL DREHER 23 Tests of Motion Picture Screens WILLIAM F. LITTLE 31 Dubbing and Its Relation to Sound Picture Production GEORGE LEWIN 38 Three Color Sub tractive Cinematography P. D. BREWSTER AND PALMER MILLER 49 Double Toning of Motion Picture Films J. I. CRABTREE AND W. MARSH 57 Some Causes for Variations in the Light and Steadiness of High Intensity Carbons D. B. JOY AND A. C. DOWNES 61 An Estimate of the Present Status and Future Development of the Home Talkies J. B. CARRIGAN AND RUSSELL C. HOLSLAG 67 Methods of Securing a Large Screen Picture 80 Report of Secretary 86 Committee Reports 90 Abstracts 114 Patent Abstracts 117 Officers 120 Committees 121 Contributors to This Issue 123 Society Notes 125