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. Associate Editors G. L. CHANIER P. MOLE S. E. SHEPPARD O. M. GLUNT W. B. RAYTON J. L. SPENCE A. C. HARDY P. E. SABINB I/. T. TROLAND Volume XIV APRIL, 1930 Number 4 CONTENTS Page Dimensional Analysis as an Aid to Miniature Cinematography G. F. HUTCHINS 377 Flexible Drive Shafts — Their Application to Sound Pictures . . J. C. SMACK 384 A Quick Test for Determining the Degree of Exhaustion of Developers .... MERLE L. DUNDON, G. H. BROWN, AND J. G. CAPSTAFF 389 Elimination of Commutator Ripple from Direct Current Generators .... O. K. BUCK AND J. C. ALBERT 399 Radiation Characteristics of Two Mercury Arcs FRANK BENFORD 404 A Method of Testing for the Presence of Sodium Thiosulfate in Motion Picture Films J. I. CRABTREE AND J. F. Ross 419 A New Sixteen Millimeter Motion Picture Camera . . JOSEPH A. DUBRAY 427 The Academy of Motion Picture Arts and Sciences and Its Service as a Forum for the Industry FRANK WOODS 436 Theater Lighting 441 Report of Projection Committee 444 Abstracts 450 Officers 453 Committees 454 Committee Chairmen 457 New Members 459 Change of Address 459 Society Notes 460 Pacific Coast Section 464 Report of the Secretary 466 Spring Meeting of the Society, Washington, D. C 468 Information for Authors concerning Publication in the JOURNAL 471 Published Monthly by the SOCIETY OF MOTION PICTURE ENGINEERS 20th & Northampton Sts., Easton, Pa. Editorial Office: 343 State St., Rochester, N. Y.