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June, 1939]
HIGHLIGHTS OF SPRING CONVENTION
685
Recording;" J. G. Frayne and R. R. Scoville, Electrical Research Products, Inc., Hollywood, Calif. "A New Film Playback;" D. G. Jones, Hollywood, Calif.
WEDNESDAY, APRIL 19TH
Sound Session; J. O. Aalberg, Chairman.
10:00 a.m. "A Sound-Track Projection Microscope;" G. M. Best, Warner Bros.-First National Studios, Burbank, Calif.
"Controlled Sound Reflection in Review Rooms and Theaters;" C. M. Mugler, Acoustical Engineering Co , Los Angeles, Calif.
"Acoustic Condition Factors;" M. Rettinger, RCA Manufacturing Co., Hollywood, Calif.
"Push-Pull Audio Transformer Design for Minimum Amplifier Distortion and Intermodulation;" B. F. Miller, Warner Bros.-First National Studios, Burbank, Calif.
"Use of an A.-C. Polarized Photoelectric Cell for Light Valve Bias Current Determination;" C. R. Daily, Paramount Productions, Hollywood, Calif.
"A Densitometric Method of Checking the Quality of VariableArea Prints;" C. R. Daily and I. M. Chambers, Paramount Productions, Hollywood Calif.
"A New Mobile Film Recording System;" B. Kreuzer, RCA Manufacturing Co., Los Angeles, Calif., and C. L. Lootens, Republic Productions, Inc., North Hollywood, Calif.
Open afternoon.
Sound Session; R. M. Townsend, Chairman.
8:00 p.m. "A Direct Positive System of Sound Recording;" G. L. Dimmick, RCA Manufacturing Co., Camden, N. J., and A. C. Blaney, RCA Manufacturing Co., Hollywood, Calif.
"A Newly Designed Sound Motion Picture Reproducing Equipment;" J. S. Pesce, RCA Manufacturing Co., Camden, N. J.
"Class A-B Push-Pull Recording System;" C. H. Cartwright and W. S. Thompson, RCA Manufacturing Co., Hollywood, Calif.
"Report on Recent Activities of the Research Council Committee on Standardization of Theater Sound Projection Equipment Characteristics;" J. K. Hilliard, Chairman.
"Modern Instantaneous Recording and Its Reproduction Technic;" N. B. Neeley and W. V. Stancil, Norman B. Neeley Enterprises, Hollywood, Calif.
THURSDAY, APRIL 20TH
Photographic and Laboratory Session; D. E. Hyndman, Chairman. 10:00 a.m. "A Direct-Reading Photoelectric Densitometer;" D. R. White,
DuPont Film Manufacturing Corp., Parlin, N. J. "An Instrument for the Absolute Measurement of the Graininess
of Photographic Emulsions;" A. Goetz, W. O. Gould, and A.
Dember, California Institute of Technology, Pasadena, Calif.