Projection engineering (Jan 1932-Mar 1933)

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Projection Engineering Sound Pictures Visual Projection Sound Recording Audio Amplifiers Public-Address Systems Photography Facsimile Recording Television Photo-Voltaic Cells Circuit Measurements Automatic Music Acoustic Engineering Radiant Energy Devices Electric Recording Phototubes Home Talkies Theatre Engineering Amplifier Tubes Sound Reproducers Screen Engineering Electric Power for Projection Recording Studio Engineering Location Sound Equipment Rectifier Tubes Industrial Tube Applications Donald McNicol Editor Jas. R. Cameron Associate Editor Ulmer G. Turner Western Editor F. Walen Managing Editor Vol. IV APRIL 1932 Number 1 Contents PAGE 4 Editorial Screens for Sound Pictures By Gordon S. Mitchell 7 The Microphone in Public-Address Systems By Charles Felstead 9 The Screen Problem . , By Sylvan Harris 1 3 A Re-Recording Machine for Sound Films By J. J. Kuhn 14 Sound Picture Lectures Expansion 17 Sound Transmission for the Hard of Hearing By Henry L. Williams 1 8 Thermionic Switchboard Controls Theatre Light 20 Educational and Commercial Films with Sound-on-Disc By Roger W. Fenimore 21 World's Largest Public-Address and Program Distributing System By J. J. Kuhn 22 Departments New Developments of the Month and News of the Industry 24 Index of Advertisers 30 Bryan S. Davis President James A. Walker Secretary Published Monthly by Bryan Davis Publishing Co., Inc. 19 East 42nd Street New York City E. M. Bacon Advertising Manager J. E. Nielson Circulation Manager Chicago Office— 333 N. Michigan Ave.— Charles H. Farrell, Mgr. St. Louis Office505 Star Bldg.— F. J. Wright. Kansas City Office— 306 Coca Cola Bldg.— R. W. Mitchell San Francisco Office— 155 Sansome St.— R. J. Birch. Los Angeles Office— 846 S. Broadway— R. J. Birch. New Zealand— Tearo Book Depot— Wellington. Australia— McGill's Agency— Melbourne. Entered as second class matter August 15, 1931, at the post office at New York, N. Y„ under Act of March 3, 1879. Yearly subscription rate $2.00 in U. S. Yearly subscription rate $3.00 in Canada and foreign countries.