Projection engineering (Jan 1932-Mar 1933)

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Projection Engineering Member, Audit Bureau of Circulations Donald McNicol Editor Jas. R. Cameron Associate Editor Ulmer G. Turner Western Editor F. Walen Managing Editor 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 Vol. IV FEBRUARY 1932 Number 2 Contents Editorial Internationalizing Talking Pictures. By Dr. Alfred Cradenivitz Causes of Film Mutilation By Sylvan Harris The Output Stage in Sound Transmission. By Gilbert Smiley Voice Training on a Scientific Basis Types of Sound Records By Charles Felstead PAGE 4 9 14 15 Commercial 1 6 MM. Sound-On-Film 17 The Buttonhole Microphone By W. C. Jones 1 9 Talking Picture Productions for College Alumni. ... 20 Standards for Electrical Reproduction and Recording of Sound 22 Fader Attenuation Circuits for Public Address and Recording By W. S. Parsons 24 Departments New Developments and News of the Industry 26 Index of Advertisers 30 Bryan S. Davis President James A. Walker Secretary Published Monthly by Bryan Davis Publishing Co., Inc. 52 Vanderbilt Avenue 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-r-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.