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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.