Sound motion pictures : from the laboratory to their presentation (1929)

Page scan 000150 from Sound motion pictures : from the laboratory to their presentation

Record Details:

Title:
Sound motion pictures : from the laboratory to their presentation
Date:
1929
Publisher:
Garden City : Doubleday, Doran & Company, Inc.
Volume:
Sound motion pictures : from the laboratory to their presentation
Leaf #:
000150
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 22, 2024
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ISO SOUND MOTION PICTURES All filaments are now burning. Let them burn for five minutes; then turn on the plate current and adjust it for the amplifiers. These are controlled by the voltmeter transfer switch and regulated by the plate controls on the 519-A filter panel and the last control on the 520-A rectifier panel. They are all marked under the stage switches on the 519-A filter panel to show the proper plate current. Next adjust the 8-B amplifier to read as follows: Plate Current No. 1 tube 0.5 to 10 mils. Plate Current No. 2 tube 8 to 18 mils. Plate Current No. 3 tube 16 to 28 mils. Filament Current No. 1 tube 0.95 amp. Filament Current No. 2 and 3 tubes 1.55 amp. These are all tested from your 514-A meter panel. Turn on horn switch. II. SHUTTING DOWN ROUTINE Turn off" the horn switch. Turn off the 520-A rectifier panel. Turn off the 8-B amplifier panel. Turn off the 521-A filament supply panel. Turn off* the 220volts A. C. switch. Turn off* the A, H, and F battery switches. III. STARTING AND TESTING A. Film Amplifier Equipment If the film pick-up apparatus is to be used, prepare it for operating, as explained below, before starting up the main amplifier. It is extremely important to have the exciting lamp on the film pick-up attachment properly adjusted, with the current at the proper value, as will be specified. The object is to obtain a bright, clear illumination of the photo-electric cell. If the light is not properly adjusted, the volume heard