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

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 #:
000205
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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MAINTENANCE AND INSPECTION 185 position, and the photo-cell door closed, cut the light to the photo-cell by passing a cardboard punched with several TVinch holes, between the mazda lamp and the lens barrel in the optical system. Plug in the monitor loudspeaker and listen for a series of "plunks" during the test. Throw switches "LS" and " Cones" on sectionalizing panel to "Qn" and switch "Amp. No. 1" and "Amp. No. 2" to correct position. Listen for series of "plunks" in auditorium loudspeakers when making the test. A more complete check may be obtained by running a reel of sound and listening to the monitor and auditorium loudspeakers individually, as described above. E. Storage Batteries The specific gravity of each storage battery should be measured before each show. Specific gravity full charged 1275 Specific gravity half charged 1225 Specific gravity discharged 11 80 II. WEEKLY INSPECTION AND CHECK A. Projector and Reproducer The machine speed should be checked, if a D. C. motor is used, and the dial at the end of the motor shaft set to the corrected calibration as given under "Dial Settings for Motor Control." If an A. C. motor is used the speed will be constant and will require no adjustment. B. Optical System Lamp connections on the optical system should be inspected once each week. C. Amplifier Make careful inspection of all wiring and connections. D. Loudspeakers Make tests with a short reel of sound film as follows: I. With an amplifier in normal operation condition, and