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

Page scan 00070 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 #:
00070
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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52 SOUND MOTION PICTURES A small amount of additional power and of battery wiring to the driving motor of the projector and its starter are required. For reference there are presented in the following table essential data on the number of units and general performance of the several types of R. C. A.-Photophone reproducing outfits. ATTS OUTPUT NUMBER OF MINIMUM OF POWER LOUDSPEAKER SIZE OF AMPLIFIER CONES AUDIENCE 80 16 6,000 40 12 3,000 20 8 I,5O0 10 4 750 NUMBER OF NUMBER OF INITIAL TYPE PROJECTORS AMPLIFIERS A 2 2 B 2 2 C 2 2 D 2 I A moderate and reasonable amount of supervision of the equipment to keep it in normally clean and efficient condition is all that is required of the projectionist. Changeover from one projector to another at the end of a reel, when the point corresponding to change-over is reached as indicated on the cue sheet, is taken care of by the turning of an accessible handle. In addition to the equipment for projecting synchronized sound-picture film there is available a Photophone disk attachment for the projection of synchronized sound pictures which contain the sound effects on disk records. The disk attachment is a part of the projector. It is thus possi