Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000462
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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442 CINEMATOGRAPHIC ANNUAL the steam table. The press is then closed, and by means of a hydraulic pressure of more than a ton per square inch the record material is pressed into the minute sound grooves of the matrix. Cold water is then turned into the dies, and after a short inter FIGURE 9 Electro-Magnetic Reproducer val the press is opened and the record is separated from the matrix. It is then ready for use. The same operation is repeated as many times as required to provide the desired number of copies. Both in cost and time required the making of these records is very small compared with sound-on-film records. In order to re-create sound from a finished record in the theatre, some form of reproducer must be provided which can first convert the wavy groove on the record into electric currents which will be essentially the same in form as those set up by the microphone on the stage. For this purpose a device similar to a recorder, but equipped with a needle instead of a cutting stylus, would serve. The type of reproducer ordinarily used in the theatre is illustrated in Fig. 9, and though different in physical form, it is the same in principle. The most important difference lies in the provision of a permanent magnet to produce the flux across the armature instead of the electro-magnetic field coil used in the recorder. This results in a very desirable simplification of the theatre equipment.