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 #:
000415
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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REPRODUCTION IX THE TIIKATRE 395 the reproduced sound. A trained musical ear may detect pitch changes caused by speed variations greater than one-fifth of one per cent, particularly if these occur as fluctuations. The ordinary untrained ear may detect changes of less than one per cent. To further insure against such discernible changes in pitch, the Western Electric system makes use of a device known as a motor FIGURE 10 control box which maintains a motor speed regulation of onetenth of one per cent, despite the ordinary variations of power supplies. The motor control box furnishes an electric method of accurately controlling the motor speed. Its contents are somewhat elaborate and need not be described in detail for the purposes of this paper. A brief statement of its bridge circuit is given below : Fig. 12 shows the governing system. The circuit is a special bridge circuit. One arm of the bridge is made up of a fixed inductance L and fixed condenser C in series. The valves of C and L are such that they tune the circuit at 720 cycles. Another arm