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 #:
000314
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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294 CINEMATOGRAPHIC ANNUAL 6* FIGURE 3 the wave length (measured in feet) and the frequency is equal to the speed of sound, viz., about 1100 feet per second. Thus a fairly low pitched tone, say 200 vibrations per second, has a wave length of 5V& feet ana* a ~~~ high pitched tone, say 5500 vibrations per second has a wave length of .2 feet. We have now established what we mean by frequency, pitch, wave length, speed of sound.* The next idea is that of loudness. This is found to depend on the distance through which the plunger (or other vibrating body which sets up pressure waves in the air) moves back and forth. The greater is this movement, the greater is the loudness. Here again we find that extremely small movement causes great aural sensations and the actual excursions of a vibrating, sounding body, or of the air particles involved in the propagation of sound, are very very small fractions of an inch. In some types of microphone the movement of the diaphragm does not exceed .0001 inch. Sound may be propagated in solids and in liquids in a manner similar to that in air. * Accompanying the lectures on THE NATURE OF SOUND as given before motion picture studio employees enrolled in the Academy School in Fundamentals of Sound Recording extensive demonstrations were made. These included the use of charts, slides, illuminated ripple trough, projecting oscillograph, amplification of specially prepared records, etc.