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 #:
000268
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:
March 28, 2024
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244 SOUND MOTION PICTURES other muscle has just the opposite effect; it is attached to the stirrup bone in such a way that when it pulls the bone cannot vibrate and thus interferes with the conduction of sound to the inner ear. For example, when a noise is unpleasantly loud we throw this muscle into action. The whole purpose of the chain in the middle ear is to carry the sound waves from the drum on its outer wall to a similar sort of membrane on its inner wall. FIG. 9. CROSS-SECTION OF HUMAN EAR On the inside of this is the third compartment, the inner ear. It is filled with fluid, and every sound that we hear reaches the nerve of hearing by conduction through this fluid. The main part of the inner ear is a tiny and very delicate bony structure, spiral in shape. Figure 9 is an illustration showing the arrangement. Along the whole length of the canal, stretched across it from side to side, there is a sort of platform made of delicate fibres. Their number runs into many tens of thousands. Just as the canal becomes narrower as it reaches the top of the spiral,