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 #:
000124
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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io4 SOUND MOTION PICTURES ers have extended the list. The coefficients of some of the more common materials are given below. (i square foot each) : Open window Wood sheathing (hard pine) Plaster on wood lath I.OOO .061 •034 Plaster on wire lath •033 Glass Plaster on tile .027 .025 Brick Concrete Glazed tile .025 .015 .01 Following are some miscellaneous coefficients which are of interest. (1 square foot each): Carpet Cheesecloth Cork 2.5 centimetres thick, loose on floor Audience per person Hair felt 1 inch thick 20 019 16 7 S3 Note: It is frequently of assistance to compare the reflection of sound waves with the reflection of light waves. A white ceiling will reflect about QS -per cent, of the light striking it. The same surface painted a dull black will reflect at the most but $ per cent, of the light. Table 2 gives the absorption coefficients of a number of substances. Strictly speaking, these coefficients will varysomewhat with the frequency of the incident sound. In Table 2 the values given are for a frequency of 512 (Watson). In Table 3 there are recorded values of the total absorption of individual objects; and in Table 4 the absorption coefficients of various substances for different sound frequencies, as determined by the Bureau of Standards.