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 #:
000125
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:
August 22, 2024
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ACOUSTICS 105 Table 2. Sound Absorption Coefficients Akoustolith (artificial stone) 0.36 Brick set in Portland cement .025 Brick wall, 18 inches thick .032 Brick wall, painted .017 Carpets, unlined .15 Carpets, lined .20 Carpets, heavy, with lining .25 Carpet rugs .20 Celotex, one-half inch thick .31 Cheesecloth .019 Cocoa matting, lined . 17 Concrete .015 Cork tile .03 Cretonne cloth . 15 Curtains, chenille .23 Curtains, in heavy folds 0.5 to 1.0 Flax, 1 inch thick, with unpainted membrane .55 Glass, single thickness .027 Hair felt, 1 inch thick, with unpainted membrane .55 Hair felt, 1 inch thick, with painted membrane .25 to .45 Hair felt, 2 inches thick, with unpainted membrane .70 Hair felt, 2 inches thick, with painted membrane .40 to .60 Insulite, one-half inch thick .31 Linoleum .03 Marble .01 Oil paintings, including frames . 28 Open window 1. 00 Oriental rugs, extra heavy .29 Plaster on wood lath .034 Plaster on wire lath .033 Plaster on tile .025 Stage opening, depending on stage furnishing .25 to .40 Varnished wood .03 Ventilators (50 per cent, open space) .50 Wood sheathing .061 Wood varnished .03 Table 3. Total Absorption by Individual Objects Audience, per person 4.7 Church pews, per seat .2