Govt. Print. Off., 1926 - Mathematics - 9 pages
Principles and examples of architectural acoustics are worked out showing their practical application to the planning of a new auditorium or to the curative treatment of one that has proved to be unsatisfactory.
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1.8 seconds absorbing material absorption coefficients absorption units Acceptable limits acoustic quality Audi beration Brick wall calculation Carpets Celotex coffering compression Cork tile cubic feet curved walls dead spots DEFECTS OF AUDITORIUMS definite or articulate dimensions Distributing echo empty room excess existing auditoriums explained later floor formula frequency full audience Hair felt inaudibility incident sound individual objects Inst intensity interior finish irregular Jour limits of reverberation Maximum audience one-half inch thick open window orchestra oval painted panel path perfect absorber perhaps PLANNING AN AUDITORIUM Plaster produced proscenium arch quantity range rarefaction ratio rectangular reduce the rever reflected sound regular reflectors room in cubic Sabine Sabine's Seat cushions seconds Half audience smooth sound foci spots and sound square feet Stage opening syllable Table theater tion torium total absorption unpainted membrane upholstered upper limit USUAL DEFECTS Varnished Volume of room wall or ceiling Watson wave length wire lath Wood