File:Collected papers on acoustics (1922) (14761980291).jpg

Identifier: cu31924022547024 (find matches)
Title: Collected papers on acoustics
Year: 1922 (1920s)
Authors: Sabine, Wallace Clement
Subjects: Architectural acoustics
Publisher: Cambridge, Harvard University Press (etc., etc.)
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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o qualities, dependent on the size of the auditorium and the useto which it is to be apphed. Geometrically the foregoing cases are comparatively simple. Ineach case the room is a simple space bounded by plane, cylindricalor spherical surfaces, and these surfaces simply arranged with refer-ence to each other. The simplicity of these cases is obvious. Thecomplexity of other cases is not always patent, or when patent it isnot obvious to a merely casual inspection how best the problemshould be attacked. A large number of cases, however, may behandled in a practical manner by regarding them as connectingspaces, each with its own reverberation and pouring sound into andreceiving soimd from the others. An obvious case of this is thetheatre, where the aggregate acoustical property is dependent onthe space behind the proscenium arch in which the speaker stands,as well as on the space in front of it. In another sense and to a lessdegree, the cathedral, with its chancel, transept and nave may be
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Fig. 7. Design for St. Paul.s Cathedral, Detroit. Cram, Goodhue and Ferguson. Architects. 142 ARCHITECTURAL ACOUSTICS regarded as a case of connected spaces. The problem certainly takeson a simpler aspect when so attacked. An extreme and purely hy-pothetical case would be a deep and wide auditorium with a verylow ceiling, and with a stage recess deep, high and reverberant, infact such a case as might occur when for special purposes two verydifferent rooms are thrown together. In such a case the reverbera-tion calculated on the basis of a single room of the combined volumeand the combined absorbing power would yield an erroneous value.The speakers voice, especially if he stood back some distance fromthe opening between the two rooms, would be lost in the productionof reverberation in its own space. The total resulting sound, in aconfused mass, would be propagated out over the auditorium. Ofcourse this is an extreme case and of unusual occurrence, but by itsvery exaggeration serves to i

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