Bauhaus-Universität Weimar

Collected Papers On Acoustics
Sabine, Wallace Clement
syllabic components. It is to this mutual strengthening of concur¬ 
rent sounds within each element of articulate speech that Vitruvius 
has given the name “consonance.” 
Thus in the computation of the intensity of the voice which has 
come directly from the speaker across the auditorium, it is necessary 
to take into consideration not merely the diminution of intensity 
according to the law of the inverse square of the distance and the 
diminution of the intensity due to the absorption by the clothing of 
Fig. 37. The Harris Theatre, Minneapolis, first design. 
Chapman and Magnej, Architects. 
the audience, but also, as a compensating factor for the latter, the 
diffraction of the sound from above which is ever supplying the loss 
due to absorption, while in computing the intensity of the sound re¬ 
flected from any wall or other surface one must take into considera¬ 
tion all this, and also the coefficient of reflection of the wall and the 
diffraction due to the restricted area of the reflecting element. 
Abstract principles are sometimes tedious to follow even when 
not difficult. In Fig. 38 is shown a photograph taken in an investiga¬ 
tion for the architects, Messrs. Chapman and Magney, of the Harris 
Theatre, to be erected in Minneapolis, which affords an excellent 
example of both favorable and unfavorable conditions in respect to 
consonance. The initial sketch for this theatre offered no problems


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