Bauhaus-Universität Weimar

Titel:
Collected Papers On Acoustics
Person:
Sabine, Wallace Clement
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39364/222/
MUSICAL PITCH 
213 
but upon the weave or felting throughout its body, and of course, 
also upon its thickness. An illuminating study of this question 
can be made by means of the curves in Fig. 4. In this figure are 
plotted the coefficients of absorption for varying thicknesses of felt. 
Curve 1 is the absorption curve for felt of one-half inch thickness. 
Fig. 4. Absorbing power of felt of varying thickness, from 
one-half to three inches, showing by extrapolation the 
absorption by thin fabrics of the upper register only. 
Curve 2 of felt of one inch thickness, and so on up to Curve 6, which 
is for felt of three inches in thickness. It is interesting to contem¬ 
plate what the result of the process would be were it continued to 
greater thickness, or in the opposite direction to felt of less and less 
thickness. It is inconceivable that felt should be used more than 
three inches in thickness and, therefore, extrapolation in this direc-
        

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