od adopted. If the reverberation in a room as changedby the addition of absorbing material be plotted, the resultingcurve will be foimd to be a portion of an hyperbola with displacedaxes. An example of such a curve, as obtained in the lectiu-e-room of the Fogg Art Museum, in Cambridge, is plotted… … 10 20 30 40 so 60 TO 80 90 100 110 120 130 140 ISO120 180 240 300 360 420540 720 900 1080 1260 Total absorbing material Pig. 3. The curves of Figs. 8 and 9 entered as parts of their corre-sponding rectangular hyperbolas. Three scales are employed forthe volumes, by groups 1-7, 8-11, and 12. sorbing…
Architectural acoustics
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