Tyndall, John, 1820-1893 · New York : Appleton · leaf 447
textile fabrics has been already illustrated,1 a layer ofcambric or calico, or even of thick flannel or baize, being foundcompetent to intercept but a small fraction of the sound from avibrating reed. Such a layer of calico may be taken to representa layer of air, differentiated from its neighbors… … placed so as to form an accute angle with each other. At the endof one was the vibrating reed r; opposite the end of the other,and in the prolongation of P O, the sensitive flame /, a secondsensitive flame (f) being placed in the continuation of the axisof M N. On sounding the reed, the direct…
Sound
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