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Page:Popular Science Monthly Volume 19.djvu/206

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194
THE POPULAR SCIENCE MONTHLY.
 
PSM V19 D206 Circuit of sound amplification.jpg
Fig. 4.
PSM V19 D206 Layout of light path and sound control circuit.jpg

sults decidedly more favorable to the theory of Lord Rayleigh than to that of Mr. Preece:

1. A strip (A) similar to that used in Mr. Preece's experiment was attached firmly to the center of an iron diaphragm (B), as shown in Fig. 5, and was