194 



THE POPULAR SCIENCE MONTHLY, 



rs 



m- :\, "^r';>...,^,''''^--''' 



-,=r r 



suits cleciflodly 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 diapliragm (B), as shown in Fig. 5, and was 



