VIBRATING TELEPHONE DIAPHRAGMS. 



433 



The inference from the preceding results was that a distortion 

 loop was due to the presence of local and loosely clamped diaphragm 

 boundary areas, having a natural frequency independent of the main 



Vibration Explorer used 

 as Cap of Telephone 

 /?ece/Ver. Clamp of 

 Explorer attached by 

 two (Screws diametricallt^ 

 opposite. 



An Absorption^ ivhich 

 centers about no particular 

 frecfuency, /s apparent in 

 the resonance region. 



Telephone R'ECEivEf? B. 



Load a^ Cenfer: OSPSam 



FfECEIVEF? CLAMPED 

 IN 

 ViBFPATION EIXPLOFPEFP 



Ifesistance'^^ '^^ '^° '"^ ^ '" ^'^ ''^ '"' ^^ *" 

 Fig. 12. Distorted Impedance Circle with Unlocalized Distortion. 



diaphragm, and having constants r, m, and s of their own. The 

 local areas received their vibrational energy from the main dia- 

 phragm. According to this view, it would only be necessary to 

 attach a local vibrational system, with its own r, m, and ^ to a prop- 



