Section III, 1919 [185] Trans. R.S.C. 



On the Design of Continuously Tunable Diaphragms 

 By Louis V. King, D.Sc, F.R.S.C. 



(Read May Meeting, 1919.) 



In order that submarine sound generators may radiate efficiently, 

 theory indicates that the diaphragm should be tuned to the frequency 

 of the alternating current operating the apparatus. Similarly, in all 

 forms of sound receiving apparatus, the response to submarine sound 

 waves is most marked when its fundamental pitch is in resonance with 

 the frequency of the incident waves. In many applications of the 

 ordinary telephone receiver it is important that the diaphragm be 

 capable of tuning over a considerable range of frequency. The pres- 

 ent paper describes how this result is achieved, and describes experi- 

 ments on a submarine microphone receiver fitted with a continuously 

 tunable diaphragm. 



Sec. Ill, Sig. 13 



