KENNELLY AND PIERCE. — TELEPHONE RECEIVERS^. 151 



same e. m. f. when the diaphragm is damped (Figures 4-7 and Tables 

 VIII-X). 



8. A theoretical explanation of the phenomena is given, and com- 

 putations are submitted in comparison of experiment and theory 

 (Headings V and VI). 



9. The vibration constants of the diaphragms of the several re- 

 ceivers are deduced and collected (Table XI). 



Harvard University, Cambridge, Mass. 

 July 16, 1912. 



