122 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



equation were determined by using two of the observed points on each 

 of the resistance-frequency curves. 



Another more interesting fact, obtainable from the experimental 

 curves, is that the product of the damped resistance by the damped 



OHM 



280 



HENRY 



.05G0 



2000 4000 GOOO 8000 



Angular Velocity 



10000 12000 



Figure 3. Curves of damped resistance, inductance, and reactance vs. 

 angular velocity, for watch-case receiver, with 0.3 volt at terminals. Dots, 

 observed; circles calculated. 



inductance, for each of the two telephones, is approximately a constant 

 independent of the frequency. That is, for the bipolar "Rb," at 0.3 

 volt, 



L = -~- henrys (3) 



R 



and for the "watch-case" at 0.3 volt 



L = 



5.88 

 R 



henrys. (4) 



The degree of accuracy with which these formulas accord with the 

 observations is shown by the damped resistance and inductance 



