KENNELLY AND PIERCE. 



TELEPHONE RECEIVERS. 



123 



curves of Figures 2 and 3, where the observed points are indicated by 

 black dots, and the points calculated from the formulas are represented 

 by the circles. The agreement between the calculated points and the 

 curve of observations in the case of the watch-case instrument (Figure 

 3) is within about 1%. In the case of the Bell instrument " Rb," in 



TABLE V. 



Resistance and Reactance of Experimental Monopolar Receiver, 

 WITH 0.3 Volt at Terminals of Receiver. 



order to have sufficient range of frequency, the writers had to use 

 some of the earliest observations, taken before they had learned the 

 precautions required for accurate results. But in this case also, the 

 values calculated by the formulas (1) and (3) agree closely with the 

 curves that best represent the observed points except in regions where 

 the latter are uncertain. 



As a further illustration of the approximate constancy R X L taken 

 with the telephone damped, reference is made to Table VII, which 

 contains this product at different frequencies for receiver Rb with 0.42 



