294 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



regard to the wireless telegraphic receiving station. It will not be 

 necessary to neglect the resistances of the system, and, in fact, the in- 

 fluence of the. resistances upon the resonance relations and upon the 

 resultant current is the most interesting part of the investigation. 

 The results of the mathematical treatment are illustrated by numerical 

 examples. 



II. An Experiment on Received Current. 



In pursuing the mathematical development I have received aid from 

 an examination of some experimental data previously published, and I 



Figure 1. Diagram of coupled 

 circuits with impressed e. m. f. 



Figure 2. Electro-magnetically coupled 

 wireless telegraph receiving station. 



take the liberty of presenting one set of these experimental results ^ 

 as an introduction to the theoretical investigation. These experi- 

 mental data were obtained five years ago with a spark-discharge method 

 of excitation instead of with a persistent source of waves, so that the 

 experimental case is to be regarded in this connection merely as an aid 

 to a concrete statement of the problem under considera"tion. 



The experiments were made with a receiving station of the electro- 

 magnetically connected type, like that shown in Figure 2. With electric 

 Avaves of fixed period arriving from a distant sending station the re- 

 ceiving station of Figure 2 was attuned by adjustment of the condenser 

 Ci which is in the side-circuit. Readings of the received current in the 

 side-circuit were made by the use of a low-resistance high-frequency 



^ G. W. Pierce, Physical Review, 20, 220, 1905. 



