412 



AUSTIX— ENERGY IX RADIOTELEGR,A.PHY. 



[April 19, 



by multiplying the effective value of the field E by the height to the 

 center of capacity of the receiving antenna. If we are dealing with 

 continuous oscillations, the received current will then be given bv 



(2) 



/.= 



Eh., 



(undamped oscillations) 



where R is the high frequency resistance of the receiving system. 



In the case of damped oscillations, however, on account of the 

 form of the wave train of oncoming oscillations and that of the 

 resulting current train in the antenna, the value of the received cur- 

 rent I ji is equal to 



Eh„ 



= , (damped oscillations) 



I.= 



^ 



R^i + 



where h^ and 8^ 'ire the decrements of the sending and receiving 

 antenna systems. 



By means of thermoelements in the antennas, measurements of 

 this kind have been made in several receiving stations in Washington 

 using the high power station at Arlington and the station at the 

 Washington Navy Yard for sending.® 



The results of the calculated and observed values are given in 

 Table I. It is seen that the observed values vary between 40 per 



TABLE I. 



' In these experiments the distances between the sending and receiving 

 stations lay between 1.5 and 10 wave-lengths. The greatest possible error due 

 to the inapplicability of the inverse distance law to these short distances 

 would be about 10 per cent. No evidence of ground absorption at these 

 distances has been observed. 



