AUSTIN: EXPERIMENTS WITH THE AUDION 



83 



element galvanometer in the sending circuit and I 2 the readings 

 of the detector galvanometer in the telephone transformer. 

 Ii is proportional to the high frequency sending currents and 

 therefore to the high frequency currents received; I 2 is propor- 

 tional to the value of the current pulses in the receiving telephone 

 circuit. Column three, Table I shows that the telephone pulses 

 (response) are proportional to the square of the high frequency 

 currents received. An experiment similar to the above except 

 that the receiving circuit had the ultraudion connection, but so 

 adjusted that no local oscillations were produced, shows that the 

 same law holds as in the case of the old audion connection. 



TABLE II 

 Oscillating Ultraudion 



DAMPED EXCITATION 



TABLE III 

 Oscillating Ultraudion 



UNDAMPED EXCITATION 



Tables II and III show the results with the audion in ultra- 

 audion connection and oscillating. In Table II the sending 

 waves are damped as in Table I, while in Table III the sending 

 waves are undamped, the sending wave meter being excited by 



