84 AUSTIN: EXPERIMENTS WITH THE AUDION 



an oscillating auction. Here the note in the receiving telephone 

 is produced by the beats between the local and incoming oscil- 

 lations, being rough from the damped oscillations but clear and 

 musical from the undamped. 



Column three in each of the last two tables shows that the 

 response in the case of the local oscillations is proportional to 

 the received high frequency current and not to its square as was 

 the case in the non-oscillating audion. The value of the ratios 

 in the third columns shows that the response of the receiving- 

 telephone is greater for undamped oscillations than for damped, 

 other things being equal, in the ratio 1.4 to 1. But assuming 

 equal decrements in the sending and receiving circuits, which is 

 probably at least approximately correct, this represents equal 



E 



sensitiveness, since in the case of undamped waves I = — and 



K 



E 5i 



in the case of damped I = . where - represents the 



V- ■ 6i """ s ' 



02 



ratio of decrements in the two circuits. 



In addition to the experiments with the detector and gal- 

 vanometer, determinations have also been made of the relative 

 sensibility of the old audion and the oscillating ultraudion con- 

 nections. For this the shunted telephone method was used with 

 spark excitation, either distant signals or from the buzzer. It 

 was found that for unit audibility with the old audion connection 

 the oscillating ultraudion gave from three hundred to one thou- 

 sand audibility, but as the law of response is different in the 

 two cases the ratio will of course decrease as the signals grow 

 stronger. With the non-oscillating ultraudion the signals are 

 from twenty to forty times as strong as with the old audion. 

 This ratio becomes greater if the ultraudion is brought nearer 

 to the oscillating condition. 



The experiments show that the atmospheric disturbances are 

 but little louder in general with the oscillating audion than with 

 the old audion; the sounds are more continuous in the former, 

 however. 



