CHAFFEE. 



IMPACT EXCITATION OF ELECTRIC OSCILLATIONS. 



Ui 



A2 = 95 metres, is closed, conditions are different on account of the 

 absorption of energy by the secondary circuit, and the primary dis- 

 charges at a rate corresponding to a wave length of about 280 meters. 

 This is about three times A2, showing that the I. C. F. is 3. As the 

 supply current is decreased the primary is forced by the secondary to 

 discharge at this rate until the current has become so small that the 



1000 



800 



600 



400 



z 



-I 



U 

 > 



< 



to 

 cr 



UJ 



I- 

 ui 



2 



200 



.6 .8 



AMPERES. 



Figure 5. Illustration of Syntony to Charge Frequency. 



Ao = 95 meters. 

 Ci = 80 X 10-5 M./. 

 C2 = 60 X 10-5 ^./. 



slower rates corresponding to I. C. F.'s of 4 or 5 are more stable. When 

 conditions are least forced for these values of I. C. F. a maximum of 

 secondary current is observed as shown at Ig = 0.46 in the figure. It 

 is seen that for the steep part of the dot-and-dash curve the I. C. F. 

 j amps between several successive values. It is also now easy to under- 

 stand that the maxima of secondary current naturally occur at values 

 of lo where the I. C. F. is less forced. 



The second condition of syntony, namely, the syntony of wave form. 



