CHAFFEE. — IMPACT EXCITATION OF ELECTRIC OSCILLATIONS. 283 



If, now, M be assumed proportional to N^ the above expression may 

 be written, 



N^ = KRi, where ^ is a constant. 



This is the relation which must probably approximately hold in order 

 that the reaction of the secondary current on the primary circuit may 

 not exceed a certain amount, and is, therefore, for a given R2 or radia- 



60 



40 



g 30 



< 



20 



10 



50 



40 



30 O 



UJ 



O 



20 



UJ 



OS 



10 



6 



8 10 

 OHMS. 



12 



14 



16 



18 



Figure 9. Power and Efficiency Curves with Changing Resistance. 



A2 = 100 meters. 

 lo = .55 ampere. 

 Ci = 175 X 10-5 M./. 

 C2 = 86 X 10-5 ix.j. 



tion coefficient of the secondary circuit, the condition for maximum 

 power. This will later be shown experimentally to be nearly true. 



In Figure 9 is plotted the power, I^R%, in watts dissipated in the 

 secondary resistance for the conditions represented in Figure 8, from 

 which the curves of Figure 9 were obtained, and, also, the correspond- 

 ing efficiencies (dotted lines) exclusive of the power lost in the outside 

 resistance, Ro, are shown. The heat lost in Ro is omitted in calculat- 

 ing the efficiencies because, as will be stated later, by a proper choice 

 of generator this resistance can be left out. 



The full line curves of Figure 10 were derived from those of 

 Figure 8, and are constant secondary current curves plotted to the 



