Triode Generator with Two Degrees of Freedom. 719 



(1 — 1), (2 — 2), etc., occurs practically at resonance and for 

 all curves at the same height. 



Fiar. 8. 



In conclusion my sincere thanks are due to Professor H. 

 A. Lorentz for his kind interest and some valuable sug- 

 gestions. 



Physical Laboratory, 

 Teyler's Institute, 



Haarlem (Holland). 



