Certain Types of Electric Discharge. 



219' 



obtained is much too complicated for discussion to serve any 

 useful purpose, at the present stage. 



Fig. 3. 











**&> 

















a> 



/ 



















Y" 

















zo 



<t>/ 









7 



f 



















10 20 30 



> Spark length in m.m. 



Spark-length of the induction-coil = 46 mm. 



15. In the particular case in which the curve is a straight 

 line, the formula obtained in a previous paper was 



V = 



X 

 P 



q + q 



,V 



q + q' 



where Y is the difference of potential between the terminals 

 of the induction-coil when the circuit is open, X' the electric 

 intensity, assumed to be constant throughout the tube, q, q', 

 velocities of +ionsand corpuscles, and A, X/, their mean free 

 paths, p being the pressure. 



16. Now experiment shows that X itself depends on the 



