218 



Profs. D. N. Mallik and A. B. Das on 



In T x the second stage is absent, and the second portion of 

 the curve with it. (Curve III, fig. 2.) 



Fiar. 2. 



bO 





I 





















/ 



























^ 





""] 

































J 



A* 



















/ 







V 

























/ 



/ 











/^ 













1 



f 























/ 

























































. 



> 



I t 



\ 



5 ( 



5 



r i 



i 



? i 







1 i2 



• > Spark length in m.m. 



Spark-length of the induction-coil = 19*94 mm, 



12. When, however, the voltage of the induction-coil is 

 increased, the discharge in T 1 also passes through all the 

 various stages and the curve I (fig. 3) exhibits the usual 

 peculiarities in their entirety. 



13. These characteristics are the same as those exhibited by 

 De La Rive tubes. They are, therefore, common to all 

 electric discharges, as they should be on theoretical grounds. 



14. It is possible to work out an approximate theory 

 giving a relation between pressure, potential difference, 

 and the length of the discharge-tube, but the formula 



