54 Prof. D. N. Mallik and Mr. A. B. Das on Electric 



Z = electric force in the direction of z and E, in the direction 

 of p, while H = magnetic force, which we know is mainly 

 in the direction of p (Phil. Mag. Jan. 1908). 



Fiff. 12 b. Curve II. 



fo >5 















\ \ 



| | | ! ! 



; 



. 













i 



\ ! 





A 





I 









i 











' 



















i 









1 































i 





























I 















































































/ 





























/ 



/ 

























/ 



' 























— 





/ 



/ 



























/ 



























s 





i 







\ 

















iP* 



■40 50 60? 



'—> Reflection in degrees. 



70 



30 



90 



[Nature of the discharge. — Showery, with very fine striae. It takes a 

 certain time for the striae and illumination to develop after the 

 induction-coil is started.] 



Now, considering the equation (3) (to which, alone, we 

 shall confine ourselves), if we have N negative and n positive 

 ions per unit length, in any stream (masses m 1 and m 2 

 respectively), we have, taking moments about the axis and 

 summing up, 



j (mJS + m 2 n) ds j (p 2 0) + j (A : N + A 2 n)p 2 ds 6 



+§Bp(N + n)ds0=$RpeQ$ + n)dsk . . (4) 



as the equation of motion of any stream of discharge. 



Now we may assume, as in Phil. Mag. Oct. 1912, the 

 action between two streams of lengths ds. ds' to be a repulsion 



where q, q' are the velocities of positive and negative ions, 

 a, b their radii (assumed spherical), r the distance between 

 ds, ds', K the S.I.C. and V the velocity of light. 



