Specific Velocities of Ions in the Discharge from Points. 85 



Kohlrausch's value for hydrogen in the ordinary electrolysis 

 of solutions is 003 ; our values thus lie between those for 

 hydrogen and for many of the other metals respectively. 



Curves I. 



£ 5 



2 3 











/"N 



> 





T(//?f 



£A/r/A 



^f 













OZMk 



7TO-AM/ 



\y. 







1 'N 



i 















I J 

















1 

















i 















/ 4 



\ 















1 ' 

















I t 















i 



















I i - 















( 



/ / 















/< 



i 















/ 

















/ 















/ / 

















5 , 















y 



*' 













c 



// 















^^ // - c 



> x • 





























,( 



y 







_ 









•8 1-2 1*6 2-0 



Centimetres (z). 



Variations in the Value of V. 



It is of course inevitable that the calculated values of V for 

 given conditions should differ to some extent among them- 

 selves owing to errors of observation ; but when, as in the 

 case of negative discharge in hydrogen, the probable errors 

 of observation are not sufficiently large to explain the 

 differences observed, it becomes a question whether they may 

 not be due to real changes in the motions of the ions. 



In fig. 2, (p. 86) Z\ z 2 represent the two positions of the point 

 in the " double-position" method, and p Y p 2 the corresponding 

 pressures, z is measured from 0, the centre of the plane AB 

 drawn to touch the front surface of the ring R. If z is the 

 distance of the point where the straight part of the pressure- 



