662 Dr. A. S. Eve on the Effect of 



The mobility of the ions was also calculated to be about 

 1*2 cm. /sec. per volt/cm. This was done by raising T to a 

 few volts, when the current measured in terms of divisions a 

 minute with electroscope B was — 



Voltage on T. 







32 



ions to centre. 

 211 

 18-1 



ions to centre. 

 19-0 

 16-5 



Ratio n-j-/n- 

 I'll 



110 











Fig 



.3. 









Z4 



















i 



i + 

















< 



clean 



> — 

















0} 

























































8 



















4 



v 







artificial 



/°9 











V. 









i 



fog 



c 



> J 



ZOO 



Volts onT 



8oo 



When two balls of loosely wound wire were placed in the 

 tube near V, the current measured at the electroscope B was 

 reduced by diffusion, — 



+ ions to centre. 



— ions to centre. 



Eatio n+/n~ 



No wire balls ... 20*3 



18-2 



I'll 



Wire balls 6*3 



5-0 



1-26 



This indicates that more negative than positive small ions 

 are lost by diffusion to the wire balls. Afy hen the lengths of 

 the tubes between V and A were varied, it was found that 

 the ionization current was less for long than for short tubes. 

 The loss is, of course, due to recombination and to diffusion 

 to the sides of the tubes. Some experiments were made to 

 test the effect of altering the length of the tube between 

 V and A, — 



Length. 10 cm. 200 cm. 



n + /n- 1-10 1-35 



