to Maintain Currents between Coaxial Cylinders. 87 



Table II. 

 Velocities k 2 of negative ions under unit electrostatic force. 



p- 



v.. 



Y. 



i, 



£ 2 xl0 3 . 



760' 



176 



]8-3 



19-2 



317 



2-70 



63 ( 



176 



183 



19-9 



655 



270 



630 



84 



11-5 



12 02 



350 



7-8 



860 



84 



11-5 



12-43 



750 



8-9 



980 



30 



6-22 



639 



305 



40-5 



1600 



30 



622 



650 



570 



432 



1700 



The cylinder was then heated and filled with dry air and 

 exhausted, the process having been repeated several times. 

 The experiments were again made with the drier air, and the 

 results are given in Tables III. and IV. 



Table III. — Velocities k x of positive ions under unit 

 electrostatic force (after the cylinder had been dried). 



p- 



Vo- 



v. 



i. 



1^X10 3 . 



*j P . 

 76U 



400 

 430 



176 

 176 



15-50 

 1550 



16-82 

 18-28 



290 

 680 



1-73 

 1-86 



84 

 84 



9-83 

 9-83 



10-78 

 11-33 



337 

 570 



4-45 

 4-42 



492 

 490 



30 

 30 



5-65 

 565 



6-07 

 653 



305 

 687 



160 

 153 



630 

 610 



Table IV. — Velocities k 2 of negative ions under unit 

 electrostatic force (after the cylinder had been dried). 



p- 



v . 



V. 



i. 



A-..X10 3 . 



Kp 



760 ' 



176 



1837 



1903 



358 



395 



915 



176 



1837 



1943 



580 



387 



900 



84 



11-68 



12-00 



345 



13-1 



1450 



84 



11-68 



12-28 



660 



123 



1360 



30 



644 



649 



300 



140 





30 



6-44 



655 



540 



120 



