﻿to maintain a Current in a Gas at Low Pressures. 225 



in the main circuit, the potential-difference at the electrodes 

 in the gas would be high. Series of readings were accord- 

 ingly taken for values of the potential at the electrodes when 



Fte. 9. 



§ 450 



440 



430 



420 



410 



400 



390 



380 



370 



ZZk 





1 ! 



i J 













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i 









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i 

 i 



3 ^ 



^ 











/'/ 



rjTf \ 



fJ=G. 



57/7Z/7Z 









J 



7/ 







\N 1 

 " 2 



Total 



]/ = 44Q l/on 

 = 4-80 



vT. 





7 



v/ 









.. 5 

 - 4 





= 56 



= 7?t 









V / ! 











































i 















50 60 70 



-> Cufff?Ef\'T 



Pig. 10. 



400 

 390 

 380 

 370 

 360 

 350 

 340 

 330 



10 ^0 30 40 50 60 70 80 90 100 110 120 130 140 150 I60 ; 



— s- Current 



the number of the cells was kept constant and the current 

 altered by changing the resistance of the circuit, a number 

 ■of curves for different forces being obtained. 



Two sets are given, figs. 9 and 10, the E.M.F. of the cells 

 Phil. Mag. S. 6. Vol. 12. No. 69. Sept, 1906. Q 



M 





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