S6 Dr. C. A. Skinner on the Potential Gradient in 



Table I. — Potential Gradient in Volts per Centimetre for 



Various Currents. Gas-pressure *6 mm. 



Position of Anode 17. Position of Cathode 162. 



Position 



•5 m.a. 



1 m.a. 



2 m.a. 



4 m.a. 



6 m.a. 



in mm. 







24-5 



27-5 



18-5 



19 



235 



25-5 



21 



27-5 



28-0 



310 



30-0 





25 



270 



27-5 



290 



27-0 



10-0 



30 









27-5 





35 









26 5 





40 



270 



27-0 



29-0 





130 



50 









24-0 





6) 



28-5 



30 



290 





120 



62 









265 





70 





305 





21-0 





80 



29-0 



295 



240 



14-5 



7-5 



90 



230 



170 



155 



11-5 





100 



130 



10-5 



9 5 



6-5 



45 



110 



90 



4-5 









120 



2-0 





20 



1-0 







130 



2 



•5 









140 



35 





•5 







150 



130 











Table II. — Potential Gradient in Volts per Centimetre for 

 Various Currents. Gas-pressure l'O mm. 

 Position of Anode 17. Position of Cathode 162. 



Position 

 in mm. 



35 m.a. 



- 4 m.a. 



•5 m.a. 



•7 m.a. 



1-5 1 

 3 . jm.a. 



00 m.a. 



19 



34-5 



18-5 



18-5 



365 



41-5 



43-5 



25 



39-5 



42-0 



42-5 



43 







38-5 



40 



385 



39-0 



39-5 



39-5 



40-5 



31-0 



60 



410 



42-0 



41-0 



42 



42-0 



275 



80 



42-0 



430 



42-0 



425 



35 



22-0 



100 



390 



400 



40-5 



31-5 



20-0 



11-0 



120 



405 



• 38-5 



345 



14-5 



60 



6-5 



135 





420 











140 



42-5 













150 



21-0 











1-0 



