Irreciprocal Conduction. 



139 



Table II. — Showing Effect of (1) Change of Current- 

 strength, (2) Previous history of Electrodes. 



k= constant of galvanometer = '00051 ampere. 



The electrodes were of platinum, size not noted, and the 

 electrolyte was strong pure H 2 S0 4 . 



Treatment of Elec- 

 trodes. 



Ohms in 

 circuit with 

 voltameter. 



Deflection. 



Remarks. 



1. (During experiments 



30 



117 



Deflection steady. 



2. 1-7 the current 



20 



162 



„ less steady. 



3. was kept continu- 



15 



191-194 



Vibrations more marked. 



4. ously on in the 



10 



235-238 





5. film-forming (j8) 



5 



315-321 



Vibrations, which were 



direction.) 







not regular. 



6. 



3 



365-370 



i 



7. 







4 



Film formed ; the deflec- 

 tion being reduced im- 

 mediately to 4. 



8. Short-circuited vol- 









tameter for a time. 



3 



4 



>> t 



9. Current reversed for 









an instant 



3 



4 





10. Electrodes heated to 









redness 



3 



4 



>» >» >> 



11. Short-circuited vol- 



tameter for a time. 



6 



4 



»> >» )> 



12. 



10 



212 





13. Current reversed for 









an instant 



9 



7 



230-234 

 235-250 





14. 



15. 



6 



250-20 



Film formed ; deflection 

 reduced to 20. 



16. „ „ 



5-5 



270-20 



Deflection at first 270, 

 then fell gradually to 

 150, and then a rapid 

 fall to 20. 



17. Electrodes reheated . 



5-5 



220-20 



Deflection fell graduallv 

 to 20. 



18. Current reversed an 









instant and then 









voltameter short- 









circuited 



6 



270-300 





10. 



5-5 



^75-310 





20. 



55 



280-300 





21. Electrodes reheated.. 



55 



200-4 





22. Current reversed an 









instant and then 









voltameter short- 









circuited 



55 



270-310 





23. Electrodes reheated 









and allowed to 









stand 5 minutes in 









the acid 



.-)••» 



\ 



Film quickly formed. 



