hy the Motion of Positice Ions in a Gas. C15 



during" the di^cliaroe. Considerable inconvenience was caused 

 once when this precaution was not taken, as the thin hiyer of 

 silver on the plate A got burnt away. 



Table YIII— Air. 



p- 



X. 



fi'. 



b,. 



b.. 



1 



350 



113 



1-15 



MO 



1 



437 



•832 



•82 



•84 



•6fi 



350 



•965 



•95 



•975 



■m 



437 



■im 



•76 



•78 



Fig. 4. 





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1 



















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/ 



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 1 





























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/ 















































/ 















/ 



i 































/ 











' i 



v 

































^ 













































•V 





































\ 













/ 























i 











\ 









/ 

























1 

















\ 







o 



< 









































\ 



it) 





/^ 















































~" 

























































































































1 

























































































































' i 























300 







1 















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The experiments with air were made by increasing the 

 distance between the })lates by small steps until a glow' ap- 

 peared in the gas, corresponding increases being made in the 

 potential so as to keep the electric force the same as that for 

 which the distance a was determined. 



The results given in Table VIII. were obtained. At 



•2S '1 



