Electric Intensity and Conductivity in Rarefied Gases. 511 



Fig. 5 is for a discharge with not enough E.M.F. to maintain 

 a uniform positive column. A slight diminution of the current 



Fig. o. — Discharge in Nitrogen. 

 Pressure 0-41 mm. Current 0*42 milliampere. 



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 100 

 30 

 80 

 B 70 



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I 2 3 4 5 6 7 8 9 10 II 12 13 14 cms 



in the discharge shown in fig. 3 converted it into one like 

 fig. 5. Thus the positive column appears to break down first 

 at the positive end when the applied E.M.F. is diminished. 



Fig. 6. — Discharge in Nitrogen. 

 Pressure 0-117 mm. Current 019 milliampere. 



NEGAT/VE pQt/T- ■ 



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100 

 90 

 80 



70 a 



o 



60 u 

 o 

 Ph 



50 £ 



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 40 > 



10 II 12 



In fig. 6 there is no positive column, and the low pressure 

 enabled the fall near the positive electrode to be observed 

 easilv. 



