636 Prof. Skinner on the Drop of Potential 



Table IX. — Drop of Potential at Anode with Current-density, 



at Different Gas-pressures. 



(Steel Anode, Area 0*25 sq. cm.) 



Current 

 (Milliamps.). 



Current-density 



(Milliamps. per 



sq. cm.). 



Drop at Anode (Volts). 



pO'2 mm. £>=01inm.(approx.). 



0-3 

 0-4 

 0-5 

 07 

 1-0 



1-2 

 1-6 



2-0 



2-8 

 4-0 



55 

 58 

 62 

 66 

 70 



67 

 74 



75 

 82 

 87 



Note. — With pressure gradually reduced and current maintained at 

 0*8 milliampere the series of observations on the drop at the anode was 

 as follows : — 



67, 90, 107, 115, 124 volts; 



the last value corresponding to a total drop between the electrodes of 

 1100 to 1200 volts, a large part of which was the drop at the cathode. 



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