TABLE OF CONTENTS IX 



CHAPTER PAGE 



IX. lonization at Cathode of Arc 162 



Assumption that Electrons come from Within the Cathode. 163 



Second Explanation of lonization at Cathode 165 



Cause which Determines the Amount of the Cathode Drop. 166 



lonization at Anode 168 



Discharge of Ions to Electrodes 170 



lonization of Gas Between Electrodes 171 



Velocity of the Ions 1 76 



Action of Arc not the Same as in an Electrolyte 179 



Variations in the Cathode Drop 180 



Variations in the Anode Drop 183 



Variations in the Electric Force Through Arc 184 



Effect Produced by Heating the Cathode 185 



