from an Arc and from Incandescent Metals. 



245 



Loss of conductivity by recombination of the positive and 

 negative carriers. 



(4) In the case of the arc in air the conductivity at different 

 times after the gas left the arc was measured. The conducting 

 gas was forced up the tube A (Fig. 1) at a steady rate, the ter- 

 minals B and C were removed, and a terminal lowered down the 

 axis of the tube from the top, and the leakage from it was 

 measured in different positions. The terminal was charged to 

 such a high potential that all the carriers in the conducting gas 

 were discharged soon after meeting the terminal. The numbers 

 below give the conductivity at different distances from the arc. 



Fig. 3 shows the conductivity curve with distances from arc 



1 

 1 



I 



10 15 20 lh JO 



D/ST/INCE FROM ARC. 

 Fig. 3. 



35 



40 



