the Hot Gases from Flames. 33 



experiment in which the conducting gas is passed up a much 

 wider tube (4 cm. radius) with a velocity of over 100 cm. 

 per second, and the leakage from a terminal in the axis of 

 the tube taken as before. 





T 



VBLE 



III. 





E.M.F. 









Current 



40 volts 









8 



80 „ 









15 



120 „ 









23 



160 ,. 









31 



200 ., 









37 



240 „ 









43 



280 „ 









50 



Curve III. is drawn from these numbers and shows that 

 up to the voltage used the current is approximately propor- 

 tional to the E.M.F. On the other hand, with a narrower 



Fig. 3.— Curve III. 





20 30 40 50 



1 Division = 4 volts. 



70 



tube and a smaller velocity of the carriers up the tube, the 

 maximum value of the current has been reached for an 

 E.M.F. of a few volts. 



If a second terminal C be placed in the tube above B and 

 connected to the electrometer and charged to a potential 

 sufficiently great to give the maximum rate of leak ; then if 



Phil. Mag. S. 5. Vol. 46. No. 278. July 1898. D 



