the TTot Gases from Flames. 



31 



the quadrants connected to B are then separated from the 

 cells, and the motion of the spot of light gives a measure of 

 the current for the E.M.F. of the cells used. 



Table I. gives the numbers for one experiment, the current 

 being expressed in arbitrary units. 





Table 1. 





E.M.F. 





Current 



10 volts 





3 



20 „ 





b' 



40 „ 





12 



80 „ 





25 



120 „ 





34 



156 „ 





38 



188 „ 





39 



Table II. gives the numbers for a similar experiment with 

 the same apparatus when the velocity of the stream of hot 

 gas up the tube A has been diminished by placing on top of 

 A a piece of board, pierced with a number of small holes. 



Table II. 



E.M.F. 



20 volts 



40 „ 

 120 „ 

 200 „ 



Current. 

 10 

 18 

 23 

 24 



Fig. 2. 





















i 















y 

















/ 



r 



































u 





; 



// 





































A 



V 



















r 





















10 



E.M.F. 



20 30 40 



1 Division = 4 volts. 



go 



Curves I. and II. (fig. 2) are plotted from Tables I. 

 and IT., and show at once that the conduction does not follow 



