254 Prof. Rijke on some Properties of the Induced Current. 



Medium in which the rupture of 

 the inducing circuit was made. 



Greatest striking distance. 





millims. 

 20 

 22 

 21 

 21 

 21 



19 



31 



275 



18 





Ditto 









Ditto 







The ratio between the striking distances obtained by break- 

 ing the circuit in various gaseous media is, for 



Carbonic acid and air . . . 1*01 

 Ammonia and air 1*58 



I do not dare to affirm that the slight increase produced *by car- 

 bonic acid may not be attributed to an error of observation ; but 

 the considerable increase obtained by working with ammonia 

 must doubtless arise from a specific action of this gas. 



The next day, working with oxygen, nitrogen, and chlorine, 

 I found the following results : — 



Medium in which the rupture of 

 the inducing circuit took place. 



Greatest striking distance. 





millims. 



17-1 

 19-5 

 18-5 



16-8 

 17-5 

 16-0 

 22-5 



18-0 



16-2 

 15-0 

 12-5 

 14-5 

 9-5 

 135 











J Ditto 



Ditto 



Ditto 







Ditto 



Ditto 



Ditto .j... 







The ratio between the striking distances obtained by breaking 

 the circuit in these different media was, for 



Oxygen and air . . . 1*096 

 Nitrogen and air . . . 1*075 

 Chlorine and air . . . 0*872 



The numbers differ so little from unity, that I do not venture 

 to say that the differences ought not to be attributed to accidental 

 causes. 



