258 Prof. Rijke on some Properties of the Induced Current, 









Elongation observed 



Deflection 



Position of 

 equilibrium. 



which the 

 rupture was 



Before the 

 passage by 



After the 

 rupture of 













effected. 



the position 

 of rest. 



the inducing 

 circuit. 



Observed. 



Corrected. 





fAir ,., 



Flame ... 

 [Air 



517-8 



502-8 



13-6 



12-2 



516-4 



5172 



502-8 



13-6 



12-8 





517-8 



501-3 



151 



13-7 





fAir 



516-4 



501-8 



14-7 



140 





Flame ... 



516-4 



501-4 



161 



14-4 



5161 





5170 



5000 



15-4 



15-2 





Flame ... 



516-5 



500-7 



16-3 



150 





1 Air, 



516-9 



499-8 



16-3 



155 







5161 



499-6 



16-3 



161 



515-9 



< Flame ... 



516-3 



499-7 



16-2 



15-8 







516-6 



499-9 



160 



15-3 





("Air 



516-3 



498-8 



171 



16-7 





Flame ... 



516-6 



498-0 



17-9 



17-2 



5159 



< Air 



516-1 



498-1 



17-8 



17-6 





Flame ... 



5161 



498-0 



17-9 



17-7 







5163 



498-1 



17-8 



17-4 





fAir 



516-3 



496-9 



18-8 



18-3 





Flame ... 



5161 



496-8 



189 



18-5 



515-7 





516-8 



496-7 



19-0 



17-9 





Flame ... 



5161 



496-9 



18-8 



18-4 





Uir 



5161 



496-3 



19-4 



190 



Taking the mean of these five series of observations, we obtain 

 the following results : — 



Deflections produced by the induced current on breaking the circuit in 



Mean 



Air. 

 129 

 14-9 

 15-7 

 17-2 

 18-4 



15-8 



Flame. 



12-8 



14-7 



15-8 



17-4 



18-4 



Mean 



15-8 



I have no need to say that I was far from expecting this perfect 

 equality between the two final means. 



11. I found some years ago (PoggendorfFs Annalen, vol.lxxxix. 

 p. 166, and Phil. Mag. S. 3. vol. xix. p. 240) that the striking 

 distance of an induced current was considerably increased when 

 the inducing circuit was broken between the poles of an electro- 

 magnet. I had believed until now that, by breaking contact 

 under these circumstances, the deflection which the current 

 produces in Weber's dynamometer would be also increased. 

 However, the experiments which I have adduced (§ 10) were of a 



