176 Prof. E. Edlund on the Path of the 



Experiment I. — The bridge h was removed, so that the entire 

 discharge traversed the galvanometer : — 



52-5 

 50-5 

 49-0 



Mean . . 507 

 The coil R was thereupon interposed between e and m } and the 

 deflections obtained were 



30-1 

 27-8 

 27-4 

 27-6 



Mean . . 28-2 

 When R was placed towards n on the opposite side, there was 

 obtained 28*3 



28-1 

 27-9 



Mean . . 27'9 



The coil R was then removed, and, in order to ascertain if there 

 had been any change in the induction-machine, the first experi- 

 ments were repeated. The following deflections were observed : — • 



51-2 



50-2 



46-2 



Mean . . 4^2 



The mean of the first and last experiments is 5O0, and that of 

 the middle ones 28*1. Hence the induction-currents in the 

 coil R had diminished the deflection of the magnetic needle by 

 21*9 divisions. Of these induction-currents, one had the oppo- 

 site and the other the same direction as that of the discharge. 

 The first may be designated as A, and the latter as B. Hence 

 in these experiments the currents A traversed the spark between 

 / and g more easily than the currents B. The spark accordingly 

 acts in this case like an electrical valve. 



Experiment II. — This experiment was made in order to in- 

 vestigate the action of induction-currents upon the deflection when 

 R was interposed between g and e. The currents now traversed 

 R in the opposite direction to the former one. When no coil 

 was interposed in the conduction the following deflections were 

 observed : — 



405 

 42-0 



Mean . . 413 



