Self-induction in WehneWs Interruptor. 



247 



Ruhiner *, and much light was thereby thrown on the action 

 of the interruptor. The following experiments, which I have 

 recently performed, may be considered as confirmation of 

 Ruhmer's view : — 



(a) A Wehnelt's interruptor B was placed in series with 

 a coil N as shown in the annexed figure (fig. 1). When the 



Fig. 1. 



strength of the current i was below a certain value, the 

 interruptor did not act, the active electrode of the latter 

 becoming simply red-hot, and the process was simply an 

 electrolysis. But inserting iron bundles in the coil so 

 as to increase its self-induction, the interruptor began to act 

 at once when the circuit was closed. The same thing also 

 took place even when there were no iron bundles in the coil, 

 by merely increasing the current to a certain requisite value. 



- Fiff.2. 



(&) A given induction-coil M and a coil N were joined in 

 series with the interruptor B, the latter being shunted by a 

 condenser of large capacity (fig. 2). 



* E. Ruhmer, Elelctrotechmsche Zeitschrift, Heft 26, 1899. 



