HELMHOLTZ WIRE. 193 



Both extra currents in the P circuit now gain their full development, and 

 there is consequently retardation of the fall of potential at break. 



The induction currents in the S circuit are now produced by fall and rise of 

 the strength of the currents in the P coil, and not by make and break. The 

 difference in the change is, on the one hand, not so great, and consequently the 

 shocks are not so powerful; but on the other hand, owing to the fact that the 

 circuit is never broken, the break extra current gains its full development, and 

 there is consequently a retardation of the fall in potential, and the induced shock 

 in the S coil approximates more nearly in strength to that at closure. 



The difference is, however, not completely removed ; the opening shock remains, 

 a little stronger. 



