564 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Any sudden changes in the inductances cause such sudden changes 

 in the currents as shall keep \_{L + Zi) C\ + (Z + M) C^'] and 



Figure 23. The two circuits of a certain induction coil without iron have 

 equal self-inductances (L, L) and the mutual inductance L\l'2. At the time 

 XF the mutual inductance is suddenly increased to (1.9)L, and the currents 

 which have been following the curves OKF, ADV, take the forms KRGS, 

 DWU. 



[(Z + M) Ci -\- (Z + Z2) C2] momentarily unchanged. In a case fre- 

 quently met with in practice, there is no appreciable inductance in the 



Figure 24. OPW and OZV show, as functions of the time, the fluxes of 

 magnetic induction hnked with the two circuits which carry the currents 

 represented in the last figure. 



