PEIRCE. 



BALLISTIC GALVANOMETERS OF LONG PERIOD. 



307 



whole transfer of electricity in the induced currents in the two cases. 

 Besides the exciting coil, this magnet had another similar coil wound 



Figure J. 



about the core. Curves V and W show the growth of reversed and di- 

 rect currents in the exciting circuit when the last named coil was closed 

 on itself, and the currents induced in it hindered the establishment of the 



