Phil. Mag. Ser. 6, Vol. 14, PI. IX. 



Three successive interruptions of the circuit of an electrical tuning-fork. 



Fig. 7, 



vvvvVS \Ai\A V s 



Oscillations of secondary of induction-coil produced by an alternating current of 

 35 amp. in primary. No condenser in secondary. 



Fig. 8. 



I v v v v w y ^ •«/ 





Oscillations of secondary circuit with condenser nearly in tune with alternator. 

 Primary current = 1 ampere. 



