THE 



LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OP SCIENCE. 



[SIXTH SERIES.] 



AUGUST 1918. 



XI. On the Potential generated in a High-tension Magneto. 

 By E. Taylok Jones, D.Sc, Professor of Physics in the 

 University College of North Wales, Bangor*. 



[Plate VII.] 



1. Introduction. 



THE arrangement of circuits shown diagram ma tically in 

 fig. 1 is that now usually adopted in the high-tension 

 magneto, as used for ignition in motor-car and aeroplane 

 engines. It consists of a primary coil P and a secondary 



F F 



Diagram of the circuits of a high-tension magneto. 



coil S, both wound on the armature core, and a contact- 

 breaker J in parallel with which is the condenser Ci. While 



* Communicated by the Author. 

 Phil. Mag. S. 6. Yol. 36. No. 212. Aug. 1918. L 





