generated in a High-tension Magneto. 



147 



(1) The self-inductance of the primary coil, L x . 



(2) The self-inductance of the secondary coil, L 2 . This 

 •coefficient is defined as the total induction through the 

 secondary coil due to the current in this coil, divided hy 

 the value of the current at the end J. Owing to the fact 

 that during the oscillations which occur after break the 

 current is not uniformly distributed along the secondary 

 wire, but is greatest at J and zero at the sparking-plug end 

 (until sparking begins), the value of L 2 is somewhat smaller 

 than that found by experimental methods in which the 

 current is uniformly distributed. 



(3) The inductance of the primary coil on the secondary, L 21 . 



(4) The inductance of the secondary on the primary, L 12 . 

 This coefficient is defined as the induction through the primary 

 winding due to the secondary current, divided by the value 

 of the latter at J. Owing to the non-uniform distribution of 

 -current in the secondary L 12 is somewhat smaller than L 21 . 



(5) The capacity of the primary condenser, C x . 



(6) The capacity of the secondary circuit, C 2 . This is 

 defined as the charge on the secondary coil and the bodies 

 (distributor segment, sparking-plug terminal, etc.) connected 

 with it, divided by the difference of potential at the sparking- 

 plug. The capacity C 2 is distributed along the secondary 

 wire, and its value is doubtless largely influenced by the 

 proximity of the surfaces of the pole-pieces and the core 

 which are at zero potential. 



(7) Finally there are the effective resistances R l3 R 2 , of 

 the primary and secondary coils. 



Probably none of the above quantities are strictly constant 

 during the oscillations subsequent to break. The inductances 



Fig. 2. 



rv, 



Showing- armature in position of maximum inductances. 



vary with the magnetic state of the core and with the position 

 of the armature ; they are greatest in the position shown in 

 fig. 2. The secondary capacity also varies with the position 



L2 



