Resistance, and Self- Capacity of Magneto Windings. 67 



loss prior to sparking by method 1. The difference is 

 simply the altered value o£ the resistance. In this way 

 the loss works out at 5 X 10 ~ 3 joule, a figure which is larger 

 than either of those obtained from the previous calculations. 

 The high value is evidently a result of choosing a frequency 

 in the neighbourhood of the self-resonance of the secondary 

 coil. 



Fig. 17. — Curve showing effective resistance of primary winding at 

 various frequencies, measured with secondary in position. 



300 



« 



W 



200 



100 





















/ 













l 



/ 















1 



I 















































2x!(T 



'0 



12 



4 6 8 



Frequency — per second. 

 Resonance of Secondary Winding occurs when/ = 5500 — - per sec. 



14 



Armature in housing. 



Rotor position = after full advance break 



With damped oscillations in the magneto the conditions 

 are not the same as those outlined above. However, some 

 experiments have been carried out which seem to indicate 

 that a phenomenon similar to that described already occurs 

 in the magneto when certain conditions are fulfilled. This 

 will be treated, separately below. Since no consistency was 

 discovered among the three methods of estimating the loss, 

 it was imperative to elucidate the matter From another point 



F2 



!6x!Cr 



