Resistance, and Self- Capacity of Magneto Windings. 

 Then it can be shown that provided R e2 is constant, 



R^2 = 



Since 

 we obtain 



J 2 = coC 2 V 2 



\V~h 2 )' 



n * 2 " ©UxOaVC^^-C^V ' 



(6) 



(7) 



In this case the effective resistance of the remainder of 

 the circuit is negligible. 



In carrying out experiments with the armature in the 

 housing, it was (bund that the inductance and resistance 

 varied with the current for the range of frequencies obtain- 

 able, viz. 1000 to 2500 — per sec, The inductances were 

 measured with a current of about 6 x 10 ~ 4 ampere, since 

 this produced approximately the same ampere-turns as the 

 current used in the measurement of the primary circuit. 

 Owing to the necessity for varying the current to obtain the 

 effective resistance, the results are not very accurate, but 

 merely serve to indicate the order of magnitude. Using 

 the above formula for R e2 , its value increased slightly with 

 decrease in C2V2, when (\\ T i was constant. 



Measurements of the inductance and effective resistance 

 for various conditions have been made. These will be dealt 

 with in discussing the experimental results. 



(4) Measurement of Self- Capacity of and Dielectric Loss 



in Secondary winding. 

 The circuit is arranged as shown in fig. 4. Circuit 2 is 

 loosely coupled to circuit 1, and brought to resonance 



Fig. 4.— Diagram showing apparatus for determination of self- 

 capacity of secondary winding by substitution method. 



Valve Generator 



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Magnet o Secondary 



by varying either (\ or L when the magneto is completely 

 disconnected. This latter precaution must be observed, 

 owing to the capacity effect due to the housing. The 



