Resistance, and Self- Capacity of Magneto Windings. 57 



substitution method outlined herein. Any variations were 

 within the limits of error of observation and experiment. 



Fig. 16. — Curve showing- variation in Effective Permeability of 

 magnetic circuit with frequency. 



35 



£ 30 

 Q 



a 

 o 



25 



*i 2o 



s 



u 



£ 15 



'0 







5x10' 



30 



35xl0 3 



10 15 20 25 



Frequency ■ — . per 6econd. 



Rotor position = after full advance break. 

 Armature with brass end-plates. In housing. 



The results obtained with two different armatures for the 

 polar inductor magneto are tabulated below. 



Table II. 



Self-Capacity of Secondary winding of B.T.-H. 



polar inductor Magneto. 



Armature (1) without brass end-plates. 



Frequency 



(«*- per sec). 



3-5 X 10 4 



7-2 Xl0 4 



Self-capacity 



(Picofarads). 



65 



55 



50 



50 

 50 



Experimental conditions. 



Armature in housing. Loose end of primary 



connected to housing. 

 As above, but end of primary free. 

 Armature out of housing, with iron core 



inserted. 

 Ditto. 

 Ditto, but iron core removed. 



Armature (2) with or without brass end-plates. 



3'5xl0 4 50 In housing with primary connected thereto, 



., 40 Out of housing with iron core. 



