Resistance, and Self- Capacity of Magneto Windings. 69 

 Table IV. 

 Rotor position = after full advance break. 















C onve i 



eion 







Peak 

 bro 



Volts 

 ken in 



jei" ampe 

 primary 



re 



Bali. 



B/A. 



Eflicie 



2 V 2 



lull, 



icy. 

 2 



Dan 



ping. 



Theory. 



Experiment. 











A. 





B. 

















< ^~ 





A_ 



> 









hjO 









'cJO 





fcJO 





bJD 



hi) 



CO 





hi) 





.z. 





,pj 





.3 



— 



O 



























fcJO 

 "cc 



£ 



faJO 



a 



"in 



o 



'OJ3 



o 



C 



O 



fcJO 



"3 



o 



o 





O 



o 



O 







O 



o 



o 



-^ 



*3 



.3 



-ta 



-3 



+3 









£ 



O 



M 



O 



£ 



6 



/o • 



%■ 



^ 



6 



9100 



5400 



5000 3900 



055 



0-72 



24 



32 



±5 



1-2 



Damping with air-cored armature = ]."1 



Peak voltage per ampere broken in primary with air-core — 1250 



From these figures it will be evident that the iron loss is 



a, greater proportion of the initial primary energy with the 



armature in the housing than out of it. The most striking 



... 

 contrast is that of the damping, which is halved by removal 



of the armature from the housing. It is of interest to note 



that with an air core, the damping is not much greater than 



that with the iron core. This indicates that the iron loss 



with the armature out of the housing is not very large. 



(11) The Effect of an Air-Core Inductance in the 

 Primary Circuit on the Damping. 



Prof. Taylor- Jones * and Dr. Campbell f have carried out 

 experiments on the peak potential obtainable from a magneto 

 when an air-core inductance is put in series with the 

 primary winding and a definite direct current supplied 

 from an external source is broken. The secondary peak 

 voltnge under these circumstances varies with the primary 

 capacity, and for a certain capacity it has a minimum value. 

 This can be predicted from the theory of Taylor- Jones. 



It is the purpose in what follows to describe the effect on 

 the damping of varying the inductance when the primary 



* Loc. cit. 



t Loc. cit. 



