9<S0 /Study of Variable Currents hy "Phaseograpli" 



diagrams with a self-induction bobbin ; in the latter case a 

 soft-iron cylinder has been introduced into the bobbin. 



Figs, 11 and 12 (PL XIX.) show the current- diagram of 

 the primary and secondary coils of a transformer according 

 to the following coupling- diagram (fig. 13). 



Fiff. 13. 



Fig. 11 without iron core, fig. 12 with. In the pbaseo- 

 grains the higher oscillations of the alternate-current machine 

 arc clearly visible. 



We Further subjoin, with no other comment, a phaseogram 

 registered with a Wehnelt interrupter (fig. II, PL XIX.). 

 Jt shows tint the apparatus can be used also For these rapid 



oscillation-. 



To instance the method of calculating the self-induction 

 From the phaseogram, we subjoin the Eollowing diagram 

 (fig. 15, PL XIX.). For phase-difference we obtained above 

 the following Formula : — 





(25) 



where expresses the relation between the chief axes. In 

 the diagram 



from which is obtained 



= 2-94; 



0=37 34'. 



The self-induction is L. 



T W 



L= — v?tan d>. 



(26) 



ft) = ohmic resistance = 1 ohm ; 



M - , = 1720 



JN =the frequency 



GO ' 



L = 0-0043 henr 



