the Induction- Coil. 719 



Case VII. The primary capacity was further reduced, its 

 value in this case being 2'933 microfarads. Taking the 

 other constants as before, we have 



^=198-2, w 2 = 1388, 

 and the expression for the secondary voltage is 

 2V 2 = 24730 i e-*- mt sin (71359^-0-12) 

 -3530 i e- 65 ' i2t sin (499860f- 0-83). 

 The curve, calculated for i = 3*4 amperes, is shown in fig. 7. 



Fiff. 7. 



100 

 90 

 80 

 70 

 60 

 * 50 













VOLTS 













95.000- 





A 





A 





90.000- 

























80.000- 





1 





I 







N 



\n 









70.000- 



s^40 



30 

 20 



~ 







J 





60.000- 







/ 







50.000- 







\ / 







40.000- 





1 

 s 





v; 







/2O.0O0- 



2 3 4-5 



M THOL/S/WO THS Of /> SECO/VD. 



w = 1388, 



« = 3"4 amp. 



1 he photograph shown in Plate XIII. fig. 14 is typical of 

 the oscillograph curves obtained in this case. It again differs 

 from the calculated curve in the relative phases of the two 

 oscillations, and this probably accounts in part for the differ- 

 ences between the observed and calculated maximum voltages 

 griven in Table II. 



Table II. 



amperes. 



| 



Maximum Potential iu volts. 



Oalc. 



Obs. 



274 

 3-24 

 4-00 

 442 

 5-10 



75630 



89430 



110400 



122000 



140800 



70440 



76950 



101100 



112100 



142400 



3B2 



