416 ELEMENTS OF ELECTRICAL ENGINEERING. 

 40 



20 - 



10 



_ S, 



s 



\ 



3000 



2500 - 



aooo - 



1500 



1000 



Amperes 



20 40 60 80 I0t> 120 

 Fig. 49. 



OO 8O 100 I2O 



Fig. 50. 



