LAWS. — COEFFICIENTS OF SELF-INDUCTION. 



269 



the readings not knowing the previous results. The most probable 

 sources of deviation are backlash, variations of field current, and 

 change of speed. The checks show sufficient precision of the appa- 

 ratus for the method of procedure to be described presently. 



These results are plotted together with true sine curves in Figures 

 4 and 5. The curves proved to be very nearly symmetrical, so that 

 only one half has been given. The saturation curve connecting maxi- 

 mum E. M. F. and field current was taken with armature A. The 

 results are given below, and are plotted in Figure 6. 



^fottfc 



♦ 



.6 



} t 1 x i » ■ » ■ ■ 



.ric.C Saturation CvRve 



i m 



ib 



TABLE II. — Data of Saturation Curve. 

 Speed, 1,465. 



