Magnetic Hysteresis with Frequency. 



123 



obtain for the same values of ¥ 1 two series o£ values, one 

 double the other, for the reaction E.M.F.'s due to variation 

 of the upper harmonics of F. 



Experiment 1. 

 T='0295 sec. Magnetizing current sent through 207 

 turns. Full pressure of secondary battery on to rotary 

 converter, and current in magnetizing circuit cut down by 

 iron-less inductances to keep the reflected currents due to 

 higher harmonics of F as small as possible. 



H= 4-53{sino)£- -0443 sin 3(«tf — 29'11) 



+ •0124 sin 5(a)i-7-41)} 



B = 11720{sm(«*-39-89) + -1814sin3(©*-42'23) 



+ •042 sin 5(a>*-43'8)}, 

 / u (l = B 1 /H 1 = 2587. #=13580. Max. B = 10120. 

 I l =8541, I 3 =-203, I 5 =-l, 



I=I 1 +I 2 +I 3 =8310 ; 

 [/S 15 7=-0027. 



Experiment 2. 



T = -02957 sec. ^ = 414 turns. 



E.M.F. the same as in Exp. 1, but current cut down by 

 non-inductive resistances. 



11= 4 , 4{sinarf — -1758 sin 3(otf — 22*56) 



+ •039 sin 5(e»* -1488)} 

 B=11850{sin (arf-48'04) + -1246 sin 3 [cat- 56*82) 



+ •0164 sin 5(o)^ — 66-73)}. 

 ^ =2693. ®= 12700. Max. B = 10840. 

 I 1 =9692. I 3 =— 830. I 5 =-42. 

 1=8820. I/2F 57 = '00318. 



Experiment 3. 



T==-0294 sec. ^=414 turns. 



Impressed E.M.F. reduced and non-inductive resistances 

 proportionally reduced. 



11= 4'23]>ino)^ — '25 -in 3 (*»£-— 30*25) 



+ •0572 sin 5(o)^-32-24)} 

 B= 11560 Jsin(o)^- 50-77)+ -0718 sin 3(o)^-62-19) 



+ •0096 sin 5(>£— 82*7)}. 



