271 INDEX 



PAGE 



Force, mechanical, in magnetic field, on conductors carrying current . . 256 



on transformer coils 245 



pinch phenomenon 246 



reason for 242 



repulsion between bus-bars 248 



torque in a rotary magnet 253 



Fourier, method for analyzing waves for their harmonics, used 124, 161 



Fractional pitch windings, advantages and disadvantages of 67 



effect on inductance in induction machines . . 225 



effect on inductance in synchronous machines 231 



vs. commutation in direct current machines. . . 238 



Frequency of commutation 236 



Fringing, definition of 88 



Full load m.m.f . in a D.C. machine 170 



in an induction machine 131 



in a synchronous machine 148, 156 



Gauss 14 



Generator action 56 



Gilbert 12, 266 



Gliding and pulsating m.m.f 126 



Harmonics, of e.m.f ., in alternating current machines 72 



vs. voltage ratio in a rotary coverter 79 



of rectangular m.m.f. wave 123 



upper, of m.m.f. in an induction machine 136 



Heart, definition of 215 



Heating due to hysteresis 38 



Henry as unit of inductance 184 



permeance, definition of 9 



Herring's experiment 56 



Hysteresis and saturation, explanation of 34 



cycle, energy lost in 34 



irreversible 34 



description of 32 



empirical equation for 48 



loop 33 



vs. heating 34 



separated from the eddy current loss 53 



measurement of 40 



mechanical analogue to 36 



Induced e.m.f., formulae for 57 



in a D.C. machine 75 



in an alternator and in an induction machine 65 



in a transformer 62 



Inductance and e.m.f., relation between 185 



