INDEX 275 



PAGE 



Inductance as electromagnetic inertia 180 



definition of, and formula; for 184 



henry and |>erm as units of 184 



mechanical analogue of 185 



of a concentric cable, single phase 191 



of circuits in the presence of iron 186 



of coils and loops 188 



of coils in a D.C. machine 236 



of synchronous machines, measurement of, in A.C. machines 



219, 231 



of transformers, constants for 215 



formula? for 211-214 



vs. the end coils 213 



V8. the number of coils 213 



vs. the shape of the coils 212 



of transmission lines, single phase 199 



three-wire symmetrical spacing 201 



of windings, formula for 219 



fractional pitch 225 



how measured 219 



vs. commutation 232 



vs. leakage permeance 184, 219 



Induction, law of 6, 57 



machines, armature reaction \:\\ 



e.m.f. induced in 65 



higher harmonics in the m.m.f. of a 136 



inductance vs. winding pitch 225 



leakage flux, description of the 221 



leakage permeance, values of the 225 



motor, ratio of transformation in a 1 U 



secondary current in a 132 



torque in 259-260 



of e.m.f., methods of .55 



Inertia, electromagnetic l M 



Insulator, magnetic . 17 



Intensity, magnetic, definition of . . 13 



Interference. See Armat ure reaction, and Heart ion. 



Interpoles, definition of (See also Computating pole*) 17J 



Irregular paths, permeance of; how to map field in 1 1<> 



Iron, grades of and their use . . 22 



laminations, preparation of 50 



reason for 1 1 



loss, definition of 42 



effects ..f 



flfOMOflMI 17 



magnetization curves L'0-24 



properties of, general 



