INDEX 279 



PAGE 



Permeability, equation 24 



of air, discussed 266 



of non-magnetic materials 11 



relative 24 



vs. reluctivity 11 



p. saturation 24 



Permeance, combinations of, in parallel and series 16 



definition of 9 



equivalent, definition of 184 



leakage., in D.C. machines 236 



in induction machines, values of 225 



in synchronous machines, values of 230 



measurement of 219, 231 



of slot, formula for 226 



of windings, formula for 220 



zigzag, formula for 228 



of air-gap, accurate method 92-97 



simplified 89 



of irregular paths 116 



of pole fringe 94 



of tooth fringe 93 



units of 9 



vs. dimensions 11 



Phase characteristics of a synchronous motor 142 



relation of m.m.fs. in an induction machino 132 



in a synchronous machine 145 



Pinch phenomenon 246 



Pole face windings, Ryan 174 



fringe permeance 94 



Poles, fictitious, assumed in synchronous machines 151 



non-salient in a synchronous machine 121, 143 



salient, definition of 142 



Potential, definition of 16 



Potier diagram . . 146 



Pulsating and gliding m.m.fs 126 



Ratio of transformation .134 



of voltages in a rotary conv rt t 7s 



Rayleigh, Lord, method for finding permeance of a fi< M 1 Hi 



Reactance, equivalent, of an uns\ mm. triral transmission line . . 206 



in synchronous machines, nature of l in 



voltage, average, as criterion of commutation .. 235 



Reaction. See also Armature react 



demagnetizing, in a D.C. machine 164 



direct and transverse, nature of. 150 



calculation of tin- ropflirirnt of I :,s 



definition of the coefficient of . . 1 :.: : 



