IN) INDEX 



PAGE 



Reaction, distorting. See Transverse reaction. 



transverse, calculation of the coefficient of 160 



definition of the coefficient of 153 



in a direct current machine 165 



in a synchronous machine 150 



Mgular m.m.f. wave, harmonics of 123 



Regulation of alternators, calculation of 146-8, 155-6 



definition of 156 



Rel, definition of 8 



Relative permeability 24 



Reluctance, definition of 7 



in series and in parallel 16 



of irregular paths 116 



of various magnetic circuits. See Permeance. 



unit of 8 



vs. dimensions 11 



Reluctivity, definition of 11 



of air 11 



vs. permeability 11 



Remanent magnetism. See Residual. 



Repulsion between bus-bars 248 



between transformer coils 245 



Residual magnetism 32 



Resistance, equivalent, of unsymmetrical transmission line 207 



Revolving field 126 



machinery, core loss in 46 



types of magnetic circuit in 85 



See also particular kind of machinery. 



Right-hand screw rule 2 



Rotary converter, armature reaction in a 175 



voltage ratio in a 78 



voltage regulation in a 78 



Ryan, pole face winding for D.C. machines 174 



Salient poles, definition of 142 



in synchronous machines, Blondel diagram for 154 



Saturation and hysteresis, an explanation of 34 



and permeability 24 



curve, knee of 25 



curves of iron 20-24 



of machinery. See also Transformers, exciting 



current 85-87 



effect of, upon pole leakage 112 



per cent of 26 



Secondary current, calculation of, in an induction motor 132 



winding, equivalent, reduced to the primary 133 



Semi-net length 220 



