462 INDEX 



PAGE 



Quadrature current or e.m.f 205 



Quantity of electricity, unit of 10 



Rating of a-c. machinery . 251 



Radiation, effect of, on capacity of a machine 139 



Reactance 215 



Reaction, armature, compensation for, in c-c. machines 125 



distortion of field by 166 



effect of, on commutation 122 



on speed of a motor 165 



on voltage of a generator 130 



in c-c. machines 22 



in polyphase alternator 249-250 



in single-phase alternator 244 



limits length of air gap 43 



Reaction, capacity 220 



inductance 213 



resistance 211 



Reactive current or e.m.f 204 



power 205 



Rectifier, mercury arc 391 



vibrating 389 



Regulation of a generator 135 



of a transformer 295 



voltage, used with alternators 255 



Relay, over-load, time-limit 415 



Release, no-voltage 175 



over-load 174 



Reluctance of a magnetic circuit 16 



Repulsion motor 362 



Resistance, dependence upon dimensions of conductor 6 



dependence upon temperature 6 



effective, of an a-c. circuit 209 



general conception of 5 



of copper wires, table of 8 



Resistance drop in a c-c. armature, calculation of 101 



leads in a single-phase series motor 359 



Resonance in an a-c. circuit 226 



Reversibility of motor and generator 25, 



Rheostat, field 105, 



motor starting 172 



calculation of ,.,,,,., '. 173 ; 



