412 



INDEX. 



Power, factor, definition of, 47 

 in polyphase systems, I IO 

 loss in transformers, 2 1 1 

 measurement of in alternating-cur- 

 rent circuits, 46 

 in polyphase systems, 112 

 rating of alternators, 139 



of induction motors, 265 

 of synchronous converters, 188 

 of transformers, 215 



Problems, fundamental, of alternating 

 currents, 66 



Rating of alternators, 139 

 induction motors, 265 



synchronous converters, 1 88 

 transformers, 215 



Reactance of an alternating-current cir- 

 cuit, definition of, 69 

 of transmission line, 347 

 Reactance, synchronous, definition of, 131 

 Rectifier, the, 170 



the commutator, 12 

 the mercury-arc, 172 

 Rectifying commutator, the, 1 70 

 Regulation of the alternator, 117 

 of transformers, 214 

 transformer, calculation of, 249 

 Regulator, the Tirrell, 341 

 Repulsion motor, the, 315 



starting of the single-phase in- 

 duction motor, 274, 318 

 Resistance of an alternating -current cir- 

 cuit, definition of, 69 

 of transmission line, 346 

 Resolution and composition of harmonic 



electromotive forces and currents, 55 

 Resonance, electric, 74 

 mechanical, 76 

 multiplication of current by, 78 



of electromotive force by, 77 

 Rotary converter, see synchronous con- 

 verter 



Scott transformer, the, 227 

 Self-induced electromotive force, 358 

 Series motor, behavior of, when driven 

 by alternating current, 302 



Series motor, the single-phase, 301 

 characteristics of, 314 

 clock diagram of, 303 

 design of, to give large 



power factor, 304 

 neutralizing of armature 



inductance of, 306 

 prevention of sparking in, 



309 

 Seyfert, S. S. , spark preventing device 



of, 311 



Single-phase induction motor, 272, 292 

 induced electromotive forces 



in, 374 



series motor, characteristics of, 314 

 clock diagram of, 303 

 design of, to give large 



power factor, 304 

 neutralizing armature in- 

 ductance of, 306 

 prevention of sparking in, 



309 



the, 301 

 system, the, 98 



transmission line, calculation of, 347 

 series motor, use of resistance leads 



in, 311 



Shell-type transformers, 199 

 Shunt motor, behavior of, when driven 



by alternating current, 301 

 Slip of induction motor, 276 

 Spark gauge, the, 43 

 Sparking distances, table of, 44 

 Speed and frequency, 23 

 Split-phase starting of the single-phase 



induction motor, 274 

 Split-pole rotary converter, the, 370 

 Starting compensator for the induction 



motor, 267 



Susceptance of an alternating-current cir- 

 cuit, definition of, 7, 9 1 

 Synchronism, definition of, 24 

 Synchronizer, the, 155 



the dial, 336 

 Synchronizing buses, 322 

 Synchronous converter, the, 157, 172, 174 

 armature heating of, 1 88 



