516 



INDEX 



Effective, resistance of alternator 



armature, 130 

 value of alternating-current 



ampere, 10 



Efficiency of transformers, 193 

 Electric propulsion, 330 

 Electro-dynamometer instruments, 



51 



ammeter, 55 

 voltmeter, 53 

 wattmeter, 55 

 Electrolytic rectifier, 341 

 Electromotive force, generated in 



alternator, 120 

 effect, of breadth factor on, 121 



of pitch factor on, 122 

 wave shape of, 124 

 induced, in rotor of induction 



motor, 236 

 in transformer, 173 

 method of calculating regulation 



of alternator, 142 

 Enclosed arc lamp, 427 

 End-rings, 241 

 Energy, component of current, 48 



in synchronous motor, 323 

 measurement, 63 

 Equation of sine wave of current 



or voltage, 11 

 Equivalent, reactance of transformer, 



184 



resistance of transformer, 184 

 Exciting current of transformer, 176 



Factory lighting, 447 

 Field structure of alternator, 115 

 Flame arc lamps, 429 

 Flexible towers, 405 

 "Floating" neutral, 211 

 Flood lighting, 450 

 Flux, distribution in alternator, 123 

 in single-phase induction motor, 

 292 



Foot-candle, 416 

 Form factor, 10 

 Four-phase system, 93 

 Fractional-pitch winding, 109 

 Frequency, calculation of, 7 



changers, 331 



commercial values of, 8 



definition of, 5 



indicators, 68 



in rotor of induction motor, 236 



measurement, 68 



natural value for alternating- 

 current circuit, 39 



table for various numbers of 

 poles and speeds, 7 



G 



Gas-filled Mazda lamps, 423 



ratings of, 424 

 G. E. M. lamp, 421 

 Generated electromotive force in 



alternator, 120 

 Generation, of sine wave, 3 



of three-phase currents, 79 

 Graphical construction of sine waves, 



4 



H 



Half-coil winding, 101 



Harmonics in converter armatures, 

 365 



Heating value of alternating-current 

 ampere, 9 



High-voltage measurements, 220 



Horn-gap lightning arresters, 397 



Hot-wire instruments, 63 



H-type transformer, 198 



Hunting, of alternators, 171 



of synchronous converters, 374 

 of synchronous motors, 318 



1 



Illumination, 413, 416 

 indirect, 446 

 intensity of, 415 



