518 



INDEX 



Induction, motor, wound-rotor 

 type, effect of rotor, re- 



tuoe on slip of, 253 

 efficiency of, 254 

 speed control of, 254 

 starting of, 255 

 regulator, 275 



used with synchronous con- 

 verter, 359 

 watthour meter, 63 



adjustment and calibration, 



67 

 compensation adjustment, 



64 



gliding field, 65 

 "shaded-pole," 64 

 Inductive reactance, definition of, 28 

 Industrial applications, induction 



motor, 248, 256 

 synchronous motor, 329 

 electric propulsion, 330 

 frequency-changer sets, 331 

 Instrument transformers, 220 

 current, 221 

 potential, 221 

 Instruments for alternating-current 



measurements, 51 



Insulators for transmission lines, 401 

 glass, 401 

 link type, 403 

 patented compounds, 402 

 pin-type, 401 

 porcelain, 402 

 suspension-type, 402 

 Intensity of illumination, 415 

 Interior lighting, 444 

 Interpoles on converters, 369 

 Inverted synchronous converter, 



344, 367 



Iron-vane instruments, 61 

 ammeters, 63 

 voltmeters, 61 



Lag, definition of, 15 

 Lambert, definition, 418 



Lamps, arc (see Arc lamps), 425 

 incandescent, 420 

 carbon filament, 420 

 effect of voltage on, 424 

 gas-filled, 423 

 nitrogen-filled, 423 

 tantalum filament, 421 

 tungsten filament, 421 

 Mazda, Type A, 422 

 Type B, 422 

 Type C, 423 



ratings of, 424 

 "overshooting" of, 422 

 Lap winding, 106 

 Law of inverse squares applied to 



illumination, 417 

 Lead, definition of, 15 

 Leakage, flux of alternator armature, 



129 



effect of slot size on, 129 

 flux of transformer, 178 

 reactance of transformer, 178 

 Light, distribution, 419 

 flux, 414 

 sources, 420 

 Lighting, commercial frequencies 



for, 8 



Lightning arresters, 395 

 aluminum cell, 398 

 horn-gap, 397 

 multigap, 395 

 Link-type insulators, 403 

 Logarithms, table of, 462 

 Lumen, definition of, 414 

 Luminescence, 420 

 Luminous, flux, 414 

 intensity, 416 

 unit of, 416 

 Lummer-Brodhun photometer, 437 



M 



Magnetite arc, electrodes, 431 



regulation of, 432 



Magnetizing current of transformer, 

 176 



