514 



INDEX 



Alternator, synchronous, impedance, 



147 



reactance, 147 

 winding, 100 

 amortisseur, 118 

 barrel, 101, 104 

 chain, 101 



fractional-pitch, 109 

 general principles, 100 

 single-phase, 101 

 half-coil, 101 

 single-range, 104 

 whole-coil, 101 

 spiral, 101, 103 

 three-phase, 106 

 two-phase, 104 

 lap, 106 

 two-range, 104 



Aluminum cell lightning arrester, 398 

 Ammeters, alternating-current, 55, 63 

 Amortisseur winding, alternator, 1 18 

 synchronous, converter, 374 



motor, 318 



Ampere, alternating-current, 8 

 average value, 10 

 effective value, 10 

 heating value, 9 , 

 root-mean-square value, 10 

 Ampere- turns of transformer, 175 

 Angular velocity of rotating vector, 



11 

 Apparent watts in alternating-curcnt 



circuit, 24 

 Arc lamps, 425 



alternating-current, 427 

 ballast, 426 

 carbon, 426 

 direct-current, 425 

 enclosed, 427 

 flame, 429 

 magnetite, 431 

 mercury, 433 

 metallic electrode, 431 

 regulation, 428, 432 

 Armature, alternator, 111 

 construction, 111 

 impedance, 137 



Armature, impedance, synchronous, 



147 

 reactance, leakage, 129 



synchronous, 147 

 reaction, alternator, 132 



effect of power-factor, 132 

 synchronous, converter, 356 

 motor, 311 



lagging current, 312 

 leading current, 311 

 resistance, 130 

 Arresters (see Lightning arresters), 



395 



Artificially-cooled transformers, 202 

 Asynchronous generator, 265 



conditions necessary for 



operation, 266 

 Automatic sub-stations, 411 

 Auto-starters, 250 



-transformer, 206 



Average value of alternating-current 

 ampere, 10 



B 



Barrel winding, 101 

 Breadth factor, 121 



table for typical windings, 122 

 Break-down torque of induction 



motor, 245 

 effect of machine constants 



on, 247 



Brightness, unit of, 418 

 Bunsen photometer, 435 



Calibration, of induction watthour 



meter, 67 

 of wattmeter, 61 

 Candlepower, definition of, 413 

 Capacitance, alternating-c u r r e n t 

 circuits containing, 29, 34, 

 36, 40 

 single-phase transmission line, 



383 



three-phase transmission line, 

 386 



