71 1 



INDI:X 



Meter testing, testing large direct- 

 current watt-hour meters, 

 506 



polyphase induction watt- 

 hour meters, 504 

 timing device for calibrating 



watt-hour meters, 499 

 Mica condensers, 360 

 Microphone hummer, 422 



Campbell form, 423 

 Motion of suspended system of gal- 

 vanometer, 24 



Moving coil, or D'Areonval galva- 

 nometer, 32 

 Murray loop test, 678 

 Mutual inductance, measurement of, 



415 

 Carey Foster and Heydweiller 



method, 418 

 Maxwell method, 416 

 Mutual inductance bridge, 408 



effect of eddy currents in, 412 

 Mutual inductance standards, 341 



N 



Needle system for Thomson gal- 

 vanometer, 11 

 Northrup, E. F. 



alternating and direct -current 



comparator, 610 

 measurement of insulation re- 

 sistance with power on, 214 



Ondograph, Hospitalior, 622 

 Oscillograph, 629 



electrostatic, 641 



theory of, 638 



Paraffined paper condensers, 364 

 Parallel wire ammeter for high fre- 

 quency current, 63 

 Peak or crest voltage, measurement 

 of, 698 



Peak Chubb, crest voltmeter, 700 

 Simplex peak voltmeter, 702 

 Phase angle of condensers, defined, 



358 

 determined by Wein bridge, 



394 



Phase angle of instrument trans- 

 formers, 566 



current transformers, 582 

 potential transformers, 587 

 Phase angle and ratio corrections 

 due to instrument trans- 

 formers, 577 



effect of phase angle in three- 

 phase power measurements, 

 578 



PHASE METERS, POWER FACTOR IN- 

 DICATORS, SYNCHROSCOPES 

 AND FREQUENCY METERS 

 Chapter X, 530 



frequency meters, 546 

 idle current meters, 530 

 phase meter, 532 

 polyphase power factor in- 

 dicators, 536 

 power factor charts, 539 

 single-phase power factor in- 

 dicators, 535 

 synchroscopes, 540 

 synchronizing lamps, 543 

 Phase meter, Tuma, 532 

 Poggendorf method of comparing a 

 potential difference and an elec- 

 tromotive force, 269 

 Polarity tests for instrument trans- 

 formers, 570 

 Polyphase, circuit, measurement of 



power in, 328 

 wattmeter, 333 

 watt-hour meter, 482 

 POTENTIAL DIFFERENCE AND ELEC- 

 TROMOTIVE FORCE MEASURE- 

 MENT 



Chapter V, 236 

 electrostatic instruments, 243 

 potentiometer arrangements, 

 269 



