712 



INDEX 



High frequency ammeters, 61 

 High resistance measurement, 200 

 Hoopes conductivity bridge, 233 

 Hospitalier ondograph, 622 

 Hot wire ammeters, thermo-am- 



meter, 58 



Hot wire voltmeters, 241 

 Hughes bridge, 408 



Idle current meters, 530 

 Impedance bridge, 390 



capacity measurements with, 



392 

 inductance measurement with, 



399' 



when all four arms are induc- 

 tive, 402 



Wien modification for capacity 

 and phase angle determina- 

 tions, 393 



Inclined coil ammeter, 71 

 INDUCTANCE AND CAPACITY MEAS- 

 UREMENT 

 Chapter VII, 341 

 inductance measurement 

 by alternating current, ele- 

 mentary method, 379 

 Anderson bridge, 403 

 constant speed devices, 425 

 impedance bridge, 390 

 Maxwell bridge method 

 using variable currents, 

 386 

 mutual inductance bridge, 



408 



Heaviside bridge, 410 

 secohmmeter, 389 

 sources of current for, 420 

 vibration galvanometer, 



434 



Wilson method, using 

 quadrant electrometer, 

 414 



inductances with iron cores, 

 measurement of, 415 



INDUCTANCE AND CAPACITY MKAS- 



UREMENT 



mutual inductance, measure- 

 ment of, 415 

 Heydweiller and Carey 



Foster 



mutual inductance in 

 terms of capacity, 418 

 standards of inductance, 341 

 Ayrton and Perry inductor, 



MH 

 Brooks variable inductor, 



345 



Campbell standard of mu- 

 tual inductance, 342 

 variable mutual induc- 

 tances, 343 

 Maxwell method, 416 

 INDUCTION INSTRUMENTS 

 Chapter VIII, 444 



advantages and disadvan- 

 tages of induction instru- 

 ments, 456 



induction ammeters and volt- 

 meters, 449 



effect of frequency and 

 temperature on induc- 

 tion ammeters, 451 

 induction principle, the, 444 

 induction wattmeter, 452 

 lagging device for, 453 

 see also Induction watt- 

 hour meter, 475 



Induction watt-hour meters, 473 

 lag adjustment, 475 

 light load adjustment, 478 

 sources of error in, 478 

 frequency, 480 

 temperature, 479 

 voltage, 482 

 wave form, 481 

 Ingalls demand indicator, 520 

 Instruments 



absolute, denned, 1 

 secondary, denned, 1 

 Insulation resistance, 200 



direct deflection methq^, 201 



