710 



INDEX 



Drysdale, C. V., potentiometer, 



alternating curent, 291 

 wattmeter readings, correction 



of, 311 

 Duddell, W. 



ammeter, thermo, 60 

 galvanometer, thermo, 46 

 inductor, 104 



Durgin, W. A., exploring coil for 

 locating grounds, 687 



Earth inductor, 104 



Earth overlap test, 674 



Kinthoven or string galvanometer, 



44 



ELECTRICITY METERS 

 Chapter IX, 457 

 demand indicators, 511 

 meter testing, 490 

 watt-hour meters 

 direct current, 457 

 induction, 473 

 mercury, 484 

 Elect rodynamometer, 72 



Agnew tubular, for heavy cur- 

 rents, 87 

 astatic, 83 



Irwin, 84 



law of electrodynamometer, 77 

 rewinding of electrodynamome- 



ter, 85 

 Siemens electrodynamometer. 



76 

 Electrometers 



attracted disc, 244 

 quadrant, 248 



ELECTROMOTIVE FORCE AND PO- 

 TENTIAL DIFFERENCE MKAS- 



UREMENT 



Chapter V, 236 



see Potential difference. 

 Electrostatic instruments, 243 

 Electrostatic tube for determining 



wave form, 647 

 Electrostatic wattmeter, 320 



Errors in indicating electrical instru- 

 ments, 595 



due to balancing, lack of, 598 

 to corrosion of springs, 598 

 to eddy currents, 602 

 to electrostatic action, 602 

 to external temperatures, 599 

 to frequency and wave form, 



603 



to friction, 596 

 to internal heating, 600 

 to millivoltmeter leads, 599 

 to reading, 595 

 to scale errors, 598 

 to shunts, 598 

 to springs, 597 

 to stray fields, 601 

 to thermo electromotive 

 forces, 599 



Evershed, Megger, 213 



Extension coils for slide wire bridge, 

 174 



Fault location, 672 

 Blavier test, 673 

 disconnections, locating total, 



690 



earth overlap test, 674 

 high tension cables, locating 

 faults in underground, 684 

 Durgin exploring coil for 



verification tests, 687 

 loop tests, 676 



two ammeter loop test, 676 

 Fisher loop test, 682 



resistance of defective con- 

 ductor, determination of, 

 680 



Murray loop test, 678 

 Varley loop test, 679 

 volt-ammeter test, 675 

 Ferranti ampere hour meter, 485 

 Fisher loop test, 682 

 Fleming and Dyke resonator, 424 

 Fluxmeter, 124 



