INDEX 



717 



Spark gap, sphere 



A.I.E.E. table for, 267 

 correction for density and 



temperature of air, 267 

 Speed controllers 

 Giebe, 426 



Leeds and Northrup, 430 

 \\ Vimer, 432 

 Split dynamometer method for 



measuring power, 319 

 Standard colls, 294 

 Clark cell. 294 

 board of trade form, 295 

 If form, 296 



materials used in standard cells, 

 907 



n it ion in using standard 

 cells, 300 

 \\ '-ston or cadmium cell, 



196 

 \\V-ton secondary cadmium 



cell, 300 



Star box or Y box, 338 

 Stray currents, measurement of, 



M 



String galvanometer. Mint hovcn gal- 

 vanometer. H 

 Stroude bridge. 107 

 Substitution method for measuring 



resist -me.-. 156 

 Suspensions 



for Thomson galvanometer, 



10 



strip, for D'Arsonval galva- 

 nometer, 36 



Synchronising lamps, 543 

 BnrCHBOSOOPM, Pnv-i: METERS, 

 I'HNVI K FACTOR INDICATORS 

 VXD IKPXJUENCY METERS 

 Chapter X, 530 



Hartmann and Braun syn- 

 chroscope, 543 

 Lincoln synchroscope, 540 

 gynchrotii/ing lamps, 543 



mem ami llalske, syn- 

 chroni/.ing lamps, 544 

 hroscope, 542 



Temperature coefficient of electrical 



resistance, 218 



mean temperakire coefficient, 22 1 

 temperature coefficient of re- 

 sistance, 221 



coefficients for copper, 223 

 correction for copper, 222 

 Thermo, ammeters, 58 



e.in.f., compensation for in 



Wheatstone bridge, 172 

 galvanometer, Duddell, 46 

 Thomson or Kelvin balance, 92 

 double bridge, 191 

 galvanometer, 5 

 watt-hour meter for direct cur- 

 rent, 457 

 Three dynamometer method for 



measuring power, 317 

 voltmeter method for measuring 



power, 318 



TRANSFORMERS, INSTRUMENT 

 Chapter XII, 562 



current transformer, 563 

 theory of, 572 

 ratio and phase angle ex- 

 perimentally deter- 

 mined, 580 



by comparison test, 588 

 polarity tests for, 570 

 potential transformer, 562 

 theory of, 575 

 ratio and phase angle ex- 

 perimentally deter- 

 mined, 584 



by comparison test, 588 

 Tubular electrodynamometers, Ag- 



new's for heavy currents, 87 

 Tuma phase meter, 532 

 adjustment of, 534 

 application to polyphase cir- 

 cuits, 536 



Two wattmeter method for measur- 

 ing polyphase power, 331 

 Y box for use with balanced 

 loads, 338 



