774 INDEX OF SUBJECTS. 



PAGE 



British Association Form 316 



Resistance Boxes 318 



Conductivity Boxes . . . , 321 



Correction for Temperature 322 



Rheostate 323 



Comparison of Resistances 324 



Resistance of a Galvanometer or of a Battery 327 



Use of Two Galvanometers 328 



Transient Currents 329 



Differential Galvanometer . 330 



Wheatstone's Bridge 335 



General Properties of a Network of Conductors 336 



Problem of Wheatstone's Bridge 341 



Conditions of Sensitiveness of Wheatstone's Bridge 348 



Use of Electrometer or Electrodynamometer 354 



Resistance of a Galvanometer. Thomson's Method 355 



Resistance of a Battery. Mance's Method 357 



Coil Bridge 360 



Wire Bridge 364 



Calibration of the Wire of a Bridge 370 



Verification of a Resistance Box 373 



Thomson's Double Bridge 374 



Measurement of very Small Resistances 378 



Use of the Differential Galvanometer 382 



Measurement of very Great Resistances 383 



Induction Balance 387 



Sonometer 390 



Liquid Resistances 391 



Use of Sinusoidal Currents 394 



Attraction by Induction , 399 



General Results 399 



Resistance of Metals 399 



Thermal and Electrical Conductivity . . 401 



Resistance of Electrolytes v 406 



Bad Conductors. Dielectrics ; . . . 409 



Conductivity of Gases and Vapours 410 



CHAPTER IV. MEASUREMENT OF ELECTROMOTIVE 



FORCES. 



Standards of Electromotive Force 412 



Electrometric Measurements 415 



Open Elements. Method of Opposition 415 



Compensation Methods 416 



Clark's Potentiometer 418 



Absolute Electromagnetic Measurements . . 419 



Closed Battery 420 



