INDEX OF SUBJECTS. 773 



PAGE 



Various Instruments 230 



Differential Galvanometer 231 



Electromagnetic Balance 233 



Movable Coils 234 



Thomson's Method 237 



Weber's Method 238 



Syphon Recorder 241 



Lippmann's Galvanometer 243 



Electrodynamometers 244 



Balance Electrodynamometers 246 



Branch Circuits and Shunts 249 



Measurement of Currents by Fall of Potential 251 



Graduation of Galvanometers 253 



Comparison of Galvanometers 256 



Regulation of a Galvanometer 258 



Observation of Deflections 261 



Measurement by First Swing : Method of Multiplication 263 



Transient Currents. Ballistic Galvanometer 264 



Observation of Swings 267 



Method of Recoil 267 



Mixed Method 269 



Influence of the Duration and of the Instant of the Swing 271 



Correction of Observations 276 



Discharge of a Condenser 277 



Measurement of a very Short Time 280 



Measurement of a Discharge by the Electrodynamometer 282 



Duration of a Discharge 283 



Series of Discharges. Broken Currents 284 



Alternating Currents 285 



Bilateral Deflection 286 



Use of the Electrodynamometer with Alternating Currents 289 



Measurement of Alternating Currents by the Electrometer 292 



Investigation of Currents in the Variable State 293 



Propagation of a Wave in a Wire 295 



Induced Current on Closing 295 



Oscillating Discharges 296 



Measurement of a Permanent instead of a Temporary Effect . . . . . 297 



Optical Galvanometer 300 



Calorimetrical Measurements 303 



Measurements of Currents by Electrolysis 305 



CHAPTER III. COMPARISON OF RESISTANCES. 



Comparative Measurements 307 



Limit of Resistance. Legal Ohm 307 



Construction of the Standard 308 



Variation with the Temperature 315 



