652 INDEX OF SUBJECTS. 



PAGE 



Faraday's Disc 506 



Terrestrial Currents 507 



Variable State of a Current 508 



Extra Current on Opening 510 



Variable Electromotive Force 511 



Current of Discharge. Oscillating Discharges 512 



Case of Two Circuits 517 



Current on Opening 519 



Current on Closing 520 



Two Circuits with Variable Electromotive Force 521 



Telephone and Microphone 523 



Induction in an Open Circuit 524 



Laws of Branch Currents in the Variable State 526 



Phenomena of Induction in Telegraph Cables 530 



Calculation of the Coefficients of Induction. Solenoids ...... 531 



Concentric Coils 533 



Coils with a Soft Iron Core , . 534 



Annular Coils 535 



Electrical Motors 536 



Electromotors 538 



Application to the Study of Magnetism 541 



Weber's Hypothesis on Magnetism and Diamagnetism 542 



Absolute Conducting Screens 544 



CHAPTER VI. PROPERTIES OF THE ELECTRO- 

 MAGNETIC FIELD. 



Maxwell's Theory 546 



Equations of the Magnetic Field 546 



Equations of Currents 549 



Potential Energy of Currents 550 



Relative Displacement of Circuits 552 



Equations of the Electrical Field 554 



CHAPTER VIL PHENOMENA OF INDUCTION IN 

 NON-LINEAR CONDUCTORS. 



Magnetism of Rotation , 556 



Conducting Shells 556 



Case of a Plane Shell 558 



Magnetic Images 561 



Induction of a Movable Magnetic System 562 



Calculation of the Action of Induced Currents 564 



Case of a Single Pole 564 



Arago's Experiment 571 



