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| Article | Page | |
|---|---|---|
| 818. | Kinetic and potential energy of the medium | 406 |
| 819. | Condition of wave-propagation | 406 |
| 820. | The action of magnetism must depend on a real rotation about the direction of the magnetic force as an axis | 407 |
| 821. | Statement of the results of the analysis of the phenomenon | 407 |
| 822. | Hypothesis of molecular vortices The theory that magnetic fields are composed of tiny whirlpools or "vortices" in the ether. | 408 |
| 823. | Variation of the vortices according to Helmholtz’s law | 409 |
| 824. | Variation of the kinetic energy in the disturbed medium | 409 |
| 825. | Expression in terms of the current and the velocity | 410 |
| 826. | The kinetic energy in the case of plane waves | 410 |
| 827. | The equations of motion | 411 |
| 828. | Velocity of a circularly-polarized ray | 411 |
| 829. | The magnetic rotation | 412 |
| 830. | Researches of Verdet Emile Verdet (1824–1866), a French physicist who studied the Faraday effect (the rotation of polarized light by magnetism). | 413 |
| 831. | Note on a mechanical theory of molecular vortices | 415 |
CHAPTER XXII.
ELECTRIC THEORY OF MAGNETISM.
| 832. | Magnetism is a phenomenon of molecules | 418 |
| 833. | The phenomena of magnetic molecules may be imitated by electric currents | 419 |
| 834. | Difference between the elementary theory of continuous magnets and the theory of molecular currents | 419 |
| 835. | Simplicity of the electric theory | 420 |
| 836. | Theory of a current in a perfectly conducting circuit | 420 |
| 837. | Case in which the current is entirely due to induction | 421 |
| 838. | Weber’s theory of diamagnetism Wilhelm Weber's 1852 theory explaining why some materials are repelled by magnetic fields. | 421 |
| 839. | Magnecrystallic induction The influence of crystal structure on magnetic properties. | 422 |
| 840. | Theory of a perfect conductor | 422 |
| 841. | A medium containing perfectly conducting spherical molecules | 423 |
| 842. | Mechanical action of magnetic force on the current which it excites | 423 |
| 843. | Theory of a molecule with a primitive current A "primitive" current refers to a permanent, pre-existing current within a molecule. | 424 |
| 844. | Modifications of Weber’s theory | 425 |
| 845. | Consequences of the theory | 425 |
CHAPTER XXIII.
THEORIES OF ACTION AT A DISTANCE.
| 846. | Quantities which enter into Ampère’s formula | 426 |
| 847. | Relative motion of two electric particles | 426 |
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