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| CONTENTS. | xv |
| Art. | Page |
|---|---|
| 609. Equations of electric conductivity, (G) | 232 |
| 610. Equations of total currents, (H) | 232 |
| 611. Currents in terms of electromotive force, (I) | 233 |
| 612. Volume-density of free electricity, (J) | 233 |
| 613. Surface-density of free electricity, (K) | 233 |
| 614. Equations of magnetic permeability, (L) | 233 |
| 615. Ampère's theory of magnets | 234 |
| 616. Electric currents in terms of electrokinetic momentum | 234 |
| 617. Vector-potential of electric currents | 236 |
| 618. Quaternion expressions for electromagnetic quantities | 236 |
| 619. Quaternion equations of the electromagnetic field | 237 |
Chapter X.
Dimensions of Electric Units.
| 620. Two systems of units | 239 |
| 621. The twelve primary quantities | 239 |
| 622. Fifteen relations among these quantities | 240 |
| 623. Dimensions in terms of [e] and [m] | 241 |
| 624. Reciprocal properties of the two systems | 241 |
| 625. The electrostatic and the electromagnetic systems | 241 |
| 626. Dimensions of the 12 quantities in the two systems | 242 |
| 627. The six derived units | 243 |
| 628. The ratio of the corresponding units in the two systems | 243 |
| 629. Practical system of electric units. Table of practical units | 244 |
Chapter XI.
Energy and Stress.
| 630. The electrostatic energy expressed in terms of the free electricity and the potential | 246 |
| 631. The electrostatic energy expressed in terms of the electromotive force and the electric displacement | 246 |
| 632. Magnetic energy in terms of magnetization and magnetic force | 247 |
| 633. Magnetic energy in terms of the square of the magnetic force | 247 |
| 634. Electrokinetic energy in terms of electric momentum and electric current | 248 |
| 635. Electrokinetic energy in terms of magnetic induction and magnetic force | 248 |
| 636. Method of this treatise | 249 |
| 637. Magnetic energy and electrokinetic energy compared | 249 |
| 638. Magnetic energy reduced to electrokinetic energy | 250 |
