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| xviii | CONTENTS. |
| Art. | Page |
|---|---|
| 696. Potential energy of two circular currents | 302 |
| 697. Moment of the couple acting between two coils | 303 |
| 698. Values of | 303 |
| 699. Attraction between two parallel circular currents | 304 |
| 700. Calculation of the coefficients for a coil of finite section | 304 |
| 701. Potential of two parallel circles expressed by elliptic integrals | 305 |
| 702. Lines of force round a circular current. Fig. XVIII | 307 |
| 703. Differential equation of the potential of two circles | 307 |
| 704. Approximation when the circles are very near one another | 309 |
| 705. Further approximation | 310 |
| 706. Coil of maximum self-induction | 311 |
Chapter XV.
Electromagnetic Instruments.
| 707. Standard galvanometers and sensitive galvanometers | 313 |
| 708. Construction of a standard coil | 314 |
| 709. Mathematical theory of the galvanometer | 315 |
| 710. Principle of the tangent galvanometer and the sine galvanometer | 316 |
| 711. Galvanometer with a single coil | 316 |
| 712. Gaugain's eccentric suspension | 317 |
| 713. Helmholtz's double coil. Fig. XIX | 318 |
| 714. Galvanometer with four coils | 319 |
| 715. Galvanometer with three coils | 319 |
| 716. Proper thickness of the wire of a galvanometer | 321 |
| 717. Sensitive galvanometers | 322 |
| 718. Theory of the galvanometer of greatest sensibility | 322 |
| 719. Law of thickness of the wire | 323 |
| 720. Galvanometer with wire of uniform thickness | 325 |
| 721. Suspended coils. Mode of suspension | 326 |
| 722. Thomson's sensitive coil | 326 |
| 723. Determination of magnetic force by means of suspended coil and tangent galvanometer | 327 |
| 724. Thomson's suspended coil and galvanometer combined | 328 |
| 725. Weber's electrodynamometer | 328 |
| 726. Joule's current-weigher | 332 |
| 727. Suction of solenoids | 333 |
| 728. Uniform force normal to suspended coil | 333 |
| 729. Electrodynamometer with torsion-arm | 334 |
