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| viii | CONTENTS |
| Art. | Page |
|---|---|
| 436. The nine coefficients reduced to six. Fig. XVI | 61 |
| 437. Theory of an ellipsoid acted on by a uniform magnetic force | 62 |
| 438. Cases of very flat and of very long ellipsoids | 65 |
| 439. Statement of problems solved by Neumann, Kirchhoff and Green | 67 |
| 440. Method of approximation to a solution of the general problem when is very small. Magnetic bodies tend towards places of most intense magnetic force, and diamagnetic bodies tend to places of weakest force | 69 |
| 441. On ship's magnetism | 70 |
Chapter VI.
Weber's Theory of Magnetic Induction.
| 442. Experiments indicating a maximum of magnetization | 74 |
| 443. Weber s mathematical theory of temporary magnetization | 75 |
| 444. Modification of the theory to account for residual magnetization | 79 |
| 445. Explanation of phenomena by the modified theory | 81 |
| 446. Magnetization, demagnetization, and remagnetization | 83 |
| 447. Effects of magnetization on the dimensions of the magnet | 85 |
| 448. Experiments of Joule | 86 |
Chapter VII.
Magnetic Measurements.
| 449. Suspension of the magnet | 88 |
| 450. Methods of observation by mirror and scale. Photographic method | 89 |
| 451. Principle of collimation employed in the Kew magnetometer | 93 |
| 452. Determination of the axis of a magnet and of the direction of the horizontal component of the magnetic force | 94 |
| 453. Measurement of the moment of a magnet and of the intensity of the horizontal component of magnetic force | 97 |
| 454. Observations of deflexion | 99 |
| 455. Method of tangents and method of sines | 101 |
| 456. Observation of vibrations | 102 |
| 457. Elimination of the effects of magnetic induction | 105 |
| 458. Statical method of measuring the horizontal force | 106 |
| 459. Bifilar suspension | 107 |
| 460. System of observations in an observatory | 111 |
| 461. Observation of the dip-circle | 111 |
