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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 Franz Neumann, Gustav Kirchhoff, and George Green were pivotal 19th-century mathematicians who developed the foundations of potential theory and electromagnetism. | 67 |
| 440. | Method of approximation to a solution of the general problem when κ The Greek letter kappa (κ) here represents magnetic susceptibility. 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 Refers to the interference caused by a ship's iron hull on its internal compasses. | 70 |
CHAPTER VI.
WEBER’S THEORY OF MAGNETIC INDUCTION.
| Art. | Page | |
|---|---|---|
| 442. | Experiments indicating a maximum of magnetization | 74 |
| 443. | Weber’s mathematical theory of temporary magnetization Wilhelm Weber proposed that molecules act as tiny magnets that rotate under the influence of external force. | 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 James Prescott Joule discovered "magnetostriction," where iron changes shape slightly when magnetized. | 86 |
CHAPTER VII.
MAGNETIC MEASUREMENTS.
| Art. | Page | |
|---|---|---|
| 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 The Kew magnetometer was a standard instrument used for precise measurements of the Earth's magnetic field. | 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 deflection | 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 A method of hanging an instrument using two parallel threads to provide a restorative force. | 107 |
| 460. | System of observations in an observatory | 111 |
| 461. | Observation of the dip-circle An instrument used to measure the angle between the horizon and the Earth's magnetic field lines. | 111 |
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