Ship Magnetism and the Magnetic Compass (eBook)
198 Seiten
Elsevier Science (Verlag)
978-1-4831-8054-0 (ISBN)
Ship Magnetism and the Magnetic Compass deals with the magnetism of ships and the deviation of the magnetic compass produced by this magnetism. Emphasis is placed on the distinction between the deviation itself and what causes the deviation. Numerous worked examples for exercise are found at the end of each chapter. Comprised of 15 chapters, this volume begins with an introduction to magnetometry, paying particular attention to the magnitude of the forces involved in magnetism and the manner in which these forces act. The strength of a magnetic pole is also considered, along with the angle of deflection of the needle when in two magnetic fields. Subsequent chapters offer a thorough treatment of the strength of the magnetic field and the magnet's moment of inertia and magnetic moment; the earth's magnetic force; and how the different parts of the ship's magnetic force give different types of deviation. The book also explains the heeling error and its causes; the principle underlying successful compass adjustment; the effect of the ship's magnetic forces on the directive force felt by the compass needles; and sub-permanent magnetism. This monograph will be of value to students and practitioners interested in ship magnetism and the magnetic compass.
Front Cover 1
Ship Magnetism and the Magnetic Compass 4
Copyright Page 5
Table of Contents 6
PREFACE 8
CHAPTER I. MAGNETOMETRY 10
Unit Pole and Law of Inverse Squares 10
Field Strength, Moment, Long and Short Magnet, Restoring Couple 15
Angle of Deflection of Needle, when in Two Magnetic Fields 21
CHAPTER II. MAGNETOMETRY 31
Comparison of Field Strength and Moment 31
CHAPTER III. TERRESTRIAL MAGNETISM 38
CHAPTER IV. SHIP MAGNETISM 43
Magnetic Induction 43
Resolution of the Permanent Magnetic Field at the Compass Position into Three Components 44
CHAPTER V. SHIP MAGNETISM 47
The Coefficients 47
Coefficient A 47
Coefficient B 49
Coefficient C 51
Permanent B and Permanent C combined 53
Coefficient D 55
Coefficient E 57
Recapitulation 60
CHAPTER VI. SHIP MAGNETISM 72
Heeling Error 72
CHAPTER VII. SHIP MAGNETISM 84
Changes in Deviation arising from Changes of Magnetic Latitude 84
CHAPTER VIII. PRINCIPLES OF COMPASS ADJUSTMENT 94
Theoretical Compensation for Deviation 94
Separation (Splitting) of Total B and Heeling Error into the Permanent and Induced Parts 95
CHAPTER IX. PRINCIPLES OF COMPASS ADJUSTMENT 115
Combined Correction of Induced B and Induced C 115
Adjustment of all Quadrantal Deviations 118
CHAPTER X. DIRECTIVE FORCE 124
The Influence of Hard and Soft Iron on the Horizontal Force at the Compass Position 124
Coefficient Lambda 126
Adjustment of the Compass from Knowledge of Directive Force 128
Loss in Directive Force 132
CHAPTER XI. DEFLECTING METHODS OF MEASURING RELATIVE DIRECTIVE FORCE 135
Principle 135
Methods 135
CHAPTER XII. VERTICAL FORCE AT THE COMPASS POSITION 147
Coefficient Mu: Correction of Heeling Error by Vertical Force Instrument 147
CHAPTER XIII. SUB-PERMANENT MAGNETISM 158
Hysteresis 158
CHAPTER XIV. COMPASS ADJUSTMENT: GENERAL CONSIDERATIONS AND PROCEDURE 161
Reasons for Adjusting Compasses 161
Order of Making Correction 162
Preparations and Precautions before Adjusting 163
CHAPTER XV. PRACTICAL COMPASS ADJUSTMENT 166
On the Compass 166
On the Deviascope 170
REVISION QUESTIONS 175
ANSWERS TO EXERCISES 186
INDEX 196
| Erscheint lt. Verlag | 9.5.2014 |
|---|---|
| Sprache | englisch |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Elektrodynamik |
| Technik ► Bauwesen | |
| ISBN-10 | 1-4831-8054-9 / 1483180549 |
| ISBN-13 | 978-1-4831-8054-0 / 9781483180540 |
| Haben Sie eine Frage zum Produkt? |
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