Ship Magnetism and the Magnetic Compass: The Commonwealth and International Library of Science, Technology, Engineering and Liberal Studies: Navigation and Nautical Courses (Commonwealth Library)

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. Content: Front Matter, Page iii Copyright, Page iv PREFACE, Page vii CHAPTER I - MAGNETOMETRY (1), Pages 1-21 CHAPTER II - MAGNETOMETRY (2), Pages 22-28 CHAPTER III - TERRESTRIAL MAGNETISM, Pages 29-33 CHAPTER IV - SHIP MAGNETISM (1), Pages 34-37 CHAPTER V - SHIP MAGNETISM (2), Pages 38-62 CHAPTER VI - SHIP MAGNETISM (3), Pages 63-74 CHAPTER VII - SHIP MAGNETISM (4), Pages 75-84 CHAPTER VIII - PRINCIPLES OF COMPASS ADJUSTMENT (1), Pages 85-105 CHAPTER IX - PRINCIPLES OF COMPASS ADJUSTMENT (2), Pages 106-114 CHAPTER X - DIRECTIVE FORCE, Pages 115-125 CHAPTER XI - DEFLECTING METHODS OF MEASURING RELATIVE DIRECTIVE FORCE, Pages 126-137 CHAPTER XII - VERTICAL FORCE AT THE COMPASS POSITION, Pages 138-148 CHAPTER XIII - SUB-PERMANENT MAGNETISM, Pages 149-151 CHAPTER XIV - COMPASS ADJUSTMENT: GENERAL CONSIDERATIONS AND PROCEDURE, Pages 152-156 CHAPTER XV - PRACTICAL COMPASS ADJUSTMENT, Pages 157-165 REVISION QUESTIONS, Pages 166-176 ANSWERS TO EXERCISES, Pages 177-186 INDEX, Pages 187-189