Ship Magnetism and the Magnetic Compass - 1st Edition - ISBN: 9780080097695, 9781483180540

Ship Magnetism and the Magnetic Compass

1st Edition

The Commonwealth and International Library of Science, Technology, Engineering and Liberal Studies: Navigation and Nautical Courses

Authors: F. G. Merrifield
Editors: J. H. Clough Smith G. E. Earl
eBook ISBN: 9781483180540
Imprint: Pergamon
Published Date: 1st January 1963
Page Count: 198
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Description

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.

Table of Contents


Preface


Chapter I. Magnetometry (1)


Unit Pole and Law of Inverse Squares


Field Strength, Moment, Long and Short Magnet, Restoring Couple


Angle of Deflection of Needle, when in Two Magnetic Fields


Chapter II. Magnetometry (2)


Comparison of Field Strength and Moment


Chapter III. Terrestrial Magnetism


Chapter IV. Ship Magnetism (1)


Magnetic Induction


Resolution of the Permanent Magnetic Field at the Compass Position into Three Components


Chapter V. Ship Magnetism (2)


The Coefficients


Coefficient A


Coefficient B


Coefficient C


Permanent B and Permanent C Combined


Coefficient D


Coefficient E


Recapitulation


Chapter VI. Ship Magnetism (3)


Heeling Error


Chapter VII. Ship Magnetism (4)


Changes in Deviation arising from Changes of Magnetic Latitude


Table showing Characteristics of the Coefficients


Chapter VIII. Principles of Compass Adjustment (1)


Theoretical Compensation for Deviation


Separation (Splitting) of Total B and Heeling Error into the Permanent and Induced Parts


Chapter IX. Principles OF Compass Adjustment (2)


Combined Correction of Induced B and Induced C


Adjustment of all Quadrantal Deviations


Chapter X. Directive Force


The Influence of Hard and Soft Iron on the Horizontal Force at the Compass Position


Coefficient Lambda


Adjustment of the Compass from Knowledge of Directive Force


Loss in Directive Force


Chapter XI. Deflecting Methods of Measuring Relative Directive Force


Principle


Methods


Chapter XII. Vertical Force at the Compass Position


Coefficient Mu


Details

No. of pages:
198
Language:
English
Copyright:
© Pergamon 1963
Published:
Imprint:
Pergamon
eBook ISBN:
9781483180540

About the Author

F. G. Merrifield

About the Editor

J. H. Clough Smith

G. E. Earl

Ratings and Reviews