"NAVIGATION AND SEAMANSHIP".

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Magnetic Compass Deviation and Correction (First Published 1951 - 3rd Edition 1979)
By W. Denne, F.Inst.Nav., A.R.I.N.A. A Manual of the Theory of the Deviations and Mechanical Correction of Magnetic Compasses in Ships. (Metric Edition) Revised by A.N. Cockcroft, F.R.L.N., Extra Master.

In addition to dealing with the properties of magnets and the earth's magnetism, three chapters are devoted to the magnetism of the ship, the third explaining in detail the reason for, and composition of, the "nine rods". The relation of the components P, Q and R are the rods to the various co-efficient are fully explained. The principle of the deflator and a discussion of the limits of accuracy are also included, together with a great deal of hitherto unpublished information.

CHAPTER CONTENTS: Definitions of Terms, Tables of their Symbols and their Meanings, Table of Formulae and Laws, Introduction, Space and Vector diagrams, Parallelogram and Triangle of Forces, Trigonometrical Ratios, Magnetism, General, Fundamental Facts of Magnetism, The Earth's Magnetism, Magnetic Measurements, The Ship's Magnetism, Preliminary, The Ship's Permanent Magnetism, The Ship's Induced Magnetism, The Theory of Deviations of the compass, Transformation of Equations (4) and (5), Deviations in Terms of the Compass Course, Healing Error, Analysis of Deviations, Theory of the Mechanical Correction of the Compass, The Mechanical Correction of the Compass. Worked Examples.

In addition to Compass Adjusters, the book will be of invaluable assistance to Lecturers and Teachers, Candidates for Certificates of Competency as Extra Master and Master and others interested in the subject. It is the standard work and is also used in the Examination Rooms.

Price: £13.00

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NAVIGATION AND SEAMANSHIP LIST, BROWN, SON & FERGUSON