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SYSTEM OF FIXED AND MOVEABLE COMPASS CARDS
FOR ASCERTAINING AND APPLYING THE DEVIATION OF THE COMPASS.
From the "ELEMENTARY MANUAL for the DEVIATION of the COMPASS in IRON SHIPS;"
THE OUTER fixed card represents a Compass not affected by the iron of the ship:-
The INNER moveable card represents the Compass as affected by the iron of the ship;
SAILOR'S POCKET BOOK:
A COLLECTION OF
PRACTICAL RULES, NOTES, AND TABLES,
FOR THE USE OF
THE ROYAL NAVY, THE MERCANTILE MARINE, AND YACHT SQUADRONS.
BY COMMANDER F. G. D. BEDFORD, R.N.,
Second Edition, Revised and Enlarged.
WITH CHARTS, ILLUSTRATIONS, AND INDEX.
J. GRIFFIN & Co.,
(Publishers to H.R.H. The Duke of Edinburgh,)
PALL MALL, LONDON.