Rare Books
Directions for the use of a small apparatus to be employed with a ship's standard compass : for the purpose of ascertaining at any time, whether at sea or in harbour, the changing part of the deviation in the pointing of the compass occasioned by the ship's iron ; or that part of the deviation which is usually different in different parts of the globe
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Admiralty manual for ascertaining and applying the deviations of the compass caused by the iron in a ship
Rare Books
711621