The Magnetism of Ships, and the Mariner's Compass —— Being a Rudimentary Exposition the Compass, Induced Magnetism of Iron in Sea-Going Vessels, and Its Action on the Compass, in Different Latitudes, and Under Diversified

----- 船舶的磁性和水手的指南针

ISBN: 9781332058457 出版年：2016 页码：229 William Walker Forgotten Books

When a person writes anything in the shape of a book for publication, he is expected to give a reason why he writes it, and for what purpose. In order to satisfy this expectation, I have to inform the reader that, although cheap elementary and popular treatises on almost every subject relating to mechanical, manual, or practical industry can be obtained in a condensed form, and at small cost, one looks in vain for a sound, practical, elementary, and popular work on the induced Magnetism of Ships, and the influence it exerts on the Mariner's Compass.