Magnetism of Ships, and the Mariner's Compass e-bog

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. 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.