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The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes (1906)

International Correspondence Schools, Roden, Ernest Konrad, 1866-, International Correspondence Schools. Pocketbook · Scranton, Pa. : International Textbook Co. · leaf 106

An illustration from The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes, 1906, leaf 106
mag-netic north A to n.Fig. 1. Then, inorder to bring the needle back to its proper position N, or,what is the same thing, to counteract the effect of the sur-rounding iron and steel, magnets may be placed in any of thepositions shown at a suitable distance from the needle. Itwill be noticed in… … 74 NAVIGATION The two principal errors of a compass to compensate arethe semicircular deviation and the quadrantal deviation.The semicircular error is the combined effect of subper-manent magnetism of the ship and the induced magnetismof vertical iron; but, as a whole and for the purpose…

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