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 107
r whichis caused by the mag-netism of horizontal softiron, attains its maxi-mum value on the quad-rantal points, the ship isswung in the direction ofone of these points, forexample, N E, as shownin Fig. 2; and since theerror is caused by softiron, it is necessary tocompensate it by using hollow… … NAVIGATION 75 quadrants and westerly in the N W and S E quadrants inalmost every ship, the spheres are placed athwartship on thesame horizontal plane and at equal distances from the cen-ter of the compass, the distance being determined by trial,moving them to and fro in their respective, slits…
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