BARLOW, PETER. An Essay on Magnetic Attractions, and on the Laws of Terrestrial and Electro Magnetism . . . Second Edition, much enlarged and improved.<> 6 engraved plates (foxed). Errata leaf and 2 integral ad leaves at end. Publisher's 16-page catalogue bound in front dated April 1827. 8vo, original boards, spine darkened and worn, missing portion at bottom, joints cracked, cords intact; old institutional stamp on title and recto of plates; uncut. London, 1824 [i. e., 1827]
"In 1819 Barlow became interested in the compass deviation caused by the iron in ships. He therefore investigated the action of terrestrial magnetism and conducted a series of experiments on the interaction of iron objects and compass needles. His results, published as Essay on Magnetic Attractions (1820), described a method of correcting ships' compasses by use of a small iron plate"--DSB I, 460. Wheeler Gift 765.<
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