The Magnetic Declination by Mioara Mandea

Author:Mioara Mandea
Language: eng
Format: epub
ISBN: 9783031094767
Publisher: Springer International Publishing

This first map formed the basis for the next editions. Halley had been aware that his map would become inaccurate because of the secular variation. However, the map was revised only some four decades after, in 1745 by William Mountaine and James Dodson. A second revision was produced in 1756, and a revision of that edition produced by the French Royal Hydrographer, Jacques-Nicolas Bellin in 1765. None of the editions published throughout the 18th century covered the whole of the Pacific Ocean, and the contours do not extend over land areas (Barraclough 2000).

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