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Die ättest en Karten der Isogonen, Isoclinen, Isodynamen

    Abstract

    THIS is the fourth of the elegant series of reprints devoted to classical contributions to meteorology and terrestrial magnetism. It contains seven maps, all excellently reproduced, and representing old standard charts of isogonic, isoclinic, and isodynamic lines. The maps portrayed are Halley's Declination Chart of the World, published in 1701; Whiston's two maps (1721), showing lines of equal magnetic Dip in the South of England; J. C. Wilcke's Isoclinic Chart of the World in 1768; a chart by Humboldt, published in 1804, showing Isodynamic lines over part of South America; and Hansteen's Isodynamic Charts (1825–26) of North-West Europe and of the world.

    Die ättest en Karten der Isogonen, Isoclinen, Isodynamen.

    By Prof. Dr. G. Hellmann. (Berlin: A. Asher and Co., 1895.)

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