Abstract
WITH regard to the earth's magnetism, the general conclusions from observations made on its surface are that it is partly permanent, partly induced, and subject to the effects of electric currents in the earth's crust and the surrounding atmosphere. Moreover, that the direct action of the sun plays a comparatively subordinate part in producing the observed phenomena.
Terrestrial Magnetism and its Causes.
By F. A. Black. Pp. xii + 226. (London and Edinburgh: Gall and Inglis, 1905.) Price 6s. net.
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Terrestrial Magnetism and its Causes . Nature 71, 557 (1905). https://doi.org/10.1038/071557a0
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DOI: https://doi.org/10.1038/071557a0