Abstract
THE third instalment of the work edited by Prof. Gutenberg maintains the standard of the first two. It begins with a clear and up-to-date account of terrestrial magnetism by Dr. J. Bartels. One learns in it that the whole energy of the earth's permanent magnetic field is equivalent to that of the radiation received from the sun in three seconds! —or, it maybe remarked, to the gravitational energy released by a radial contraction of the order of 10-6 cm. Prof. Gutenberg then devotes sixty-six pages to the physical constitution, figure, density, and thermal state of the earth. In a useful, if brief, account of the figure of the earth, the Badau approximation is given, but neither Darwin nor Callandreau is mentioned.
Lehrbuch der Geophisik.
Herausgegeben von Dr. B. Gutenberg. Lieferung 3. Pp. 401 - 608. (Berlin: Gebrüder Borntraeger, 1926.) 12 gold marks.
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J., H. Lehrbuch der Geophisik . Nature 120, 471 (1927). https://doi.org/10.1038/120471a0
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DOI: https://doi.org/10.1038/120471a0