Abstract
“THE earth itself is a great magnet.”So wrote Dr. William Gilbert, fellow of St. John's College, Cambridge, nearly three and a half centuries ago. The detailed geographical determination of the nature of that magnetism, and the attempts to identify its origin, have since attracted much effort and friendly international co-operation. But, substantially, Gilbert's challenging statement still remains something of a mystery. For while much is now known of the origin of the small, but significant, periodic components of the earth's magnetic field, the genesis of the much greater quasi-permanent components continues unexplained.
Geomagnetism
By Prof. Sydney Chapman Prof. Julius Bartels. (International Series of Monographs on Physics.) Vol. 1: Geomagnetic and Related Phenomena. Pp. xxviii + 542. Vol. 2: Analysis of the Data, and Physical Theories. Pp. x + 543–1050. (Oxford: Clarendon Press; London: Oxford University Press, 1940.) 63s. net.
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APPLETON, E. PROGRESS OF GEOMAGNETISM. Nature 149, 177–178 (1942). https://doi.org/10.1038/149177a0
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DOI: https://doi.org/10.1038/149177a0
