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Blackett effect
The Blackett effect, also called gravitational magnetism, is the hypothetical generation of a magnetic field by an uncharged, rotating body. This effect has never been observed.
==History==
Gravitational magnetism was proposed by the German-British physicist Arthur Schuster as an explanation for the magnetic field of the Earth,〔A Critical Examination of the Possible Causes of Terrestrial Magnetism, A. Schuster, ''Proceedings of the Physical Society of London'' 24 (1911–1912), pp. 121–137.〕 but was found nonexistent in a 1923 experiment by H. A. Wilson.〔(An Experiment on the Origin of the Earth's Magnetic Field ), H. A. Wilson, ''Proceedings of the Royal Society of London, Series A'' 104, #727 (November 1, 1923), pp. 451–455.〕 The hypothesis was revived by the British physicist P. M. S. Blackett in 1947 when he proposed that a rotating body should generate a magnetic field proportional to its angular momentum.〔(The magnetic field of massive rotating bodies ), P. M. S. Blackett, ''Nature'' 159, #4046 (May 17, 1947), pp. 658–666.〕 This was never generally accepted, and by the 1950s even Blackett felt it had been refuted.〔(Patrick Maynard Stuart Blackett, Baron Blackett, of Chelsea, 18 November 1897-13 July 1974 ), Bernard Lovell,
''Biographical Memoirs of Fellows of the Royal Society'' 21 (November 1975), pp. 1–115.〕, pp. 39–43
The Blackett effect was used by the science fiction writer James Blish in his series ''Cities in Flight'' (1955–1962) as the basis for his fictional stardrive, the spindizzy.〔''Cities in Flight'', James Blish. New York: Avon, 1982. ISBN 0-380-00998-6.〕
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