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, but was found nonexistent in a 1923 experiment by H. A. Wilson.[1][2] 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.[3] This was never generally accepted, and by the 1950s even Blackett felt it had been refuted.[4], 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.[5]

gollark: I have it hooked to a keyboard shortcut.
gollark: I use a Python window.
gollark: People often advocate for *consequences*/good-sounding goals, and just handwave how to actually achieve those, or just come up with a nice-sounding system and handwave tricky parts.
gollark: Just figure out what results you think a political system should produce ("emotionally"/based on your moral opinions or whatever) and work out what sort of system would be practical and good at producing those results "logically".
gollark: Oh no.

References
  1. 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.
  2. 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.
  3. The magnetic field of massive rotating bodies, P. M. S. Blackett, Nature 159, #4046 (May 17, 1947), pp. 658–666.
  4. 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.
  5. Cities in Flight, James Blish. New York: Avon, 1982. ISBN 0-380-00998-6.


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