Rattleback: Difference between revisions

Revision as of 09:48, 11 December 2006

Revision as of 09:54, 11 December 2006

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[[Image:Celt_with_gemstone_turtles-01.jpg|thumb|300px|Carved wooden rattleback]]

A '''rattleback''', also known as a "celt," "Celtic stone," "spin bar," "tatesTates," "wobble stone" or "wobblestone," and by the product names "ARK," "RATTLEBACKS" and "Space Pets," is a semi-ellipsoidal [[top]] which will spin on its axis in a preferred direction. But, if spun in the opposite direction, it becomes unstable, "rattles," stops and reverses its spin to the preferred direction.

:''Behold the mysterious celt,''

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Crane [[Doctor of Philosophy|Ph.D.]], H. Richard. "How things work: The rattleback revisited." ''The Physics Teacher'', vol. 29(5), pp. 278-9. American Association of Physics Teachers. College Park, Md. 1991.

Dammermann, W. "Celtic Wackelsteine." ''Physics in our time'', vol. 12, pp. 178-80. 1981.

Edge [[Doctor of Philosophy|Ph.D.]], Ronald D. and Richard Lee Childers [[Doctor of Philosophy|Ph.D.]]. "String and sticky tape: Curious celts and riotous rattlebacks." ''The Physics Teacher'', vol. 37(2), p. 80. American Association of Physics Teachers. College Park, Md. 1999.

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Gray, Andrew. ''Treatise of gyrostatics and rotational motion''. Macmillan Publishers Ltd. London. 1918.

Holzhey, C. and H. Puschmann. "The Celtic Wackelstein: A remarkable gyroscope." ''Recent Science'', vol 1, no. 2, pp. 6-15. 1986.

Magnus, Karl. ''The stability of rotations of a non-symmetrical body on a horizontal surface''. Festschrift Szabo, pp. 19-23, Berlin. 1971.

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[[Jearl Walker|Walker Ph.D., Jearl]]. "Rattlebacks and tippe tops; Roundabout: The physics of rotation in the everyday world." ''Scientific American'', pp. 33-8, 66. Scientific American Inc. New York. 1985.

[[Jearl Walker|Walker Ph.D., Jearl]]. "Puzzling gyroscopes." ''Spektrum der Wissenschaft'', part 1, December 1979, pp. 109-13, 1979; part 2, May 1981, pp. 151-7, 1981.

[[Gilbert Walker|Walker FRS, Sir Gilbert Thomas]]. "On a curious dynamical property of celts." ''Proceedings of the Cambridge Philosophical Society'', vol. 8, pp. 305-6. Cambridge, England. 1892/5.