Güroskoop (Estonian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Güroskoop" in Estonian language version.

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L. Foucault (1852) "Sur les phénomènes d’orientation des corps tournants entraînés par un axe fixe à la surface de la terre — Nouveaux signes sensibles du mouvement diurne" (On the phenomena of the orientation of rotating bodies carried along by an axis fixed to the surface of the earth — New perceptible signs of the daily movement), Comptes rendus hebdomadaires des séances de l’Académie des Sciences (Paris), vol. 35, pages 424–427. Available on-line (in French): http://gallica.bnf.fr/ark:/12148/bpt6k2992n/f428.image .

Walter R. Johnson (January 1832). "Description of an apparatus called the rotascope for exhibiting several phenomena and illustrating certain laws of rotary motion", The American Journal of Science and Art, 1st series, vol. 21, no. 2, pages 265–280.
Drawings of Walter R. Johnson's gyroscope ("rotascope") were used to illustrate phenomena in the following lecture: E.S. Snell (1856) "On planetary disturbances," Board of Regents, Tenth Annual Report of the Board of Regents of the Smithsonian Institution.... (Washington, D.C.: Cornelius Wendell, 1856), pages 175–190.
Circa 1852, Friedrich Fessel, a German mechanic and former secondary school teacher, independently developed a gyroscope. See: (1) Julius Plücker (September 1853) "Über die Fessel'sche rotationsmachine", Annalen der Physik, vol. 166, no. 9, pages 174–177; (2) Julius Plücker (October 1853) "Noch ein wort über die Fessel'sche rotationsmachine", Annalen der Physik, vol. 166, no. 10, pages 348–351; (3) Charles Wheatstone (1864) "On Fessel's gyroscope", Proceedings of the Royal Society of London, vol. 7, pages 43–48.

Johann G. F. Bohnenberger (1817) "Beschreibung einer Maschine zur Erläuterung der Gesetze der Umdrehung der Erde um ihre Axe, und der Veränderung der Lage der letzteren" (Description of a machine for the explanation of the laws of rotation of the Earth around its axis, and of the change of the orientation of the latter), Tübinger Blätter für Naturwissenschaften und Arzneikunde, vol. 3, pages 72–83.
The French mathematician Poisson mentions Bohnenberger's machine as early as 1813: Simeon-Denis Poisson (1813) "Mémoire sur un cas particulier du mouvement de rotation des corps pesans" [Memoir on a special case of rotational movement of massive bodies], Journal de l'École Polytechnique, vol. 9, pages 247–262. Available on-line at: http://www.ion.org/museum/files/File_2.pdf .