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	Léon Foucault - Wikipedia, the free encyclopedia
		Jean Bernard Léon Foucault (18 September 1819–11 February 1868) was a French physicist best known for the invention of the Foucault pendulum, a device demonstrating the effect of the Earth's rotation.
		Diagram of a variant of Leon Foucault's speed of light experiment where a modern laser is the source of light.
		Foucault died of what was probably a rapidly-developing case of multiple sclerosis on February 11, 1868 at Paris and was buried in the Cimetière de Montmartre.
	www.wikipedia.org /wiki/Leon_Foucault (668 words)

	Foucault pendulum - Wikipedia, the free encyclopedia
		A Foucault pendulum, or Foucault's pendulum, named after the French physicist Léon Foucault, was conceived as an experiment to demonstrate the rotation of the Earth; its action is a result of the Coriolis effect.
		The first Foucault pendulum exhibited to the public was in February 1851 in the Meridian Room of the Paris Observatory.
		Foucault pendulum at the Musée des arts et métiers (Paris); pegs are placed around and are knocked down as the pendulum swing plane veers.
	en.wikipedia.org /wiki/Foucault_pendulum (613 words)

	CATHOLIC ENCYCLOPEDIA: Jean-Bertrand-Leon Foucault
		The Foucault pendulum was invented to demonstrate visibly the rotation of the earth; the one exhibited at the Pantheon in Paris in 1851, was 220 feet long.
		Foucault currents are heating currents of electricity developed in a disc of metal rotating between the poles of a strong magnet.
		Foucault at first appeared careless in the performance of his religious duties but in later years he was a practical Catholic.
	www.newadvent.org /cathen/06156c.htm (628 words)

	MSN Encarta - Search Results - Foucault
		Foucault, Michel (1926-1984), French philosopher, who attempted to show that the basic ideas which people normally take to be permanent truths about...
		Foucault, Jean Bernard Léon (1819-1868), French physicist, born in Paris.
		Foucault Pendulum, type of pendulum that demonstrates the rotation of the earth.
	ca.encarta.msn.com /Foucault.html (84 words)

	JEAN BERNARD LEON FOUCAULT - LoveToKnow Article on JEAN BERNARD LEON FOUCAULT (Site not responding. Last check: 2007-09-17)
		In Seotember of that year he discovered that the force required for the rotation of a copper disk becomes greater when it is made to rotate with its rim between the poles of a magnet, the disk at the same time becoming heated by the eddy or Foucault currents induced in its metal.
		Foucault invented ifl 1857 the polarizer which bears his name, and in the succeeding year devised a method of giving to the speculum of reflecting telescopes the form of a spheroid or a paraboloid of revolution.
		Foucault died of paralysis on the 11th of February 1868 at Paris.
	www.1911encyclopedia.org /F/FO/FOUCAULT_JEAN_BERNARD_LEON.htm (439 words)

	Léon Foucault: The invention of Foucault Pendulum
		In 1851, Léon Foucault, A French physicist, demonstrated the rotation of the Earth on its axis by his new invented Foucault pendulum, or Foucault's pendulum, named after him, by suspending a 67-metre wire from the dome of the Panthéon in Paris.
		Foucault first pendulums of this type, consisted of a 28-kilogram (62-pound) iron ball suspended from the dome of the Panthéon in Paris by a steel wire 67 m (220 feet) long and kept in motion by a mechanism.
		Foucault Pendulum - Muzeum Mikolaja Kopernika we Fromborku
	www.juliantrubin.com /bigten/foucaultpendulum.html (804 words)

	foucault (Site not responding. Last check: 2007-09-17)
		Léon Foucault, the man who proved Copernicus’s big idea, developed no high-powered mathematical theories like Newton or Einstein, but even as a boy, he was a genius with his hands, designing and building precision toys and gadgets.
		Foucault realized that the pendulum’s rate of rotation would change with its location, and he derived an equation that predicted rotational time at any latitude.
		Foucault was famous, and his fame grew after he invented the gyroscope, a spinning disc that maintains a constant orientation in space.
	scibooks.org /foucault.html (796 words)

	Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		Such a “Foucault pendulum” always swings in the same vertical plane, but on a rotating Earth, this vertical plane slowly changes, at a rate and direction dependent on the geographic latitude of the pendulum.
		For this demonstration and a similar one utilizing a gyroscope, Foucault received in 1855 the Copley Medal of the Royal Society of London and was made physical assistant at the Imperial Observatory, Paris.
		He discovered the existence of eddy currents, or “Foucault currents,” in a copper disk moving in a strong magnetic field, constructed an improved mirror for the reflecting telescope, and in 1859 invented a simple but extremely accurate method of testing telescope mirrors for surface defects.
	www.britannica.com /ebc/print_toc?tocId=9035012 (301 words)

	Foucault, Jean-Bernard-Leon -- Encyclopædia Britannica
		Foucault was educated for the medical profession, but his interests turned to experimental physics.
		In 1851 the French physicist Jean-Bernard-Léon Foucault assembled in Paris the first pendulums of this type, one of which consisted of a 28-kg (62-pound) iron ball suspended...
		Born in Poitiers, Michel Foucault studied in Paris under Marxist philosopher Louis Althusser and later taught at the University of Clermont-Ferrand from 1960 to 1968 and the Collège de France from 1970 to 1984.
	www.britannica.com /eb/article-9035012 (809 words)

	NewsScan Publishing Inc. - NewsScan Daily Archives (Site not responding. Last check: 2007-09-17)
		TODAY'S HONORARY SUBSCRIBER is Leon Foucault (1819-1868), the French physicist who determined the velocity of light, showed that light travels more slowly in water than it does in air, invented the gyroscope, and improved the mirrors used on reflecting telescopes.
		A Foucault pendulum is one that is free to swing in any direction, which means that the plane of swing gradually rotates as the Earth turns under it.
		Donne's obituary of his friend revealed some of Foucault's many facets: "When I had introduced him into the intimacy of my own family, he was often felt to be disagreeable and annoying, most especially because he never lost his temper but defended his opinions in a tone that was always cool and calm.
	www.newsscan.com /cgi-bin/findit_view?table=honorary_subscriber&id=97 (452 words)

	Revolving around Léon Foucault (March 2004) - Review - PhysicsWeb
		The next brief phase of Foucault's career was when he explored the movement of the Earth; this proved to be the most productive period in terms of recognized contributions to science.
		Foucault's insights came instead from his expertise at figuring out experimental or technological means of illustrating a scientific problem; his best science was almost always applied.
		In the aftermath of his work on the pendulum and the gyroscope, Foucault found - through the patronage of Emperor Napoleon III - official employment as physicist for the Paris Observatory in 1855 and the Bureau of Longitudes in 1862.
	physicsweb.org /articles/review/17/3/1 (982 words)

	When reason proved Earth's rotation - The Washington Times: Books - August 01, 2004 (Site not responding. Last check: 2007-09-17)
		Foucault's proving of Earth's rotation on its axis took place in a Paris basement on the night of Jan. 6, 1851.
		They didn't, until near the end of Foucault's short life (he died at 49), when he was inducted into the Academy of Sciences, one of the highest awards that can be bestowed on a French scientist.
		Later, Donne turned over the editorship of the science pages to his assistant, which gave Foucault the opportunity to keep abreast of what was happening in the scientific community — and to establish, as he soon did, a reputation as a brash but thoroughly knowledgeable editor.
	www.washtimes.com /books/20040731-101357-2546r.htm (1370 words)

	ipedia.com: Léon Foucault Article (Site not responding. Last check: 2007-09-17)
		Jean Bernard Léon Foucault was a French physicist best known for the invention of the Foucault pendulum, a device demonstrating the effect of the Earth's rotation.
		Jean Bernard Léon Foucault (September 18, 1819—February 11, 1868) was a French physicist best known for the invention of the Foucault pendulum, a device demonstrating the effect of the Earth's rotation.
		With Wheatstone’s revolving mirror he in 1862 determined the speed of light to be 298,000 km/s (about 185,000 mi/s) —10,000 km/s less than that obtained by previous experimenters and only 0.6% off the currently accepted value.
	www.ipedia.com /leon_foucault.html (525 words)

	Interesting Thing of the Day: Measuring the Speed of Light
		Foucault worked in a variety of scientific fields, with his greatest claim to fame being a simple mechanical method for proving the rotation of the Earth—what came to be known as Foucault’s Pendulum.
		Foucault’s method was to shine a sharply focused beam of light onto a rotating mirror, and from there onto a fixed mirror.
		Foucault could easily measure the angle between the original light source and the reflected beam, and along with known constants (the distances between the various surfaces and the speed of the mirror’s rotation), it was a matter of a few straightforward calculations to convert that small angle into a representation of speed.
	itotd.com /articles/284 (1235 words)

	The Foucault pendulum of the "arts et métiers" museum from Paris
		The Foucault's pendulum which was exhibited during the International exhibition of Paris in 1855, is now in the chorus of the church "Saint Martin des champs" in Paris.
		Leon Foucault observed a small movement of the oscillation plan of the pendulum.
		The oscillation period of the Foucault's pendulum of the museum is 8,5 s and is apparent complete rotation occurs in 31,78 h = 31.
	visite.artsetmetiers.free.fr /site_anglais/pendulum_museum_a.html (691 words)

	Document: Foucault's Most Famous Experiments
		In 1851 Foucault used a pendulum to demonstrate the earth’s rotary motion to the public, proving at the same time that the earth is not an inertial system.
		As a result of the Coriolis force, a slow rotation of the pendulum’s plane of oscillation is observed with a long oscillation time which is dependent on the geographic latitude of the location concerned.
		Foucault used a pendulum weighing 28 kg on a wire 67 m long.
	www.zeiss.de /C12567A100537AB9/allBySubject/870CAA13582D55D4C12569CF004ABFAB (295 words)

	The Foucalt Pendulum
		A general explanation of the precession of the Foucault pendulum, some history about the ideas of inertial frames, some implications, and a more detailed analysis of the motion.
		In 1851, Jean-Bernard-Leon Foucault suspended a 67 metre, 28 kilogram pendulum from the dome of the Pantheon in Paris.
		The Foucault Pendulum at the School of Physics of The University of New South Wales is a "hands-on" version.
	www.phys.unsw.edu.au /PHYSICS_!/FOUCAULT_PENDULUM/foucault_pendulum.html (1491 words)

	Leon Foucault : Léon Foucault (Site not responding. Last check: 2007-09-17)
		In 184g [?] he contributed to the Comptes Rendus a description of an electromagnetic regulator for the electric arc lamp, and, in conjunction with H. Regnault, a paper on binocular vision.
		With Wheatstone’s revolving mirror he in 1862 determined the speed of light to be 298,000 km (about 185,000 mi.
		Foucault died of paralysis on February 11, 1868 at Paris.
	www.termsdefined.net /l%25/l%e9on-foucault.html (605 words)

	Free-CliffNotes.com - Foucalt (Site not responding. Last check: 2007-09-17)
		Foucault was born into a fairly wealthy family.
		Foucault, like many of the great thinkers of his time, was a specialist in multiple fields.
		Jean Bernard Leon Foucault is probably not the first scientist you think of when you think of great impacts on society.
	www.free-cliffnotes.com /data/gc/skx66.shtml (435 words)

	Decrypting the Eclipse
		A scientific tour de force, Foucault's demonstration forever attached his name both to the effect itself (the Foucault effect) and to the universal joint pendulum that freely swings and rotates at the same time (the Foucault pendulum).
		Foucault's dramatic proof at the World's Fair is considered to be the first non-astronomical proof of the Earth's rotation.
		Depending on geographic position, the rotation of the Earth on a Foucault clock can be measured as different rotation rates: infinite period at the equator; approximately 24 hours at the poles; clockwise in the Southern Hemisphere; counter-clockwise in the Northern Hemisphere.
	science.nasa.gov /newhome/headlines/ast06aug99_1.htm (2847 words)

	Jean Bernard Leon Foucault Biography / Biography of Jean Bernard Leon Foucault Main Biography
		The French physicist Jean Bernard Léon Foucault (1819-1868) is remembered for the Foucault pendulum, by which he demonstrated the diurnal rotation of the earth, and for the first accurate determination of the velocity of light.
		Léon Foucault, son of a Paris bookseller, was born on Sept. 18, 1819.
		This brought Foucault contact with the physicist Hippolyte Fizeau, who was at that time attempting to improve the daguerreotype process, and they collaborated for several years on optical topics.
	www.bookrags.com /biography-jean-bernard-leon-foucault (253 words)

	Foucault -- 19th Century Physicist (Site not responding. Last check: 2007-09-17)
		Jean Foucault (pronounced "Foo-Koh") was born on September 19, 1819 to a French Publisher.
		He also developed the Foucault pendulum, with which he demonstrated the rotation of the earth.
		Foucault died on February 11, 1868 in France.
	helix.gatech.edu /Classes/ME2202/2000S3/Projects/Swarner/foucault.htm (160 words)

	Sample text for Library of Congress control number 2003284133
		Foucault's remaining problems with the experiment were technical ones, and he was an expert at doing precision work with his hands.
		Foucault had thus created a free-swinging pendulum, suspended from the ceiling.
		On January 3, 1851, Foucault's apparatus was ready, and he set the device in motion.
	www.loc.gov /catdir/samples/simon041/2003284133.html (789 words)

	Amazon.ca: Books: Pendulum : Leon Foucault and the Triumph of Science (Site not responding. Last check: 2007-09-17)
		Aczel follows Foucault from his beginnings as a medical student and a science journalist covering the meetings of the august French Academy of Sciences to his installation as the official physicist attached to the Imperial...
		The actual strange behavior was not understood by Foucault, nor has it been good to continue to champion his ridiculous claim that the complex phenomenon, which is observed, clearly demonstrates that the earth rotates.
		Amir Aczel's "Pendulum: Leon Foucault and the Triumph of Science" artfully combines history, biography, and science in a way that captures the human drama behind Foucault's demonstration--as irrefutable as it was ingenious--of the earth's rotation in the 1850s.
	www.amazon.ca /exec/obidos/ASIN/0743464788/wwwhometalkec-20 (1806 words)

	Compare Prices and Read Reviews on Pendulum: Leon Foucault and the Triumph of Science at Epinions.com (Site not responding. Last check: 2007-09-17)
		Foucault was a prodigious scientist and inventor, easily on par with geniuses like Edison, despite having no formal scientific training.
		In addition to proving that the Earth rotates, Foucault is credited with inventing gyroscopes, computing (with incredible accuracy) the speed of light, making great improvements to the photographic process of the time, and improving the way telescopes were designed and built (improvements that are still used in modern telescopes), among other things.
		Because Foucault had no formal scientific training he was largely looked down on by these organizations, despite his tremendous contributions to science.
	www.epinions.com /content_174364855940 (535 words)

	How a scientist swung into the truth \| csmonitor.com (Site not responding. Last check: 2007-09-17)
		When Foucault showed this common-sense perception to be deceptive, a stubbornly held world view changed forever.
		Foucault was a brilliant engineer, but a self-taught, mathematically naive physicist.
		Physicists explain the pendulum rotation in terms of two distinct reference frames: that is, two sets of coordinates that specify the position of an object in three dimensions (east-west, north-south, up-down).
	www.csmonitor.com /2003/1002/p17s01-bogn.html (687 words)

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