
	Where results make sense

Topic: Dominique Arago

Related Topics

Jean Arago

Arago spot

Augustin Fresnel

	Kids.Net.Au - Encyclopedia > Dominique Arago (Site not responding. Last check: 2007-11-07)
		Arago was born at Estagel[?], a small village near Perpignan, in the département of Pyrenees-Orientales, France.
		Arago was elected a member the Board of Longitude immediately afterwards, and contributed to each of its Annuals, for about twenty-two years, important scientific notices on astronomy and meteorology and occasionally on civil engineering, as well as interesting memoirs of members of the Academy.
		Arago is also fairly entitled to be regarded as having proved the long-suspected connexion between the aurora borealis and the variations of the magnetic pa ments[?].
	www.kids.net.au /encyclopedia-wiki/do/Dominique_Arago?title=Bright's_disease (1784 words)

	The Infidels - François Arago
		Arago had succeeded in preserving the records of his survey; and his first act on his return home was to deposit them in the Bureau des Longitudes at Paris.
		Arago was elected a member of the Bureau des Longitudes immediately afterwards, and contributed to each of its Annuals, for about twenty-two years, important scientific notices on astronomy and meteorology and occasionally on civil engineering, as well as interesting memoirs of members of the Academy.
		Arago's earliest physical researches were on the pressure of steam at different temperatures, and the velocity of sound, 1818 to 1822.
	www.theinfidels.org /zunb-francoisarago.htm (2000 words)

	François Arago -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-07)
		François Jean Dominique Arago (February 26, 1786 – October 2, 1853) was a (The Romance language spoken in France and in countries colonized by France) French (A person skilled in mathematics) mathematician, (A scientist trained in physics) physicist, (A physicist who studies astronomy) astronomer, and (A person active in party politics) politician.
		Arago continued the work until 1809, his purpose being to measure a meridian (A continuous portion of a circle) arc in order to determine the exact length of a ((prosody) the accent in a metrical foot of verse) metre.
		Arago is also fairly entitled to be regarded as having proved the long-suspected connexion between the (The aurora of the northern hemisphere) aurora borealis and the variations of the magnetic pa ments[?].
	www.absoluteastronomy.com /encyclopedia/f/fr/fran%e7ois_arago.htm (2029 words)

	Arago, Dominique (Site not responding. Last check: 2007-11-07)
		Arago was born near Perpignan, studied at the Ecole Polytechnique in Paris, and was appointed to the Bureau of Longitudes.
		Arago's political affiliation was with the extreme left, and the revolution of 1848 saw him elected to a ministerial position in the provisional government.
		Arago also investigated the compressibility, density, diffraction, and dispersion of gases; the speed of sound, which he found to be 331.2 m/1,087 ft per second; lightning, of which he found four different types; and heat.
	www.cartage.org.lb /en/themes/Biographies/MainBiographies/A/Arago/1.html (249 words)

	Encyclopedia: FranÃ§ois Jean Dominique Arago (Site not responding. Last check: 2007-11-07)
		Arago had succeeded in preserving the records of his survey; and his first act on his return home was to deposit them in the Bureau des Longitudes at Paris.
		Arago's earliest physical researches were on the pressure of steam at different temperatures, and the velocity of sound, 1818 to 1822.
		Arago is also fairly entitled to be regarded as having proved the long-suspected connexion between the aurora borealis and the variations of the magnetic pa ments[?].
	www.nationmaster.com /encyclopedia/Fran%c3%a7ois-Jean-Dominique-Arago (4772 words)

	Dominique François Jean Arago Biography \| scit_0512345_package.xml
		Dominique Arago was a French astronomer and physicist who, in his scientific career, made important discoveries in the areas of optics, electromagnetic radiation, and served as director of the Paris Observatory.
		Arago was born in Estagel, France, and studied at the École Polytechnique in Paris, where he became a professor of analytical geometry at the age of 23.
		This was predicted by Fresnel in a paper on the diffraction of light, assuming that light consisted of waves and not the particles conjectured by Isaac Newton (1642-1727).
	www.bookrags.com /biography/dominique-franois-jean-arago-scit-0512345 (632 words)

	Arago spot
		An Arago spot is a bright point which, owing to diffraction, appears at the center of the shadow of a circular object in light from a point source[?].
		Siméon Poisson deduced from Augustin Fresnel's theory the necessity of a bright spot at the centre of the shadow of a circular opaque obstacle.
		With this counterintuitive result Poisson hoped to disprove the wave theory; however Dominique Arago experimentally verifed the prediction and today the demonstration goes by the name "Poisson's (Arago's) spot".
	www.ebroadcast.com.au /lookup/encyclopedia/po/Poisson_spot.html (104 words)

	Arago, Dominique (Site not responding. Last check: 2007-11-07)
		Arago was born near Perpignan, studied at the Ecole Polytechnique in Paris, and was appointed to the Bureau of Longitudes.
		Arago's political affiliation was with the extreme left, and the revolution of 1848 saw him elected to a ministerial position in the provisional government.
		Arago also investigated the compressibility, density, diffraction, and dispersion of gases; the speed of sound, which he found to be 331.2 m/1,087 ft per second; lightning, of which he found four different types; and heat.
	cartage.org.lb /en/themes/Biographies/MainBiographies/A/Arago/1.html (249 words)

	Dominique François Arago biography
		Arago and Biot had to extend it from Barcelona to the Balearic Islands.
		Arago was now held to be a spy; his signals were interrupted; and with great difficulty he succeeded in making his escape to Majorca, where he voluntarily imprisoned himself in the citadel of Belver, near Palma.
		Arago pursued the investigation and found that not only a magnetic needle, but even non-magnetic substances, such as rods of iron or steel, were subject to deflection, exhibiting during the action of the voltaic current a positive magnetic power, which, however, ceased with the cessation of the current.
	www.dromo.info /aragobio.htm (889 words)

	Arago, Dominique François Jean (1786-1853)
		During the solar eclipse of 1842, he examined polarized light from the chromosphere and corona, and determined that the Sun’s limb is gaseous.
		Arago suggested that his student Urbain Leverrier investigate irregularities in the orbit of Uranus and, after Neptune was discovered, took part in the argument regarding naming the planet and, with John Adams, regarding priority.
		Arago also wrote about the possibility of life on comets: "I do not pretend to draw from these considerations the conclusion that comets are populated by beings of our species.
	www.daviddarling.info /encyclopedia/A/Arago.html (388 words)

	Global Spiral :: Article
		If one were to ask for two most outstanding achievements of 19th century physics, they would be: (a) the recognition that light is essentially a wave motion; and (b) the recognition of the relationship between electricity and magnetism and the associated formulation of the laws of electromagnetism.
		Arago was one of the first to be quickly persuaded by this discovery that light is indeed a wave phenomenon.
		Arago suggested that the relative speed of light in water and in air should resolve this question.
	www.metanexus.net /metanexus_online/show_article2.asp?id=5696 (1380 words)

	François Arago
		François Arago was a French physicist and astronomer who made major contributions to the early study of electromagnetism including the phenomenon of magnetic rotation and the fact that a wire coil could be magnetized by passing electrical current through it.
		Arago’s studies in astronomy included investigations of the solar corona and chromosphere, measurements of the diameters of the planets, and a theory that light interference is responsible for the twinkling of stars.
		Arago was also active politically for France's leftist republican cause, serving several political roles in government in addition to his scientific duties (which included Director of the Paris Observatory).
	www.nndb.com /people/308/000032212 (338 words)

	Dominique Francois Arago (Site not responding. Last check: 2007-11-07)
		Seems thet Arago was the first man to build consciounsly an electromagnet, in september 1820, in the same time he noticed that rhe iron became a magnet only during the flow of current, the effect finished when the current stopped: the basis of Morse telegraph.
		Arago had also discovered, in 1824, that a disk of non-magnetic metal had the power of bringing a vibrating magnetic needle suspended over it rapidly to rest; and that on causing the disk to rotate the magnetic needle rotated along with it.
		Faraday saw mentally the rotating disk, under the operation of the magnet, flooded with his induced currents, and from the known laws of interaction between currents and magnets he hoped to deduce the motion observed by Arago.
	www.geocities.com /SiliconValley/Circuit/1858/aragoe.htm (292 words)

	The True Physics Project - Physics in a New Way. (Site not responding. Last check: 2007-11-07)
		Arago became professor of analytical geometry at the école Polytechnique in Paris at the age of 23.
		Arago was director of the Observatoire de Paris from 1843-1853 and discovered the Sun's chromosphere.
		Arago was a firm republican and was minister of war and marine in the provisional government which took power after the 1848 Revolution.
	www.truephysics.com /history/physicists/arago.html (413 words)

	ipedia.com: François Arago Article (Site not responding. Last check: 2007-11-07)
		François Jean Dominique Arago was a Catalan French mathematician, physicist, astronomer, and politician.
		Early life Arago was born at Estagel, a small village near Perpignan, in the département of Pyr...
		François Jean Dominique Arago (February 26, 1786 – October 2, 1853) was a Catalan French mathematician, physicist, astronomer, and politician.
	www.ipedia.com /francois_arago.html (2061 words)

	Arago (Site not responding. Last check: 2007-11-07)
		Arago made early discoveries on the corpuscular theory of light in 1811.
		Arago carried out further experiments of this type and demonstrated several effects which led Faraday later to explain them as induction.
		Working with Biot Arago made measurements of arc length on the Earth which led to the standardisation of the metric system of lengths.
	www-groups.dcs.st-and.ac.uk /~history/Mathematicians/Arago.html (361 words)

	Poisson/Arago Bright Spot Story (Site not responding. Last check: 2007-11-07)
		Using Fresnel's theory, Poisson deduced the seemingly absurd prediction that a bright spot should appear behind a circular obstruction, a prediction he felt was the last nail in the coffin for Fresnel's theory.
		However, Dominique Arago, another member of the judging committee, almost immediately verified the spot experimentally.
		Fresnel won the competition, and, although it may be more appropriate to call it "the Spot of Arago," the spot goes down in history with the name "Poisson's bright spot" like a curse.
	www.physics.ucla.edu /~dauger/fresnel/PoissonAragoStory.html (175 words)

	Arago spot
		An Arago spot is a bright point which, owing to diffraction, appears at the center of the shadow of a circular object in light from a point source[?].
		Siméon Poisson deduced from Augustin Fresnel's theory the necessity of a bright spot at the centre of the shadow of a circular opaque obstacle.
		With this counterintuitive result Poisson hoped to disprove the wave theory; however Dominique Arago experimentally verifed the prediction and today the demonstration goes by the name "Poisson's (Arago's) spot".
	www.fastload.org /ar/Arago_spot.html (143 words)

	Arago's Disk (Site not responding. Last check: 2007-11-07)
		The French physicist, Dominique Arago (1786-1853) discovered this effect in 1825 while studying the observation that the proximity of a piece of copper to a compass needle reduces the effect of the earth's magnetic field on the needle.
		The Smithsonian apparatus is by Queen and cost $16.50 in 1889.
		The example at the right of Arago's Wheel from the Garland Collection of Classical Physics Apparatus at Vanderbilt University is unmarked.
	physics.kenyon.edu /EarlyApparatus/Electricity/Aragos_Disk/Aragos_Disk.html (212 words)

	ARAGO, J, NARRATIVE OF A VOYAGE ROUND THE WORLD, in the Uranie and Physicienne Corvettes, Commanded by Captain ... (Site not responding. Last check: 2007-11-07)
		Arago wrote much of Narrative of a Voyage Round the World "in the form of letters to a friend, possibly his brother" (Forbes), the astronomer François Dominique Arago.
		Jacques Arago, that no one showed himself to be more patient, or more bold, or more intelligent, either to face the storms, or to endure the cruelest deprivations.
		Arago's drawings of subjects encountered in these places, twenty-five of which are found in Narrative of a Voyage Round the World, were highly praised in the official report to the French Academy of Sciences: "The collection of drawings which Captain Freycinet has brought home from his voyage round the world.
	www.polybiblio.com /bibliotrek/BT000064.html (583 words)

	References for Arago (Site not responding. Last check: 2007-11-07)
		L M Dougherty and A Dollfus, F D Arago's polarimeter and his original observation of extraterrestrial polarisation in 1811 (1989).
		I Howard-Duff, D F J Arago, 1786-1853, The Journal of the British Astronomical Association 97 (1986), 26-29.
		P Tucci, The Arago - Faraday controversy concerning electromagnetic induction (Italian), in Science and philosophy (Milan, 1985, 796-808.
	www-groups.dcs.st-and.ac.uk /~history/References/Arago.html (131 words)

	No. 691: Francois Arago and Watt
		Arago was born on the eve of the French Revolution.
		Arago's lecture is one the French Academy isn't ready for.
		Arago's initials were D.F.J. This volume also includes Arago's rejoinder, "On Machinery Considered...
	www.uh.edu /admin/engines/epi691.htm (485 words)

	The Science Bookstore - Chronology (Site not responding. Last check: 2007-11-07)
		Arago, F. Francois Arago discovers that some quartz crystals will continuously rotate the electric vector of light
		Arago, F. Francois Arago verifies the existence of the Poisson bright spot
		Full details of the discovery were published 19 August 1839, loosened somewhat by the promise of a pension of 6000 franks to Daguerre (and 4000 to Isidore Niepce).
	www.thesciencebookstore.com /chron.asp?searchstring=Arago (148 words)

	No. 704: A Tale of Three Scientists
		When he came back in 1809 he found lodging with the third and youngest member of this remarkable trio.
		That was François Arago -- a 23-year-old astronomy professor.
		And it all traced to an act of simple courtesy between Humboldt and Gay-Lussac, celebrated by Arago.
	www.uh.edu /engines/epi704.htm (473 words)

	AllRefer.com - Dominique FranCois Arago (Physics, Biography) - Encyclopedia
		AllRefer.com - Dominique FranCois Arago (Physics, Biography) - Encyclopedia
		You are here : AllRefer.com > Reference > Encyclopedia > Physics, Biographies > Dominique FranCois Arago
		Dominique FranCois Arago[dOmEnEk´ frANswA´ ArAgO´] Pronunciation Key, 1786–1853, French physicist and astronomer.
	reference.allrefer.com /encyclopedia/A/Arago-Do.html (175 words)

	Arago summary
		Arago was an important French mathematician and politician.
		He made important discoveries on the corpuscular theory of light
		Boulevard Arago, Jardins Arago and Square Arago (13th Arrondissement)
	www-history.mcs.st-andrews.ac.uk /Mathematicians/Arago.html (35 words)

Try your search on: Qwika (all wikis)