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Magnetic phenomenon
Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect
Arago's_rotations
French physicist and astronomer (1786–1853)
François Jean Arago (Catalan: Domènec Francesc Joan Aragó), known simply as François Arago (French: [fʁɑ̃swa aʁaɡo]; Catalan: Francesc Aragó, IPA: [fɾənˈsɛsk
François_Arago
Topics referred to by the same term
Talpa Arago, a manga series written by Takahiro Arai. Arago spot, optical phenomenon Aragoscope, a type of telescope design Arago's rotations, magnetic
Arago
Form of damping involving magnets and electrical conductors
and galvanometers Near critical damping at cryogenic temperatures Arago's rotations observed in 1824 Eddy current brake "Magnetic damping". www.britannica
Magnetic_damping
Early polyphase motor
entitled, "A Mode of Producing Arago's Rotations." Before Baily's invention, the only mode of producing the Arago-rotations of a copper disk had been by
Walter_Baily's_Motor
Type of AC electric motor
1824, the French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago's rotations. By manually turning switches on
Induction_motor
Resultant magnetic field
physicist François Arago formulated the existence of rotating magnetic fields using a rotating copper disk and a needle, termed "Arago's rotations." English experimenters
Rotating_magnetic_field
Machine that converts electrical energy into mechanical energy
1824, French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago's rotations, which, by manually turning switches
Electric_motor
Retrieved 2026-03-30. Baily, Walter (June 28, 1879). "A Mode of Producing Arago's Rotation". Philosophical Magazine. 3 (1). Taylor & Francis: 115. Bibcode:1879PPSL
Timeline of the electric motor
Timeline_of_the_electric_motor
Ferraris published another discussion of the theory of these motors. Arago's Rotations Timeline of the Electric Motor Rotating magnetic Field Induction Motor
Ferraris'_motor
English mathematician, philosopher, and engineer (1791–1871)
Wallace. With Herschel, Babbage worked on the electrodynamics of Arago's rotations, publishing in 1825. Their explanations were only transitional, being
Charles_Babbage
Observatory in London, England
1825 Arago won the Copley Gold Medal for this research (see also Arago's rotations). The observatory buildings at Greenwich became a museum of astronomical
Royal_Observatory,_Greenwich
will tend to retard the motion of the disc. This effect was termed Arago's rotations. Futile attempts were made by Charles Babbage, Peter Barlow, John
History of electromagnetic theory
History_of_electromagnetic_theory
Rotation of the plane of linearly polarized light as it travels through a chiral material
les rotations que certaines substances impriment aux axes de polarisation des rayons lumineux" (Extract from a memoir on the [optical] rotations that
Optical_rotation
Asteroid
Arago (minor planet designation: 1005 Arago), provisional designation 1923 OT, is a dark asteroid from the outer regions of the asteroid belt, approximately
1005_Arago
Eighth planet from the Sun
and he had loyal support in this from the observatory director, François Arago. This suggestion met with stiff resistance outside France. French almanacs
Neptune
who contributed important work on the planet: Galle, Le Verrier, Lassell, Arago, and Adams. Neptune also has a faint unnamed ring coincident with the orbit
Rings_of_Neptune
Meridian line in Paris, France
François Arago, whose name now appears on the plaques or medallions tracing the route of the meridian through Paris (see below). Biot and Arago published
Paris_meridian
1846 discovery of Neptune through mathematically-predicted observation
and dramatic confirmation of Newtonian gravitational theory. In François Arago's apt phrase, Le Verrier had discovered a planet "with the point of his pen"
Discovery_of_Neptune
French physicist
increased until, at 12.6 rotations per second, the returning light hit the next tooth and could not be seen. At 25.2 rotations per second, the light was
Hippolyte_Fizeau
Loops of electric current induced within conductors by a changing magnetic field
their inductance. The first person to observe eddy currents was François Arago (1786–1853). In 1824 he observed what has been called rotatory magnetism
Eddy_current
Main-belt asteroid
astronomer Laurent Bernasconi. Lightcurve analysis gave a longer-than-average rotation period of 32.79 hours with a brightness amplitude of 0.17 magnitude. As
1006_Lagrangea
Leslie cube John Leslie Discovery Emissivity of surfaces 1819 Arago spot experiment François Arago Confirmation Fresnel diffraction due to circular object 1838
List of experiments in physics
List_of_experiments_in_physics
Main-belt asteroid
obtained by IRAS. A rotational lightcurve of Belopolskya, obtained by Italian amateur astronomer Silvano Casulli in July 2010, gave a rotation period of 9.44
1004_Belopolskya
French mathematician and physicist (1781–1840)
thermodynamics, elasticity, and fluid mechanics. Moreover, he predicted the Arago spot in his attempt to disprove the wave theory of Augustin-Jean Fresnel
Siméon_Denis_Poisson
containing no coils or magnets, making them rugged and capable of high rotation speeds. This makes them suitable for their only widespread use, in guided
Flux_switching_alternator
Electromagnetic radiation humans can see
Arago created an experiment that showed the bright spot: Poisson's challenge became new evidence for the wave theory. In 1818, Young wrote to Arago suggesting
Light
Atmospheric electrical phenomenon
researcher William Snow Harris in 1843, and French Academy scientist François Arago in 1855. This hypothesis suggests that ball lightning consists of vaporized
Ball_lightning
Scientific instrument used to measure the speed of light
this method to measure the velocity of electricity in a wire. François Arago proposed the idea that Wheatstone's method could be adapted to a study of
Foucault's measurements of the speed of light
Foucault's_measurements_of_the_speed_of_light
English chemist and physicist (1791–1867)
influenced by the ongoing research of fellow European scientists Ampere, Arago, and Oersted as indicated by his diary entries. Cantor, pp. 235–244. Gooding
Michael_Faraday
Hungarian and American mathematician and physicist (1903–1957)
using area-preserving affine transformations instead of translations and rotations. The result depended on finding free groups of affine transformations
John_von_Neumann
Measure of the electric polarizability of a dielectric material
which induces periodic rotations. For example, at the microwave frequency, the microwave field causes the periodic rotation of water molecules, sufficient
Permittivity
Periodic comet
Lerebours telescope of 24.4 cm (9.6 in) aperture by the astronomer François Arago. Arago recorded polarimetric observations of Halley, and suggested that the
Halley's_Comet
Moon of Saturn
Philosophical Transactions of the Royal Society of London, Vol. 80, reported by Arago, M. (1871). "Herschel". Annual Report of the Board of Regents of the Smithsonian
Mimas
Obsolete postulated medium for the propagation of light
Taylor Whittaker (1910) and Jakob Laub (1910): The experiment of François Arago (1810), to confirm whether refraction, and thus the aberration of light
Luminiferous_aether
English physicist (1818–1889)
was proposing a kinetic theory of heat (he believed it to be a form of rotational, rather than translational, kinetic energy), and this required a conceptual
James_Prescott_Joule
Martian crater
Prosper Henry, both of whom were French telescope makers and astronomers. Arago crater is to the east of Henry, Barth crater is to the southeast, and Pasteur
Henry_(Martian_crater)
Early attempt to explain constant speed of light
day or between seasons. All Arago observed was ordinary stellar aberration. In 1818, Augustin-Jean Fresnel examined Arago's results using a wave theory
Aether_drag_hypothesis
History of research by Augustin-Jean Fresnel
Arago protested, declaring that he had made some of the same discoveries but had not had time to write them up. In fact the overlap between Arago's work
Fresnel's_physical_optics
Theory of interwoven space and time by Albert Einstein
translations without rotation, that is, Lorentz boosts, in the x-direction) with all other translations, reflections, and rotations between any Cartesian
Special_relativity
Measurement method using interference of waves
François Arago. Between 1816 and 1818, Fresnel and Arago performed interference experiments at the Paris Observatory. During this time, Arago designed
Interferometry
Production of voltage by a varying magnetic field
B" in the figure). The rim thus becomes an electromagnet that resists rotation of the disc (an example of Lenz's law). On the far side of the figure,
Electromagnetic_induction
Property of space that quantifies the magnetic influence at a given location
direction relative to each other. The force is particularly sensitive to rotations of the magnets due to magnetic torque. The force on each magnet depends
Magnetic_field
Speed of electromagnetic waves
the speed of light in air versus water, based on a suggestion by François Arago. Today, using oscilloscopes with time resolutions of less than one nanosecond
Speed_of_light
Ability of magnetization
in magnets on one's refrigerator. For gyromagnetic media (see Faraday rotation) the magnetic permeability response to an alternating electromagnetic field
Permeability (electromagnetism)
Permeability_(electromagnetism)
Electric current that periodically reverses direction
machine would have 36 coils (10° spacing). The advantage is that lower rotational speeds can be used to generate the same frequency. For example, a 2-pole
Alternating_current
Type of potential in electrodynamics
deviations in orbits of satellites, moons or planets. The anomalies in the rotation curves of more than one hundred spiral galaxies of different types could
Retarded_potential
Swiss mathematician (1707–1783)
called Euler "the greatest virtuoso of the period". Mathematician François Arago said, "Euler calculated without any apparent effort, just as men breathe
Leonhard_Euler
Statement on equilibrium in electromagnetism
in orientations antiparallel to magnetic fields (at least not without rotation—see spin-stabilized magnetic levitation. Earnshaw's theorem was originally
Earnshaw's_theorem
Equations describing classical electromagnetism
formalism below, the work of Oliver Heaviside, has become standard. It is rotationally invariant, and therefore mathematically more transparent than Maxwell's
Maxwell's_equations
French mathematician (1752–1833)
gamma functions along with their applications to mechanics – such as the rotation of the earth, and the attraction of ellipsoids – appeared in the second
Adrien-Marie_Legendre
Type of AC electrical generator
poles on stator) powered by a 60 Hz source, the synchronous speed is 1800 rotations per minute (rpm) and 1500 RPM powered at 50 Hz. The motor always turns
Induction_generator
Force acting on charged particles in electric and magnetic fields
six degrees of freedom corresponding to boosts (rotations in spacetime planes) and rotations (rotations in space-space planes). The dot product with the
Lorentz_force
Motor which works on direct current
Homopolar motor – A homopolar motor has a magnetic field along the axis of rotation and an electric current that at some point is not parallel to the magnetic
DC_motor
Optical phenomenon
cannot form an interference pattern, even if rotated into alignment (Fresnel–Arago 3rd law). A so-called depolarizer acts on a polarized beam to create one
Unpolarized_light
Electrically insulating substance able to be polarised by an applied electric field
rotates. This rotation occurs on a timescale that depends on the torque and surrounding local viscosity of the molecules. Because the rotation is not instantaneous
Dielectric
Natural satellite orbiting Saturn
Bibcode:1795RSPT...85..347H. doi:10.1098/rstl.1795.0021. S2CID 186212450. (reported by Arago, M. (1871). "Herschel". Annual Report of the Board of Regents of the Smithsonian
Enceladus
French optical physicist (1788–1827)
principle Linear polarization Optical rotation Phasor Physical crystallography before X-rays Physical optics Poisson's /Arago's spot Polarization Ridged mirror
Augustin-Jean_Fresnel
Mathematical model combining space and time
group, which is a ten-dimensional group of three Lorentz boosts, three rotations, and four spacetime translations. It is logical to ask what symmetries
Spacetime
History of physical crystallography to 1895
Friedrich Pockels (1906). In 1811 François Arago, who favoured the corpuscular theory of light, discovered the rotation of the plane of polarization of light
Physical crystallography before X-rays
Physical_crystallography_before_X-rays
between Shetland and the Balearic Islands by the French astronomers François Arago and Jean-Baptiste Biot. In 1821 they published their work as a fourth volume
History_of_geodesy
Volcanic region hotter than the surrounding mantle
O'Neill, C.; Müller, R. D.; Steinberger, B. (2003). "Revised Indian plate rotations based on the motion of Indian Ocean hotspots" (PDF). Earth and Planetary
Hotspot_(geology)
Lagrange Pierre-Simon Laplace Augustin-Jean Fresnel Jean-Yves Le Gall François Arago Philippe Baptiste French spationauts Companies and organisations CNES European
French_space_programme
measurement is correct to the first two significant figures. 1810 – François Arago observes that the speed of light of stars – measured with stellar aberration
Timeline of special relativity and the speed of light
Timeline_of_special_relativity_and_the_speed_of_light
physique et de chimie de la Société d'Arcueil. (in French). 2: 143–158. Arago F (1811). "Me´moire sur une modification remarquablequ'e´prouvent les rayons
Chirality_timeline
Geometric figure which approximates the Earth's shape
geographical poles, is approximately aligned with the Earth's axis of rotation. The ellipsoid is also defined by the major axis (equatorial axis); the
Earth_ellipsoid
Compact composite lens
"temporarily" seconded to the commission on the recommendation of François Arago (a member since 1813), to review possible improvements in lighthouse illumination
Fresnel_lens
Plantation estate of George Washington
cropping experiments, which were elaborate and included complex field rotations, nitrogen fixing crops and a range of soil amendments. The Washington
Mount_Vernon
Charge transfer due to contact or sliding
material to the other. This is a fermionic analog of the mechanism of rotational superradiance originally described by Yakov Zeldovich for bosons. Electrons
Triboelectric_effect
Albert Einstein's hypothetical situations to argue scientific points
approximations to modern quantum mechanical treatments. The 1819 observation of the Arago spot (a bright point at the center of a circular object's shadow due to
Einstein's thought experiments
Einstein's_thought_experiments
dipole currently tilted at an angle of about 11° with respect to Earth's rotational axis, as if there were an enormous bar magnet placed at that angle through
Earth's_magnetic_field
American astronomer (1829–1907)
determined the orbits of satellites of other planets and of double stars, the rotation of Saturn, and the mass of Mars. Hall was born in Goshen, Connecticut,
Asaph_Hall
Law of classical electromagnetism
= μ H {\displaystyle \mathbf {B} =\mu \mathbf {H} } was essentially a rotational analogy to the linear electric current relationship, Electric convection
Biot–Savart_law
French polymath (1749–1827)
diffraction to a commission of the French Academy with the help of François Arago. Laplace was one of the commission members and they ultimately awarded a
Pierre-Simon_Laplace
Model of electrically conducting fluids
Science. 19 September 2013. "Earth's contrasting inner core rotation and magnetic field rotation linked". 7 October 2013. "Geodynamo". NOVA | Magnetic Storm
Magnetohydrodynamics
Object that reflects an image
ITT-JEE, Volume 2 By S. Chand & Co. 2012 Er. Rakesh Rathi Page 273--276 Arago, François; Lardner, Dionysius (1845). Popular Lectures on Astronomy: Delivered
Mirror
Italian politician and physicist (1811–1868)
of physics at the local college. In 1840, by recommendation of François Arago (1786–1853), his teacher at the École Polytechnique, to the Grand-Duke of
Carlo_Matteucci
First ironclad of the US Navy, 1861–1862
Smithsonian National Postal Museum. An image of the stamp is available at Arago: people, postage & the post online, Monitor*Virginia stamp[link removed]
USS_Monitor
Complete reflection of a wave
established that one case studied by Arago, namely quartz cut perpendicular to its optic axis, was actually a gradual rotation of the plane of polarization with
Total_internal_reflection
Geodetic survey from 1792 to 1798
rédigé par MM. Biot et Arago,... pp. viii–ix.{{cite book}}: CS1 maint: numeric names: authors list (link) Biot, Jean-Baptiste; Arago, François (1821). Recueil
Arc measurement of Delambre and Méchain
Arc_measurement_of_Delambre_and_Méchain
Property of waves that can oscillate with more than one orientation
cannot form an interference pattern, even if rotated into alignment (Fresnel–Arago 3rd law). A so-called depolarizer acts on a polarized beam to create one
Polarization_(waves)
Physical phenomenon in electromagnetic field theory
Stress–energy tensor Synchrotron radiation Bremsstrahlung Scientists Ampère Arago Biot Coulomb Davy Einstein Faraday FitzGerald Fizeau Franklin Galvani Gauss
Relativistic_electromagnetism
Smart fluid whose viscosity increases in a magnetic field
Shear mode is particularly useful in clutches and brakes, in places where rotational motion must be controlled. Squeeze-flow mode, on the other hand, is most
Magnetorheological_fluid
induction current causes a magnetic current density B = μ H was essentially a rotational analogy to the linear electric current relationship, Electric convection
History of Maxwell's equations
History_of_Maxwell's_equations
English mathematician and priest
Algebra, Conic Sections – Newton. 1857 Translation of Arago's Autobiography. 1857 Translations of Arago's Lives of Young, Malus, and Fresnel, with Optical
Baden_Powell_(mathematician)
Phenomenon wherein objects appear to move about their true positions in the sky
this result deviates even more from the vacuum result. In 1810 François Arago performed a similar experiment and found that the aberration was unaffected
Aberration_(astronomy)
Dutch mathematician and physicist (1629–1695)
However, Thomas Young's interference experiments in 1801, and François Arago's detection of the Poisson spot in 1819, could not be explained through Newton's
Christiaan_Huygens
Polarization pattern of the daytime sky
points. These conditions are met at a few defined locations on the sky. The Arago point is located above the antisolar point, while the Babinet and Brewster
Rayleigh_sky_model
naturalist, physician and political figure, founder of Cytochemistry. François Arago, important mathematician, astronomer and physicist. Jean Pierre Flourens
List_of_Occitans
Concept in physics
new theory of magnetic attractions, and to the theory of the magnetic rotation of the plane of polarization of light" (part 2), American Journal of Mathematics
Magnetomotive_force
Resistance to magnetic flux
new theory of magnetic attractions, and to the theory of the magnetic rotation of the plane of polarization of light" (part 2), American Journal of Mathematics
Magnetic_reluctance
Concept in the physics of electromagnetism
Einstein–de Haas effect, or "rotation by magnetization", and its inverse, the Barnett effect, or "magnetization by rotation". Further, a torque applied
Magnetic_moment
British chemist and inventor (1778–1829)
Faraday's first major discovery independent of Davy, of electromagnetic rotation (the first electric motor). According to Geoffrey Cantor's 1991 biography
Humphry_Davy
Lighthouse
to rotate the Fresnel lens, and was eventually automated in 1966. The rotation mechanism served in the light for 89 years before it finally broke down
Umpqua_River_Light
Complex vector of electromagnetic fields
from the spin of the length 1 matrices generating full infinitesimal rotations of 3-spinor particle. One may therefore notice that the Hamiltonian in
Riemann–Silberstein_vector
Optical prism
established that one case studied by Arago, namely quartz cut perpendicular to its optic axis, was actually a gradual rotation of the plane of polarization with
Fresnel_rhomb
Record of humanity's attempts to find east-west position on Earth
transmit a time signal for longitude determination was suggested by François Arago to Morse in 1837, and the first test of this idea was made by Capt. Wilkes
History_of_longitude
Bridge category
2019.{{cite web}}: CS1 maint: bot: original URL status unknown (link) Arago, François (1855). "Sur les chaux, les mortiers et les ciments hydrauliques
Masonry_bridge
a wave in his double-slit experiment. Arago spot (1819): Observation of circular diffraction by François Arago, validated a new wave theory of light by
List_of_experiments
Measure of positive and negative charges
the total dipole moment have contributions coming from translations and rotations of the molecules in the sample, M Tot = M Trans + M Rot . {\displaystyle
Electric_dipole_moment
travel, tourism, insurance
ARAGOS ROTATIONS
ARAGOS ROTATIONS
Male
Finnish
Pet form of Finnish Aatami, AATOS means "earth" or "red."
Boy/Male
Hebrew
Lofty; exalted; high mountain.
Boy/Male
Latin
Name of a Greek author.
Boy/Male
Australian, Greek
Vigilant Guardian; Shining
Boy/Male
German, Teutonic
Famous Holiness
Boy/Male
Australian, French, German, Italian, Latin, Slovenia
Dragon
Surname or Lastname
English
English : variant of Bragg.
Boy/Male
Latin
From the Arar.
Boy/Male
Belgium, Indian, Portuguese
Removes Darkness by Bringing Light; Turning Around
Boy/Male
Greek Danish
Vigilant.
Male
Italian
 Italian form of Latin Draco, DRAGO means "dragon." Compare with another form of Drago.
Boy/Male
French
Fictional swordsman: (ambitious and filled with religious aspirations) from Alexander Dumas's...
Male
Serbian
(Serbian Драго): Slavic name derived from the word drago DRAGO means "precious." In use by the Croatians, Serbians, Slovenes. Compare with another form of Drago.
Boy/Male
Australian, French
Fictional Swordsman; Ambitious and Filled with Religious Aspirations; From Alexander Dumas's Three Musketeers
Boy/Male
Shakespearean
The Merchant of Venice' The Prince of Arragon, suitor to Portia. 'Much Ado About Nothing' Don...
Male
Greek
(Ἄδαμος) Greek form of Hebrew Adam according to Josephus, ADAMOS means "the red earth."
Boy/Male
Greek
Son of Zeus.
Boy/Male
Greek
Strength.
Boy/Male
Greek
All seeing.
Male
Greek
(ΆÏγος) Greek name derived from the word argos, ARGOS means "bright, shining" and "swift." In mythology, this is the name of a giant who had a hundred eyes that were transferred to the peacock's tail after his death. This was also the name of Ulysses' dog who waited ten years for his return from the Trojan War.Â
ARAGOS ROTATIONS
ARAGOS ROTATIONS
ARAGOS ROTATIONS
ARAGOS ROTATIONS
ARAGOS ROTATIONS
ARAGOS ROTATIONS
ARAGOS ROTATIONS
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