- George Biddell Airy
box_width = 300px
name = Sir George Biddell Airy, FRS
image_width = 240px
birth_date = birth date|1801|07|27
Alnwick, Northumberland, England
death_date = death date and age|1892|01|02|1801|07|27
Greenwich, London, England
University of Cambridge Royal Society
Colchester Royal Grammar School Trinity College, Cambridge
Pierce Morton William Sealy Gosset
prizes = RAS Gold Medal,
Sir George Biddell Airy FRS (27 July 1801–2 January 1892) was an English
mathematicianand astronomer, Astronomer Royalfrom 1835 to 1881. His many achievements include work on planetary orbits, measuring the mean density of the Earth, a method of solution of two-dimensional problems in solid mechanicsand, in his role as Astronomer Royal, establishing Greenwichat the location of the prime meridian. His reputation has been tarnished by allegations that, through his inaction, Britain lost the opportunity of priority in the discovery of Neptune.
Airy was born at
Alnwick, one of a long line of Airys who traced their descent back to a family of the same name residing at Kentmere, in Westmorland, in the 14th century. The branch to which he belonged, having suffered in the English Civil War, moved to Lincolnshireand became farmers. George Airy was educated first at elementary schools in Hereford, and afterwards at Colchester Royal Grammar School.cite encyclopedia | title=Sir George Biddell Airy | encyclopedia=Encyclopaedia Britannica | location=Cambridge | publisher=Cambridge University Press | year=1911 | url=http://www.1911encyclopedia.org/Sir_George_Biddell_Airy | location=Cambridge | publisher=Cambridge University Press| year=1911 | oclc=70608430 | accessdate=2008-02-24] An introverted child, Airy gained popularity with his schoolmates through his great skill in the construction of peashooters. [MacTutor|id=Airy|title=George Biddell Airy]
In 1819 he entered
Trinity College, Cambridge, as a sizar, meaning that he paid a reduced fee but essentially worked as a servant to make good the fee reduction. Here he had a brilliant career, and seems to have been almost immediately recognized as the leading man of his year. In 1822 he was elected scholar of Trinity, and in the following year he graduated as senior wranglerand obtained first Smith's prize. On October 1 1824he was elected fellow of Trinity, and in December 1826 was appointed Lucasian professor of mathematicsin succession to Thomas Turton. This chair he held for little more than a year, being elected in February 1828 Plumian professor of astronomyand director of the new Cambridge observatory.
Some idea of his activity as a writer on mathematical and physical subjects during these early years may be gathered from the fact that previous to this appointment he had contributed no less than three important memoirs to the "Philosophical Transactions" of the
Royal Society, and eight to the Cambridge Philosophical Society. At the Cambridge observatory Airy soon showed his power of organization. The only telescopein the establishment when he took charge was the transit instrument, and to this he vigorously devoted himself. By the adoption of a regular system of work, and a careful plan of reduction, he was able to keep his observations up to date, and published them annually with a punctuality which astonished his contemporaries. Before long a mural circlewas installed, and regular observations were instituted with it in 1833. In the same year the Duke of Northumberland presented the Cambridge observatory with a fine object-glass of 12-inch aperture, which was mounted according to Airy's designs and under his superintendence, although construction was not completed until after he moved to Greenwichin 1835.
Airy's writings during this time are divided between mathematical physics and astronomy. The former are for the most part concerned with questions relating to the theory of
lightarising out of his professorial lectures, among which may be specially mentioned his paper "On the Diffraction of an Object-Glass with Circular Aperture," and his enunciation of the complete theory of the rainbow. In 1831 the Copley Medalof the Royal Society was awarded to him for these researches. Of his astronomical writings during this period the most important are his investigation of the mass of Jupiter, his report to the British Associationon the progress of astronomy during the 19th century, and his work "On an Inequality of Long Period in the Motions of the Earthand Venus".
One of the sections of his able and instructive report was devoted to "A Comparison of the Progress of Astronomy in
Englandwith that in other Countries," very much to the disadvantage of England. This reproach was subsequently to a great extent removed by his own labours.
Airy's discovery of a new inequality in the motions of Venus and the Earth is in some respects his most remarkable achievement. In correcting the elements of Delambre's
solar tables he had been led to suspect an inequality overlooked by their constructor. The cause of this he did not long seek in vain; eight times the mean motion of Venus is so nearly equal to thirteen times that of the earth that the difference amounts to only a small fraction of the earth's mean motion, and from the fact that the term depending on this difference, although very small in itself, receives in the integration of the differential equations a multiplier of about 2,200,000, Airy was led to infer the existence of a sensible inequality extending over 240 years ("Phil. Trans." cxxii. 67). The investigation was probably the most laborious that had been made up to Airy's time in planetary theory, and represented the first specific improvement in the solar tables effected in England since the establishment of the theory of gravitation. In recognition of this work the Gold Medal of the Royal Astronomical Societywas awarded to him in 1833 (he would win it again in 1846).
In June 1835 Airy was appointed
Astronomer Royalin succession to John Pond, and began his long career at the national observatory which constitutes his chief title to fame. The condition of the observatory at the time of his appointment was such that Lord Auckland, the first Lord of the Admiralty, considered that "it ought to be cleared out," while Airy admitted that "it was in a queer state." With his usual energy he set to work at once to reorganize the whole management. He remodelled the volumes of observations, put the library on a proper footing, mounted the new (Sheepshanks) equatorialand organized a new magnetic observatory. In 1847 an altazimuthwas erected, designed by Airy to enable observations of the moonto be made not only on the meridian, but whenever it might be visible. In 1848 Airy invented the reflex zenith tubeto replace the zenith sectorpreviously employed. At the end of 1850 the great transit circle of 203 mm (8 inch) aperture and 3.5 m (11 ft 6 in) focal lengthwas erected, and is still the principal instrument of its class at the observatory. The mounting in 1859 of an equatorial of 330 mm (13 inch) aperture evoked the comment in his journal for that year, "There is not now a single person employed or instrument used in the observatory which was there in Mr Pond's time"; and the transformation was completed by the inauguration of spectroscopicwork in 1868 and of the photographic registration of sunspotsin 1873.
The formidable undertaking of reducing the accumulated planetary observations made at Greenwich from 1750 to 1830 was already in progress under Airy's supervision when he became Astronomer Royal. Shortly afterwards he undertook the further laborious task of reducing the enormous mass of observations of the moon made at Greenwich during the same period under the direction, successively, of
James Bradley, Nathaniel Bliss, Nevil Maskelyneand John Pond, to defray the expense of which a large sum of money was allotted by the Treasury. As a result, no less than 8,000 lunar observations were rescued from oblivion, and were, in 1846, placed at the disposal of astronomers in such a form that they could be used directly for comparison with the theory and for the improvement of the tables of the moon's motion.
For this work Airy received in 1848 a testimonial from the
Royal Astronomical Society, and it at once led to the discovery by Peter Andreas Hansenof two new inequalities in the moon's motion. After completing these reductions, Airy made inquiries, before engaging in any theoretical investigation in connection with them, whether any other mathematician was pursuing the subject, and learning that Hansen had taken it in hand under the patronage of the king of Denmark, but that, owing to the death of the king and the consequent lack of funds, there was danger of his being compelled to abandon it, he applied to the admiralty on Hansen's behalf for the necessary sum. His request was immediately granted, and thus it came about that Hansen's famous "Tables de la Lune" were dedicated to "La Haute Amirauté de sa Majesté la Reine de la Grande Bretagne et d'Irlande".
In 1851 Airy established a new
Prime Meridianat Greenwich. This line, the fourth "Greenwich Meridian," became the definitive internationally recognised line in 1884.
earch for Neptune
In June 1846, Airy started corresponding with French astronomer
Urbain Le Verrierover the latter's prediction that irregularities in the motion of Uranuswere due to a so-far unobserved body. Aware that Cambridge Astronomer John Couch Adamshad suggested that he had made similar predictions, on 9 July Airy entreated James Challisto undertake a systematic search in the hope of securing the triumph of discovery for Britain. Ultimately, a rival search in Berlinby Johann Gottfried Galle, instigated by Le Verrier, won the race for priority.Chapman (2006)] Though Airy was "abused most savagely both by English and French"cite book | first=George Biddell | last=Airy | coauthors=Airy, Wilfrid | title=The Autobiography of Sir George Biddell Airy | publisher=Cambridge University Press | year=1896 | url=http://books.google.com/books?id=-mUSAAAAIAAJ&pg=PA342&dq=edward+maunder+astronomer&as_brr=1#PPR3,M2 | oclc=13130558 | accessdate=2008-02-24] for his failure to act on Adams's suggestions more promptly, there have also been claims that Adams's communications had been vague and dilatory and further that the search for a new planet was not the responsibility of the Astronomer Royal. [cite encyclopedia | author=Hutchins, R. | encyclopedia= Oxford Dictionary of National Biography| year=2004 | url=http://www.oxforddnb.com/view/article/123 | title=Adams, John Couch (1819–1892) | publisher=Oxford University Press | location=Oxford; New York | edition=Online Edition | oclc=56568095| accessdate=2008-02-24 ODNBsubODNBsub]
Mean density of the Earth
One of the most remarkable of Airy's researches was his determination of the
mean density of the Earth. In 1826, the idea occurred to him of attacking this problem by means of pendulumexperiments at the top and bottom of a deep mine. His first attempt, made in the same year, at the Dolcoath minein Cornwall, failed in consequence of an accident to one of the pendulums. A second attempt in 1828 was defeated by a flooding of the mine, and many years elapsed before another opportunity presented itself. The experiments eventually took place at the Harton pit near South Shieldsin 1854. Their immediate result was to show that gravity at the bottom of the mine exceeded that at the top by 1/19286 of its amount, the depth being 383 m (1,256 ft) From this he was led to the final value of Earth's specific densityof 6.566. [ [http://gallica.bnf.fr/ark:/12148/bpt6k55951k/f359.table Airy, G. B. (1856) "Philosophical Transactions of the Royal Society" 146:343-355] ] This value, although considerably in excess of that previously found by different methods, was held by Airy, from the care and completeness with which the observations were carried out and discussed, to be "entitled to compete with the others on, at least, equal terms."
Ether drag test
By means of a water-filled
telescope, Airy in 1871 looked for a change in stellar aberrationthrough the refracting water due to an ether drag. [ [http://gallica.bnf.fr/ark:/12148/bpt6k56114d/f79.table George Biddell Airy, “On the Supposed Alteration in the Amount of Astronomical Aberration of Light, Produced by the Passage of the Light through a Considerable Thickness of Refracting Medium,” "Proceedings of the Royal Society of London", V20, pp. 35-39 (1871-1872).] ] His null result suggested a lack of a universal ether.Fact|date=February 2008
In 1872 Airy conceived the idea of treating the lunar theory in a new way, and at the age of seventy-one he embarked on the prodigious toil which this scheme entailed. A general description of his method will be found in the "Monthly Notices" of the Royal Astronomical Society, vol. xxxiv, No. 3. It consisted essentially in the adoption of
Charles-Eugène Delaunay's final numerical expressions for longitude, latitude, and parallax, with a symbolic term attached to each number, the value of which was to be determined by substitution in the equations of motion.
In this mode of treating the question the order of the terms is numerical, and though the amount of labour is such as might well have deterred a younger man, yet the details were easy, and a great part of it might be entrusted to "a mere computer". (Note that at the time that this was written, the term "computer" referred to a human being who performed calculating work, either manually or with mechanical aids).
The work was published in 1886, when its author was eighty-five years of age. For some little time previously he had been harassed by a suspicion that certain errors had crept into the computations, and accordingly he addressed himself to the task of revision. But his powers were no longer what they had been, and he was never able to examine sufficiently into the matter. In 1890 he tells us how a grievous error had been committed in one of the first steps, and pathetically adds, "My spirit in the work was broken, and I have never heartily proceeded with it since."
tress function method
In 1862, Airy presented a new technique to determine the strain and stress field within a beam. [ [http://gallica.bnf.fr/ark:/12148/bpt6k559580/f66.table Airy, G. B. (1863) "Philosophical Transactions of the Royal Society", 153:49-80] ] This technique, sometimes called the , can be used to find solutions to many two-dimensional problems in
solid mechanics(see ). For example, it was used by H. M. Westergaard [Westergaard H. M. (1939). Bearing Pressures and Cracks, "Journal of Applied Mechanics" 6: 49-53. ] to determined the stress and strain field around a crack tip and thereby this method contributed to the development of fracture mechanics.
Tay Bridge Disaster
Airy was consulted about wind speeds and pressures likely to be encountered on the proposed Forth suspension bridge being designed by
Thomas Bouchfor the North British Railwayin the late 1870s. He thought that pressures no greater than about 10 pounds per square foot could be expected, a comment Bouch took to mean also applied to the first Tay railway bridge then being built. Much greater pressures however, can be expected in severe storms. Airy was called to give evidence before the Official Inquiry into the Tay Bridge disaster, and was criticised for his advice. However, little was known about the problems of wind resistance of large structures, and a Royal Commission on Wind Pressure was asked to conduct research into the problem. [Lewis (2004) "pp"115-116]
In July 1824, Airy met Richarda Smith (1804-1875), "a great beauty", on a walking tour of
Derbyshire. He later wrote, "Our eyes met ... and my fate was sealed ... I felt irresistibly that we must be united," and Airy proposed two days later. Richarda's father, the Revd Richard Smith, felt that Airy lacked the financial resources to marry his daughter. Only in 1830, with Airy established in his Cambridge position, was permission for the marriage granted. [Chapman (1998) and (2003)]
The Airys had nine children, the eldest three dying in childhood. The eldest survivor,
Wilfrid Airy, was the designer and engineerfor "Colonel" George Tomline's Orwell Park observatory. [Goward (2005)] Goward (2006)] Wilfrid's daughter was the artist Anna Airy.
Their eldest daughter, Hilda (1840–1916), married
Edward Routhin 1864. [Fuller, A. T. (2004) " [http://www.oxforddnb.com/view/article/35850 Routh, Edward John (1831–1907)] ", " Oxford Dictionary of National Biography", Oxford University Press, accessed 9 September 2007 ODNBsub]
Airy retired in 1881, living with his two married daughters at Croom's Hill near Greenwich. In 1891, he suffered a fall and an internal injury. He survived the consequential
surgeryonly a few days. His wealth at death was £27,713. Airy and his wife and three pre-deceased children are buried at St. Mary's Church in Playford, Suffolk. A cottage owned by Airy still stands, adjacent to the church and now in private hands. [A description and images of Airy's Suffolk cottage and church are found in Goward (2005)]
Legacy and honours
*The Martian crater Airy is named for him. [cite web | url=http://planetarynames.wr.usgs.gov/jsp/FeatureTypesData2.jsp?systemID=4&bodyID=8&typeID=9&system=Mars&body=Mars&type=Crater,%20craters&sort=AName&show=Fname&show=Lat&show=Long&show=Diam&show=Stat&show=Orig | work=Gazetteer of Planetary Nomenclature | title=Mars Nomenclature: Crater, craters | publisher=USGS: Astrogeology Research Program | accessdate=2007-08-16 ] Within that crater lies another smaller crater called
Airy-0whose location defines the prime meridianof that planet, as does the location of Airy's 1850 telescope for Earth. [cite book| title=Mapping Mars: Science, Imagination, and the Birth of a World| first=Oliver| last=Morton| publisher=Picador USA| location=New York| year=2002| isbn=0312245513| pages=22-23]
*There is also a
lunar craterAiry named in his honour. [cite book | author=Cocks, E. E. & Cocks, J. C. | year=1995 | title=Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature | publisher=Tudor Publishers | isbn=0936389273 ]
Airy wave theoryis the linear theory for the propagation of gravity waves on the surface of a fluid. [ Citation
last = Holthuijsen
first = Leo H.
year = 2007
title = Waves in oceanic and coastal waters
publisher = Cambridge University Press
isbn = 0521860288
location = Cambridge, p. 106.]
;By AiryA complete list of Airy's 518 printed papers is in Airy (1896). Among the most important are:
*Airy, G. B. (1826) "Mathematical Tracts on Physical Astronomy";
* (1828) "On the Lunar Theory, The Figure of the Earth, Precession and Nutation, and Calculus of Variations", to which, in the second edition of 1828, were added tracts on the "Planetary Theory" and the "Undulatory Theory of Light";
* (1839) "Experiments on Iron-built Ships, instituted for the purpose of discovering a correction for the deviation of the Compass produced-by the Iron of the Ships"; and
*(1861) "On the Algebraic and Numerical Theory of Errors of Observations and the Combination of Observations".
*cite encyclopedia | encyclopedia=Encyclopaedia Britannica | title=Sir George Biddell Airy | url=http://www.1911encyclopedia.org/Sir_George_Biddell_Airy | location=Cambridge | publisher=Cambridge University Press| year=1911 | oclc=70608430 | accessdate=2008-02-24
* [http://adsabs.harvard.edu//full/seri/MNRAS/0002//0000159.000.html Awarding of RAS gold medal, 1833: MNRAS 2 (1833) 159]
* [http://adsabs.harvard.edu//full/seri/MNRAS/0007//0000064.000.html Awarding of RAS gold medal, 1846: MNRAS 7 (1846) 64]
* [http://books.google.com/books?id=zMQEAAAAYAAJ Mathematical Tracts on the Lunar and Planetary Theories 4th edition] (London, McMillan, 1858)
* Full texts of some of the papers by Airy are available at " [http://gallica.bnf.fr Gallica: bibliothèque numérique de la Bibliothèque nationale de France] "
*E. J. R., "Proceedings of the Royal Society", 51 (1892), i–xii
The Times", 5 January 1892
*"East Anglian Daily Times", 11 January 1892
*"Suffolk Chronicle", 9 January 1892
*"Daily Times", 5 January 1892
*H. H. T. (1892) [http://adsabs.harvard.edu//full/seri/MNRAS/0052//0000212.000.html Obituary - Sir George Biddell Airy] , "Monthly Notices of the Royal Astronomical Society" 52: 212-229
*"Proceedings of the Institution of Civil Engineers", 108 (1891–2), 391–394
* [http://adsabs.harvard.edu//full/seri/AJ.../0011//0000096.000.html "Astronomical Journal" 11 (1892) 96]
* [http://adsabs.harvard.edu//full/seri/AN.../0129//0000021.000.html "Astronomische Nachrichten" 129 (1892) 33/34]
* [http://adsabs.harvard.edu//full/seri/Obs../0015//0000073.000.html "The Observatory" 15 (1892) 73]
NAME=Airy, George Biddell
ALTERNATIVE NAMES=Airey, George Biddell (alternate spelling)
SHORT DESCRIPTION=English astronomer
DATE OF BIRTH=
July 27, 1801
PLACE OF BIRTH=
Alnwick, London, England
DATE OF DEATH=
January 2, 1892
PLACE OF DEATH=
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George Biddell Airy — Sir George Biddell Airy (* 27. Juli 1801 in Alnwick, Northumberland; † 2. Januar 1892 in Greenwich) war ein englischer Mathematiker und Astronom. Er leistete bedeutende Beiträge zur Himmelsmechanik … Deutsch Wikipedia
George Biddell Airy — George Biddell Airy. George Biddell Airy (Alnwick, 27 de julio de 1801 Greenwich, 2 de enero de 1892) fue un astrónomo y matemático inglés. Profesor de astronomía en Cambridge (1826 1835), fue nombrado astrónom … Wikipedia Español
George Biddell Airy — Pour les articles homonymes, voir Airy. George Biddell Airy Naissance 27 juillet 1801 Alnwick, N … Wikipédia en Français
Airy, Sir George Biddell — ▪ British astronomer born July 27, 1801, Alnwick, Northumberland, Eng. died Jan. 2, 1892, Greenwich, London English scientist who was astronomer royal from 1835 to 1881. Airy graduated from Trinity College, Cambridge, in 1823. He… … Universalium
Airy , Sir George Biddell — (1801–1892) British astronomer Airy, the son of a tax collector, was born in Alnwick in the north east of England. He attended school in Colchester before going to Cambridge University in 1819. He met with early success, producing a mathematical… … Scientists
Airy, sir George Biddell — ► (1801 92) Astrónomo británico. Determinó, entre otras cosas, la longitud por medio del telégrafo eléctrico y la fecha de varios eclipses … Enciclopedia Universal
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