|
||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish mathematician and theoretical physicist. His most significant achievement was formulating a set of equations — eponymously named Maxwell's equations — that for the first time expressed the basic laws of electricity and magnetism in a unified fashion. He also developed the Maxwell distribution, a statistical means to describe aspects of the kinetic theory of gases. These two discoveries helped usher in the era of modern physics, laying the foundation for future work in such fields as special relativity and quantum mechanics. He is also known for creating the first true color photograph in 1861. The majority of Maxwell's illustrious career took place at the University of Cambridge, where his investigations often made use of his mathematical aptitude, drawing on elements of geometry and algebra. With these skills, Maxwell was able to demonstrate that electric and magnetic fields travel through space, in the form of waves, and at the constant speed of light. Finally, in 1861 Maxwell wrote a four-part publication in the Philosophical Magazine called On Physical Lines of Force where he first proposed that light was in fact undulations in the same medium that is the cause of electric and magnetic phenomena.
BiographyEarly life and educationJames Clerk Maxwell was born on June 13, 1831 in Edinburgh, Scotland, to John Clerk and Frances (née Cay) Maxwell. His birthplace, at 15 India Street, is now the location of the International Centre for Mathematical Sciences. It was at this time that physicist Michael Faraday was in the process of completing his work on magnetic induction, a concept upon which Maxwell would later build. Maxwell grew up on his father's estate in the Scottish countryside. He was encouraged by his father to pursue his scientific and mathematical interests. Maxwell entered college at the age of 16 and eventually graduated with high honors in mathematics. All indications suggest that Maxwell had maintained an unquenchable curiosity from an early age. By the age of three, everything that moved, shone, or made a noise drew the question: "what's the go o' that?".[1] In a letter to her sister Jane Cay in 1834, his mother describes this innate sense of inquisitiveness: He is a very happy man, and has improved much since the weather got moderate; he has great work with doors, locks, keys, etc., and 'show me how it doos' is never out of his mouth. He also investigates the hidden course of streams and bell-wires, the way the water gets from the pond through the wall...[2] Recognizing the potential of young Maxwell, his mother Frances took responsibility for his early education, which in Victorian times was largely the job of the women of the house. She became ill — probably with cancer — and died in 1839. His father, John Clerk Maxwell, undertook the education of his son, with the aid of his sister-in-law Jane Cay, both of whom played pivotal roles in the life of James. His formal education began, unsuccessfully, under the guidance of a hired tutor. Not much is known about the man James's father hired to instruct his son, except that he treated the younger Maxwell harshly. His educational philosophy was founded upon coercion, often physical. James never responded well to the tutor's instruction; he chided his student for being slow and wayward. After considerable searching, John Maxwell sent James to the Edinburgh Academy. His school nickname was "Daftie", earned when he arrived for his first day of school wearing home-made shoes.
Middle yearsImage:YoungJamesClerkMaxwell.jpg A young Maxwell at university. Maxwell left the Academy and began attending class at the University of Edinburgh. Having the opportunity to attend Cambridge after his first term, Maxwell decided instead to complete the full three terms of his undergraduate studies at Edinburgh. The main reason for this was that Cambridge was too far from home, and he would only have the opportunity to see his father twice a year. Another reason was Maxwell's concern for his future. He wanted to become a scientist, but jobs in science were rare at this time, and it would have been much more difficult to obtain a lecturing post at a university as prestigious as Cambridge. Accordingly, Maxwell completed his studies at Edinburgh in natural philosophy, moral philosophy, and mental philosophy under Sir William Hamilton, 9th Baronet. In his eighteenth year he contributed two papers for the Transactions of the Royal Society of Edinburgh — one of which, On the Equilibrium of Elastic Solids, laid the foundation for an important discovery of his later life: the temporary double refraction produced in viscous liquids by shear stress. In 1850, Maxwell left for Cambridge University and initially attended Peterhouse, but eventually left for Trinity College where he believed it was easier to obtain a fellowship. At Trinity, he was elected to the secret society known as the Cambridge Apostles. In November 1851, Maxwell studied under the tutor William Hopkins (nicknamed the "wrangler maker"). A considerable part of the translation of his electromagnetism equations was accomplished during Maxwell's career as an undergraduate in Trinity. In 1854, Maxwell graduated with a degree as second wrangler in mathematics from Trinity (i.e. scoring second-highest in the final mathematics examination) and was declared equal with the senior wrangler of his year in the more exacting ordeal of the Smith's prize examination. For more than half of his relatively short life, he held a prominent position in the foremost rank of scientists, usually as a college professor. Immediately after taking his degree, he read to the Cambridge Philosophical Society a novel memoir, On the Transformation of Surfaces by Bending. This is one of the few purely mathematical papers he published, and it exhibited at once to experts the full genius of its author. About the same time, his elaborate memoir, On Faraday's Lines of Force appeared, in which he gave the first indication of some of the electrical investigations which culminated in the greatest work of his life. From 1855 to 1872, he published at intervals a series of valuable investigations connected with the Perception of Colour and Colour-Blindness, for the earlier of which he received the Rumford medal from the Royal Society in 1860. The instruments which he devised for these investigations were simple and convenient in use. For example, Maxwell's discs were used to compare a variable mixture of three primary colours with a sample colour by observing the spinning "colour top." In 1856, Maxwell was appointed to the chair of Natural Philosophy in Marischal College, Aberdeen, which he held until the fusion of Aberdeen's two colleges in 1860. In 1859, he won the Adams prize in Cambridge for an original essay, On the Stability of Saturn's Rings, in which he concluded the rings could not be completely solid or fluid. Maxwell demonstrated stability could ensue only if the rings consisted of numerous small solid particles, which he called "brickbats". He also mathematically disproved the nebular hypothesis (which stated that the solar system formed through the progressive condensation of a purely gaseous nebula), forcing the theory to account for additional portions of small solid particles. In 1860, he was a professor at King's College London. In 1861, Maxwell was elected to the Royal Society. He researched elastic solids and pure geometry during this time. Kinetic theoryOne of Maxwell's greatest investigations was on the kinetic theory of gases. Originating with Daniel Bernoulli, this theory was advanced by the successive labours of John Herapath, John James Waterston, James Joule, and particularly Rudolf Clausius, to such an extent as to put its general accuracy beyond a doubt; but it received enormous development from Maxwell, who in this field appeared as an experimenter (on the laws of gaseous friction) as well as a mathematician. In 1865, Maxwell moved to the estate he inherited from his father in Glenlair, Kirkcudbrightshire, Scotland. In 1868, he resigned his Chair of Physics and Astronomy at King's College, London. In 1866, he statistically formulated, independently of Ludwig Boltzmann, the Maxwell-Boltzmann kinetic theory of gases. His formula, called the Maxwell distribution, gives the fraction of gas molecules moving at a specified velocity at any given temperature. In the kinetic theory, temperatures and heat involve only molecular movement. This approach generalized the previously established laws of thermodynamics and explained existing observations and experiments in a better way than had been achieved previously. Maxwell's work on thermodynamics led him to devise the thought experiment that came to be known as Maxwell's demon. ElectromagnetismImage:Postcard-from-Maxwell-to-Tait.jpg A postcard from Maxwell to Peter Tait. The greatest work of Maxwell's life was devoted to electricity. Maxwell's most important contribution was the extension and mathematical formulation of earlier work on electricity and magnetism by Michael Faraday, André-Marie Ampère, and others into a linked set of differential equations (originally, 20 equations in 20 variables, later re-expressed in quaternion- and vector-based notations). These equations, which are now collectively known as Maxwell's equations (or occasionally, "Maxwell's Wonderful Equations"), were first presented to the Royal Society in 1864, and together describe the behaviour of both the electric and magnetic fields, as well as their interactions with matter. Maxwell showed that the equations predict the existence of waves of oscillating electric and magnetic fields that travel through empty space at a speed that could be predicted from simple electrical experiments; using the data available at the time, Maxwell obtained a velocity of 310,740,000 m/s. In his 1864 paper A Dynamical Theory of the Electromagnetic Field, Maxwell wrote,
Maxwell was proved correct, and his quantitative connection between light and electromagnetism is considered one of the great triumphs of 19th century physics. At that time, Maxwell believed that the propagation of light required a medium for the waves, dubbed the luminiferous aether. Over time, the existence of such a medium, permeating all space and yet apparently undetectable by mechanical means, proved more and more difficult to reconcile with experiments such as the Michelson-Morley experiment. Moreover, it seemed to require an absolute frame of reference in which the equations were valid, with the distasteful result that the equations changed form for a moving observer. These difficulties inspired Einstein to formulate the theory of special relativity, and in the process Einstein dispensed with the requirement of a luminiferous aether. Control theoryMaxwell published a famous paper "On governors" in the Proceedings of Royal Society, vol. 16 (1867-1868). This paper is quite frequently considered a classical paper in the early days of control theory. (Please see publications below.) Later years, death and afterwardsImage:Tartan Ribbon.jpg The first permanent colour photograph, taken by James Clerk Maxwell in 1861. Maxwell also made contributions to the area of optics and colour vision, being credited with the discovery that colour photographs could be formed using red, green, and blue filters. He had the photographer Thomas Sutton photograph a tartan ribbon three times, each time with a different colour filter over the lens. The three images were developed and then projected onto a screen with three different projectors, each equipped with the same colour filter used to take its image. When brought into focus, the three images formed a full colour image. The three photographic plates now reside in a small museum at 14 India Street, Edinburgh, the house where Maxwell was born. Maxwell's work on colour blindness won him the Rumford Medal by the Royal Society of London. He wrote an admirable textbook of the Theory of Heat (1871), and an excellent elementary treatise on Matter and Motion (1876). Maxwell was also the first to make explicit use of dimensional analysis, also in 1871. Image:JamesClerkMaxwell-KatherineMaxwell-1869.jpg James and Katherine Maxwell, 1869. In 1871, he was the first Cavendish Professor of Physics at Cambridge. Maxwell was put in charge of the development of the Cavendish Laboratory. He supervised every step of the progress of the building and of the purchase of the very valuable collection of apparatus paid for by its generous founder, the 7th Duke of Devonshire (chancellor of the university, and one of its most distinguished alumni). One of Maxwell's last great contributions to science was the editing (with copious original notes) of the electrical researches of Henry Cavendish, from which it appeared that Cavendish researched such questions as the mean density of the earth and the composition of water, among other things. Maxwell married Katherine Mary Dewar when he was 27 years of age, but they had no children. He died in Cambridge of abdominal cancer at the age of 48. He had been a devout Christian his entire life. Maxwell is buried at Parton Kirk, near Castle Douglas in Galloway, Scotland. The extended biography The Life of James Clerk Maxwell, by his former schoolfellow and lifelong friend Professor Lewis Campbell, was published in 1882 and his collected works, including the series of articles on the properties of matter, such as Atom, Attraction, Capillary Action, Diffusion, Ether, etc., were issued in two volumes by the Cambridge University Press in 1890. PersonalityFrom the start of his childhood, religion touched all aspects of Maxwell's life. Both his father and mother were devout churchgoers (Presbyterian and Episcopalian) and instilled a strong faith in their son. All information available suggests that neither in his adolescence, nor in his later years, did Maxwell ever reject the fundamental principles of his Christian faith. Ivan Tolstoy, author of one of Maxwell's biographies, remarked at the frequency with which scientists writing short biographies on Maxwell often omit the subject of his religion. It is impossible, however, to fully understand the man of James Clerk Maxwell without considering his faith. Tolstoy further suggests that such an "introspective, sensitive and lonely adolescent", would have relied on his religious beliefs for comfort. As a great lover of British poetry, Maxwell memorized poems and wrote his own. The best known is Rigid Body Sings closely based on Comin' Through the Rye by Robert Burns, which he apparently used to sing while accompanying himself on a guitar. It has the immortal opening lines[1]:
A collection of his poems was published by his friend Lewis Campbell in 1882. HonoursMaxwell was ranked #24 on Michael H. Hart's list of the most influential figures in history and #91 on the BBC poll of the 100 Greatest Britons. Homage
Publications
See also
References
|
Sites |
Searched sites for "James Clerk Maxwell" |
|
No sites found. |
Sorry, no matching site records were found. |
Want your site listed here?
|
||||||||||||||||||||||||||||||||||||||||
