John Tyndall

John Tyndall (August 2nd 1820 - December 4th 1893) is a scientist Irish.

Biography

Tyndall has been born with Leighlinbridge in the Comté from Carlow in Ireland, his/her father is the son of a land small holder going down from a family of English origin establishes in Ireland for several centuries.

He studies in a school of his county native until the nineteen years age. Left the school he works as draftsman for the Ordnance Survey Ireland starting from 1839 then for that of England of 1842 with 1844. He continues his studies during his spare time and in 1844 becomes Engineer for a company of Railroad. In 1847 it with the possibility of becoming professor of Mathematical in a college lately created, the Queenwood College in the Hampshire. It accepts this station, although it is rénuméré less than its post of engineer, for the orientation of this school towards the applied sciences and to have access to the chemistry laboratory.

In 1848 it leaves in Germany with Edward Frankland to the Université Marbourg, it studies there mainly mathematics but also the Chimie and the Physique in the laboratory of Robert Wilhelm Bunsen. Tyndall obtains its doctorate in 1850. Before turning over in England, it spends one year in the laboratory of Heinrich Gustav Magnus to Berlin.

In 1853 Tyndall receives the royal Médaille then in 1864 the Médaille Rumford. He off becomes scientific adviser of Trinity House in 1865 then Board Trade in 1867. The same year it succeeds Michael Faraday as vice-chancellor of the Royal Institution.

Of 1872 with 1873, it makes a lecture tour to the the United States, it shares its profits, of six and seven miles books of the time, between the Université of Columbia, the Université Harvard and the Université of Pennsylvania.

In 1876 Tyndall Marie with Louisa, girl of Lord Claud Hamilton. It builds a Cottage in the tops of the valley of the the Rhone and a house in 1885 with Hindhead close to Haslemere where it passes most of its last years. Its health declines and he suffers from Sleep disorder, he withdraws Royal Institution. The December 4th 1893, his wife accidentally gives him a Overdose of Hydrate of chloral managed in place of Epsom salt. The doctor whom it calls gives him a Vomitif but he does not have the force to evacuate the potion.

Louisa passes the remainder of its life to promote work of her husband among his pars and the general public, more especially the children. It has much difficulty of writing its biography running up with the biographers whom it chooses, initially Leonard Huxley then Eve and Creasy. For a reason unknown it does not enable them to examine its personal papers. Before its death it withdraws from its newspaper all that has bond with its relations personnel with Tyndall. The personal papers of Elisa and John are now stored at Royal the Institution.

Academic career

Magnetism

It is in Marbourg that Tyndall turns to physics. Under the influence of Hermann Knoblauch, it begins research on the Magnétisme and the Diamagnétisme.

Of return in Great Britain, Tyndall continues its experiments on the Diamagnétisme with the Queenwood College , it does not have more station but uses the laboratory as a guest. It is at that time that it meets Thomas Henry Huxley. Thanks to the support of Edward Sabine he becomes member of the Royal Society in 1852. Tyndall fails has to obtain a station in 1853 with Toronto. It obtains its chance when on invitation it gives a conference in front of the British Association, The Influence off Material Aggregation upon the Manifestations off Force , which establishes its reputation in experimental physics. In June of the same year it obtains a post of professor with the Royal Institution.

Glaciology

Made Tyndall of the important contributions in the field of the flow of the Glacier S. a controversy opposes it to other British scientists relating to the mechanism of this flow, this controversy is exacerbated by the intervention of nonscientists in the debate.

The study of the glaciers leads it to travel several times in Suisse, it becomes a accomplished mountaineer, it is the first to reach the top of the Weisshorn (4 505 m) and fail of little the rise of the Cervin in 1864, its guide advises to make half-turn little before reaching the top.

Tyndall enters in conflict on the problem of the flow of the glaciers mainly with James David Forbes and James Thomson, the disagreement goes on the cause and the way in which this flow is done, several theories are concurrent, slip as for a Solide, flow semi-viscous, continuation of contraction and expansion, fusion and successive Solidification. Forbes considers that the flow is viscous, Tyndall is in favor of a process of Fracture, following a fusion partial of the Glace, and of recongelation. The theory of Tyndall is based on observations of Michael Faraday, the ice melts when it is compressed. Everyone is of agreement on the fact that the glaciers run out as if they were viscous but the cause of this viscosity is badly included/understood. In 1873 Tyndall publishes the glaciers and the transformations of water . It is towards this date that the theory of Tyndall becomes accepted and this during several decades. Nowadays it is known that the glaciers run out by slip and internal deformation. The principal contribution of Tyndall still of topicality rises from its observations of the displacement of the fastest point of the flow in the curves, it shows that the line traced by this succession of points identical to that is observed for the sinuous rivers.

Thermodynamics

Tyndall studies the transparency of gases to the radiant heat of 1859 with 1879, its work on this subject are frequently regarded as most significant of its career. It establishes the calorific capacity for absorption of the Steam. Fascinated by the proposal of Louis Agassiz of the existence in the past of Glacial period it shows that the carbon Dioxide (H ₂ C O ₃) can absorb a great quantity of heat and that if the gases like the Hydrogène, the Oxygène and the Azote are quasi transparent with heat, the steam plays a big role in Climatologie. It concludes that modifications of the proportion of gases in the atmosphere can play a big role in the variations of the climate.

He explains the color blue of the sky with the Effet Tyndall, nowadays called Diffusion Rayleigh, Tyndall is first gave an explanation of this phenomenon while Rayleigh covers the subject much more precisely and provides him a theoretical framework.

Biology

Tyndall tests in the field of sterilization, according to the steps of several other biologists of the time, in particular Louis Pasteur. It confirms the results already obtained, of the environments free of germ S cannot involve Putréfaction and that thus the spontaneous Generation is a dream (1875 - 1876). A practical consequence of its research is a method of Stérilisation, tyndallization used for the sterilization of the culture media when a Autoclave is not available or to destroy certain spores not very sensitive to heat.

In 1875 Tyndall reports to the Royal Society that a species of Penicillium because death of bacterial cultures, it is not the first to make this observation but the potential does not include/understand any.

Scientific popularization

Apart from this research, Tyndall is an influential promoter of sciences, he publishes several books in this field: Faraday ace has Discoverer , Natural Philosophy in Easy Lessons , One the Scientific Use off the Imagination and Fragments off Science . It is influential not only in Great Britain but also with the the United States, particularly after its lecture tour in this country in 1872.

Its scientific articles can be found mainly in the Philosophical Transactions off the Royal Society and in the Proceedings off the Royal Society. Many these articles are taken again and explained in several books, inter alia Heat ace have Mode off Motion published in 1863, One Sound in 1867, Diamagnetism and Magne-crystallic Action in 1870, Contributions to Molecular Physics in the Domain off Radiant Heat in 1872, The Forms off Toilets, &c. in 1872, Readings one Light in 1873, Essays one the Floating-matter off the Air in Relation to Putrefaction and Infection in 1881.

Faith and science

Friend of Thomas Huxley and although less influential than him in the quarrel which opposes the anti-evolutionists to Charles Darwin and his partisans, he preaches to him also a separation of the faith and science. In 1874 its speech in front of the British Association with Belfast, one of the bastions of the religious beliefs in Great Britain, causes many reaction ignited. Tyndall uses this speech to argue on the superiority of the authority of science on the nonrational religion or explanations.

Honors

Several places, organizations or events are named according to Tyndall:

a Crater of impact on Mars, Tyndall, and a mountain, the Mount Tyndall, in the chain of the Sierra Nevada.
the asteroid (22694) Tyndall took this name on June 1st 2007.
Two research centres, the Tyndall Centers, a research center in Climatologie, and the Tyndall National Institute , an research institute based with Cork.
the Royal Institution and BBC produce a series of televised conference éponyme given by scientists during the festivals of Christmas.
royal Medal in 1853
Medal Rumford in 1864

References

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