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Samuel Hunter Christie
Samuel Hunter Christie FRS (22 March 1784 – 24 January 1865) was a British physicist and mathematician. Life He studied mathematics at Trinity College, Cambridge, where he won the Smith's Prize and was second wrangler. He was particularly interested in magnetism, studying the Earth's magnetic field and designing improvements to the magnetic compass. Some of his magnetic research was done in collaboration with Peter Barlow. He became a Fellow of the Royal Society in 1826, delivered their Bakerian Lecture in 1833 and served as their Secretary from 1837 to 1853. In 1833 he published his 'diamond' method, the forerunner of the Wheatstone bridge, in a paper on the magnetic and electrical properties of metals, as a method for comparing the resistances of wires of different thicknesses. However, the method went unrecognised until 1843, when Charles Wheatstone proposed it, in another paper for the Royal Society, for measuring resistance in electrical circuits. Although Wheatst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London
London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a major settlement for two millennia. The City of London, its ancient core and financial centre, was founded by the Roman Empire, Romans as ''Londinium'' and retains its medieval boundaries.See also: Independent city#National capitals, Independent city § National capitals The City of Westminster, to the west of the City of London, has for centuries hosted the national Government of the United Kingdom, government and Parliament of the United Kingdom, parliament. Since the 19th century, the name "London" has also referred to the metropolis around this core, historically split between the Counties of England, counties of Middlesex, Essex, Surrey, Kent, and Hertfordshire, which largely comprises Greater London ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peter Barlow (mathematician)
Peter Barlow (13 October 1776 – 1 March 1862)Lance Day and Ian McNeil, ''Biographical dictionary of the history of technology'', Routledge, 1995, page 42. was an English mathematician and physicist. Work in mathematics In 1801, Barlow was appointed assistant mathematics master at the Royal Military Academy, Woolwich, and retained this post until 1847. He contributed articles on mathematics to ''The Ladies' Diary'' as well as publishing books such as: ''An Elementary Investigation of the Theory of Numbers''(1811); ''A New Mathematical and Philosophical Dictionary''(1814); and ''New Mathematical Tables''(1814). The latter became known as ''Barlow's Tables'' and gives squares, cubes, square roots, cube roots, and reciprocals of all integer numbers from 1 to 10,000. These tables were regularly reprinted until 1965, when computers rendered them obsolete. He contributed to ''Rees's Cyclopædia'' articles on Algebra, Analysis, Geometry and Strength of Materials. Barlow also contribu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second Wranglers
The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units ( SI) is more precise:The second ..is defined by taking the fixed numerical value of the caesium frequency, Δ''ν''Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be when expressed in the unit Hz, which is equal to s−1. This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ever so slightly, a leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation. Uses Analog clocks and watches often have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People Associated With Electricity
A person ( : people) is a being that has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal responsibility. The defining features of personhood and, consequently, what makes a person count as a person, differ widely among cultures and contexts. In addition to the question of personhood, of what makes a being count as a person to begin with, there are further questions about personal identity and self: both about what makes any particular person that particular person instead of another, and about what makes a person at one time the same person as they were or will be at another time despite any intervening changes. The plural form "people" is often used to refer to an entire nation or ethnic group (as in "a people"), and this was the original meaning of the word; it subsequently acquired its use as a plural form of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fellows Of The Royal Society
Fellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted by the judges of the Royal Society of London to individuals who have made a "substantial contribution to the improvement of natural knowledge, including mathematics, engineering science, and medical science". Fellowship of the Society, the oldest known scientific academy in continuous existence, is a significant honour. It has been awarded to many eminent scientists throughout history, including Isaac Newton (1672), Michael Faraday (1824), Charles Darwin (1839), Ernest Rutherford (1903), Srinivasa Ramanujan (1918), Albert Einstein (1921), Paul Dirac (1930), Winston Churchill (1941), Subrahmanyan Chandrasekhar (1944), Dorothy Hodgkin (1947), Alan Turing (1951), Lise Meitner (1955) and Francis Crick (1959). More recently, fellowship has been awarded to Stephen Hawking (1974), David Attenborough (1983), Tim Hunt (1991), Elizabeth Blackburn (1992), Tim Berners-Lee (2001), Venki Ramakris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Physicists
British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, the English language as spoken and written in the United Kingdom or, more broadly, throughout the British Isles * Celtic Britons, an ancient ethno-linguistic group * Brittonic languages, a branch of the Insular Celtic language family (formerly called British) ** Common Brittonic, an ancient language Other uses *'' Brit(ish)'', a 2018 memoir by Afua Hirsch *People or things associated with: ** Great Britain, an island ** United Kingdom, a sovereign state ** Kingdom of Great Britain (1707–1800) ** United Kingdom of Great Britain and Ireland (1801–1922) See also * Terminology of the British Isles * Alternative names for the British * English (other) * Britannic (other) * British Isles * Brit (other) * Br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1865 Deaths
Events January–March * January 4 – The New York Stock Exchange opens its first permanent headquarters at 10-12 Broad near Wall Street, in New York City. * January 13 – American Civil War : Second Battle of Fort Fisher: United States forces launch a major amphibious assault against the last seaport held by the Confederates, Fort Fisher, North Carolina. * January 15 – American Civil War: United States forces capture Fort Fisher. * January 31 ** The Thirteenth Amendment to the United States Constitution (conditional prohibition of slavery and involuntary servitude) passes narrowly, in the House of Representatives. ** American Civil War: Confederate General Robert E. Lee becomes general-in-chief. * February ** American Civil War: Columbia, South Carolina burns, as Confederate forces flee from advancing Union forces. * February 3 – American Civil War : Hampton Roads Conference: Union and Confederate leaders discuss peace terms. * Febru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1784 Births
Events January–March * January 6 – Treaty of Constantinople: The Ottoman Empire agrees to Russia's annexation of the Crimea. * January 14 – The Congress of the United States ratifies the Treaty of Paris with Great Britain to end the American Revolution, with the signature of President of Congress Thomas Mifflin.''Harper's Encyclopaedia of United States History from 458 A. D. to 1909'', ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p167 * January 15 – Henry Cavendish's paper to the Royal Society of London, ''Experiments on Air'', reveals the composition of water. * February 24 – The Captivity of Mangalorean Catholics at Seringapatam begins. * February 28 – John Wesley ordains ministers for the Methodist Church in the United States. * March 1 – The Confederation Congress accepts Virginia's cession of all rights to the Northwest Territory and to Kentucky. * March 22 – The Emerald Buddha is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Henry Mahoney Christie
Sir William Henry Mahoney Christie (1 October 1845 – 22 January 1922) was a British astronomer. He was born in Woolwich, London, the son of Samuel Hunter Christie and educated at King's College School and Trinity College, Cambridge. He was fourth wrangler in 1868 and was elected a fellow of Trinity in 1869. Having been Chief Assistant at the Royal Observatory at Greenwich from 1870 to 1881, he was appointed to replace George Airy as the eighth Astronomer Royal in 1881 and remained in office until 1910. He received the degree D.Sc. ''(honoris causa)'' from the University of Oxford in June 1902, and was created a Knight Commander of the Order of the Bath (KCB) in 1904. He was elected a Fellow of the Royal Society in June, 1881. He was president of the Royal Astronomical Society from 1888 to 1890. The first Astronomer Royal to retire at 65 (all previous incumbents bar Airy and John Pond John Pond FRS (1767 – 7 September 1836) was a renowned English astronomer wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Portrait Gallery (London)
The National Portrait Gallery (NPG) is an art gallery in London housing a collection of portraits of historically important and famous British people. It was arguably the first national public gallery dedicated to portraits in the world when it opened in 1856. The gallery moved in 1896 to its current site at St Martin's Place, off Trafalgar Square, and adjoining the National Gallery. It has been expanded twice since then. The National Portrait Gallery also has regional outposts at Beningbrough Hall in Yorkshire and Montacute House in Somerset. It is unconnected to the Scottish National Portrait Gallery in Edinburgh, with which its remit overlaps. The gallery is a non-departmental public body sponsored by the Department for Digital, Culture, Media and Sport. Collection The gallery houses portraits of historically important and famous British people, selected on the basis of the significance of the sitter, not that of the artist. The collection includes photographs and caricatu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Military Academy, Woolwich
The Royal Military Academy (RMA) at Woolwich, in south-east London, was a British Army military academy for the training of commissioned officers of the Royal Artillery and Royal Engineers. It later also trained officers of the Royal Corps of Signals and other technical corps. RMA Woolwich was commonly known as "The Shop" because its first building was a converted workshop of the Woolwich Arsenal. History Origins in the Royal Arsenal An attempt had been made by the Board of Ordnance in 1720 to set up an academy within its Arsenal (then known as the Warren) to provide training and education for prospective officers of its new Regiment of Artillery and Corps of Engineers (both of which had been established there in 1716). A new building was being constructed in readiness for the Academy and funds had been secured, seemingly, through investment in the South Sea Company; but the latter's collapse led to plans for the Academy being placed on hold. After this false start, the aca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Wheatstone
Sir Charles Wheatstone FRS FRSE DCL LLD (6 February 1802 – 19 October 1875), was an English scientist and inventor of many scientific breakthroughs of the Victorian era, including the English concertina, the stereoscope (a device for displaying three-dimensional images), and the Playfair cipher (an encryption technique). However, Wheatstone is best known for his contributions in the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used to measure an unknown electrical resistance, and as a major figure in the development of telegraphy. Life Charles Wheatstone was born in Barnwood, Gloucestershire. His father, W. Wheatstone, was a music-seller in the town, who moved to 128 Pall Mall, London, four years later, becoming a teacher of the flute. Charles, the second son, went to a village school, near Gloucester, and afterwards to several institutions in London. One of them was in Kennington, and kept by a Mrs. Castlemaine, who ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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