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Douglas Hartree
Douglas Rayner Hartree (27 March 1897 – 12 February 1958) was an English mathematician and physicist most famous for the development of numerical analysis and its application to the Hartree–Fock equations of atomic physics and the construction of a differential analyser using Meccano. Early life and education Douglas Hartree was born in Cambridge, England. His father, William, was a lecturer in engineering at the University of Cambridge and his mother, Eva Rayner, was president of the National Council of Women of Great Britain and first woman to be mayor of the city of Cambridge. One of his great-grandfathers was Samuel Smiles; another was the marine engineer William Hartree, partner of John Penn. Douglas Hartree was the oldest of three sons that survived infancy. A brother and sister died in infancy when he was still a child, but his two brothers would later also die. Hartree's 7-year-old brother John Edwin died when Hartree was 17, and Hartree's 22-year-old brot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge
Cambridge ( ) is a university city and the county town in Cambridgeshire, England. It is located on the River Cam approximately north of London. As of the 2021 United Kingdom census, the population of Cambridge was 145,700. Cambridge became an important trading centre during the Roman and Viking ages, and there is archaeological evidence of settlement in the area as early as the Bronze Age. The first town charters were granted in the 12th century, although modern city status was not officially conferred until 1951. The city is most famous as the home of the University of Cambridge, which was founded in 1209 and consistently ranks among the best universities in the world. The buildings of the university include King's College Chapel, Cavendish Laboratory, and the Cambridge University Library, one of the largest legal deposit libraries in the world. The city's skyline is dominated by several college buildings, along with the spire of the Our Lady and the English Martyrs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hartree
The hartree (symbol: ''E''h or Ha), also known as the Hartree energy, is the unit of energy in the Hartree atomic units system, named after the British physicist Douglas Hartree. Its CODATA recommended value is = The hartree energy is approximately the electric potential energy of the hydrogen atom in its ground state and, by the virial theorem, approximately twice its ionization energy; the relationships are not exact because of the finite mass of the nucleus of the hydrogen atom and relativistic corrections. The hartree is usually used as a unit of energy in atomic physics and computational chemistry: for experimental measurements at the atomic scale, the electronvolt (eV) or the reciprocal centimetre (cm−1) are much more widely used. Other relationships :E_\mathrm = = m_\mathrm\left(\frac\right)^2 = m_\mathrm c^2 \alpha^2 = ::= 2 Ry = 2 ''R''∞''hc'' ::≜ ::≜ ::≜ ::≜ ::≜ ::≜ ::≜ ::≜ where: *''ħ'' is the reduced Planck consta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballistics
Ballistics is the field of mechanics concerned with the launching, flight behaviour and impact effects of projectiles, especially ranged weapon munitions such as bullets, unguided bombs, rockets or the like; the science or art of designing and accelerating projectiles so as to achieve a desired performance. A ballistic body is a free-moving body with momentum which can be subject to forces such as the forces exerted by pressurized gases from a gun barrel or a propelling nozzle, normal force by rifling, and gravity and air drag during flight. A ballistic missile is a missile that is guided only during the relatively brief initial phase of powered flight and the trajectory is subsequently governed by the laws of classical mechanics; in contrast to (for example) a cruise missile which is aerodynamically guided in powered flight like a fixed-wing aircraft. History and prehistory The earliest known ballistic projectiles were stones and spears, and the throwing stick. The oldes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in genocides within the Ottoman Empire and in the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising France, Russia, and Britain) and the Triple Alliance (containing Germany, Austria-Hungary, and Italy). Tensions in the Balkans came to a head on 28 June 1914, following the assassination of Archduke Franz Ferdin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorothy Helen Rayner
Dorothy Helen Rayner (3 February 1912 – 31 December 2003) was a British geologist who became an authority on the stratigraphy of the British Isles while working at University of Leeds. In 1975 she was awarded the prestigious Lyell Medal from the Geological Society of London for her contributions to the field. Early life and education Rayner was born in Teddington, Middlesex, the second of three children of Agnes (née Styles) and Edwin Rayner, a senior figure at the National Physical Laboratory. The wider family were steeped in science - cousin Douglas Rayner Hartree was a theoretical physicist, her paternal grandfather Edwin Rayner was a medical doctor and her siblings also read science at Cambridge. Her paternal aunt was Eva Hartree, became the first female Mayor of Cambridge. Rayner was educated at Bedales School, then read Natural Sciences at Girton College, Cambridge, graduating with a BA (1st Class) in 1935. She was a University Harkness Scholar and received of the G.G. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Penn (engineer)
John Penn (1805–1878) was an English marine engineer whose firm was pre-eminent in the middle of the 19th century due to his innovations in engine and propeller systems, which led his firm to be the major supplier to the Royal Navy as it made the transition from sail to steam power. He was also president of the Institution of Mechanical Engineers on two occasions. Early life John Penn was born in 1805 in Greenwich, the son of engineer and millwright John Penn (born in Taunton, Somerset, 1770; died 6 June 1843). The senior John Penn had in 1799 started an agricultural engineering business on the site at the junction of Blackheath and Lewisham Roads (close to modern-day Deptford Bridge). It grew in two decades to be one of the major engineering works in the London area. The focus of the firm was mainly in agriculture and more specifically mills for corn and flour. Although John Penn senior lived in Lewisham he stood as a reformist candidate for Greenwich in the December 1832 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biographical Memoirs Of Fellows Of The Royal Society
The ''Biographical Memoirs of Fellows of the Royal Society'' is an academic journal on the history of science published annually by the Royal Society. It publishes obituaries of Fellows of the Royal Society. It was established in 1932 as ''Obituary Notices of Fellows of the Royal Society'' and obtained its current title in 1955, with volume numbering restarting at 1. Prior to 1932, obituaries were published in the ''Proceedings of the Royal Society''. The memoirs are a significant historical record and most include a full bibliography of works by the subjects. The memoirs are often written by a scientist of the next generation, often one of the subject's own former students, or a close colleague. In many cases the author is also a Fellow. Notable biographies published in this journal include Albert Einstein, Alan Turing, Bertrand Russell, Claude Shannon, Clement Attlee, Ernst Mayr, and Erwin Schrödinger. Each year around 40 to 50 memoirs of deceased Fellows of the Royal Soci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Smiles
Samuel Smiles (23 December 1812 – 16 April 1904) was a British author and government reformer. Although he campaigned on a Chartist platform, he promoted the idea that more progress would come from new attitudes than from new laws. His primary work, ''Self-Help'' (1859), promoted thrift and claimed that poverty was caused largely by irresponsible habits, while also attacking materialism and ''laissez-faire'' government. It has been called "the bible of mid- Victorian liberalism" and had lasting effects on British political thought. Early life and education Born in Haddington, East Lothian, Scotland, Smiles was the son of Janet Wilson of Dalkeith and Samuel Smiles of Haddington. He was one of eleven surviving children. While his family members were strict Reformed Presbyterians, he did not practice. He studied at a local school, leaving at the age of 14. He apprenticed to be a doctor under Dr. Robert Lewins. This arrangement enabled Smiles to study medicine at the University ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Council Of Women Of Great Britain
The National Council of Women exists to co-ordinate the voluntary efforts of women across Great Britain. Founded as the National Union of Women Workers, it said that it would "promote sympathy of thought and purpose among the women of Great Britain and Ireland". History It was founded in 1895. It changed its name to the National Council of Women of Great Britain & Ireland in 1918. In 1928 it changed its name to the National Council of Women of Great Britain. Its early archives are held in the London Metropolitan University: Trades Union Congress Library Collections. Pearl Adam wrote the History of the National Council of Women of Great Britain in 1945. Notable members Presidents :1895: Louise Creighton :1897: Mrs Alfred Booth :1899: :1900: Mrs Arthur LytteltonNUWW Annual Reports 1899-1901 TUC Library Collections, London Metropolitan University GB1924 HD6079 :1901: Mrs Arthur Lyttelton :1902: Constance de Rothschild :1903: Mary Clifford :1905: Elizabeth Cadbury :1907: Mrs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eva Hartree
Eva Hartree (née Rayner) (24 December 1873 – 9 September 1947) was the first woman to be Mayor of Cambridge, in 1924–25. Early life Hartree was born Eva Rayner in Stockport in 1873, the daughter of a Jewish doctor, Edwin Rayner and his wife Isabella. Hartree read natural history at Girton College, Cambridge from 1892, completing tripos in 1895, but not graduating as women did not then proceed to graduation. Also in 1895 she married William Hartree, a lecturer in engineering. She was a suffragist (not a more militant suffragette). Civic career Hartree was a Borough Councillor from 1921 to 1927, during which time she was the first woman to be Mayor of Cambridge in 1924–25. As a result of suffering from Graves' disease, she had a short period off the council, but was again a Councillor from 1929 to 1943. Hartree was President of the National Council of Women of Great Britain in 1933. After her husband died in 1943, she resigned from the council and moved to London, to w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meccano
Meccano is a brand of scale model, model construction system created in 1898 by Frank Hornby in Liverpool, England. The system consists of reusable metal strips, plates, Structural steel#Common structural shapes, angle girders, wheels, axles and gears, and plastic parts that are connected using nut (hardware), nuts and bolt (fastener), bolts. It enables the building of working models and mechanical devices. In 1913, a very similar construction set was introduced in the United States under the brand name Erector Set, Erector. In 2000, Meccano bought the Erector brand and unified its presence on all continents. In 2013, the Meccano brand was acquired by the Canadian toy company Spin Master. Meccano maintains a manufacturing facility in Calais, France. History First sets In 1901 Frank Hornby, a clerk from Liverpool, England, invented and patented a new toy called "Mechanics Made Easy" that was based on the principles of mechanical engineering. It was a model construction kit con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Differential Analyser
The differential analyser is a mechanical analogue computer designed to solve differential equations by integration, using wheel-and-disc mechanisms to perform the integration. It was one of the first advanced computing devices to be used operationally. The original machines could not add, but then it was noticed that if the two wheels of a rear differential are turned, the drive shaft will compute the average of the left and right wheels. A simple gear ratio of 1:2 then enables multiplication by two, Multiplication is just a special case of integration, namely integrating a constant function. History Research on solutions for differential equations using mechanical devices, discounting planimeters, started at least as early as 1836, when the French physicist Gaspard-Gustave Coriolis designed a mechanical device to integrate differential equations of the first order. The first description of a device which could integrate differential equations of any order was published in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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