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1807 In Science
The year 1807 in science and technology involved some significant events, listed below. Astronomy * March 29 – H. W. Olbers discovers the asteroid which Carl Friedrich Gauss names Vesta. Chemistry * Potassium and sodium are isolated by Sir Humphry Davy. * The use of fulminate in firearms is patented by Scottish clergyman Alexander John Forsyth. Geology * The Geological Society is founded in London; among the more prominent founders are William Babington, James Parkinson, Humphry Davy and George Bellas Greenough. Mathematics * William Wallace proves that any two simple polygons of equal area are equidecomposable, later known as the Wallace–Bolyai–Gerwien theorem. Medicine * Samuel Hahnemann first introduces the term ' homeopathy' in an essay, "Indications of the Homeopathic Employment of Medicines in Ordinary Practice", published in ''Versammlung der Hufelandische medicinisch-chirurgischen Gesellschaft''. * British Army surgeon John Vetch describes the keratocon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science
Science is a systematic endeavor that Scientific method, builds and organizes knowledge in the form of Testability, testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence for scientific reasoning is tens of thousands of years old. The earliest written records in the history of science come from Ancient Egypt and Mesopotamia in around 3000 to 1200 Common Era, BCE. Their contributions to mathematics, astronomy, and medicine entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the Universe, physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of History of science in classical antiquity, Greek conceptions of the world deteriorated in Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages, but was preserved in the Muslim world during the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Bellas Greenough
George Bellas Greenough FRS FGS (18 January 1778 – 2 April 1855) was a pioneering English geologist. He is best known as a synthesizer of geology rather than as an original researcher. Trained as a lawyer, he was a talented speaker and his annual addresses as founding president of the Geological Society of London were influential in identifying and guiding contemporary geological research. He also courted controversy, after using his presidential address in 1834 to cast aspersions on a paper on great earthquakes by Maria Graham. Greenough advocated an empirical approach to the early science; his scepticism of theoretical thinking courted controversy amongst some contemporaries, especially his doubts of the usefulness of fossils in correlating strata. He compiled a geological map of England and Wales, published in 1820, and in the penultimate year of his life used similar methods to produce the first geological map of British India. Greenough characterised himself as follows: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saône
The Saône ( , ; frp, Sona; lat, Arar) is a river in eastern France. It is a right tributary of the Rhône, rising at Vioménil in the Vosges department and joining the Rhône in Lyon, at the southern end of the Presqu'île. The name derives from that of the Gallic river goddess Souconna, which has also been connected with a local Celtic tribe, the Sequanes. Monastic copyists progressively transformed ''Souconna'' to ''Saoconna'', which ultimately gave rise to . The other recorded ancient names for the river were and . Geography The Saône rises at Vioménil at the foot of the cliff of the Faucilles in the Vosges at an elevation of , and flows into the Rhône at Lyon at an elevation of . Its length is . Its largest tributary is the Doubs; upstream of receiving the Doubs at Verdun-sur-le-Doubs in Saône-et-Loire, the Saône is called the "Petite Saône" (lesser Saône), which reflects the large contribution of the Doubs to the Saône. In fact the Doubs' mean an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internal Combustion Engine
An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high- pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons ( piston engine), turbine blades (gas turbine), a rotor (Wankel engine), or a nozzle ( jet engine). This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to. This replaced the external combustion engine for applications where the weight or size of an engine was more important. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1860, and the first modern internal combustion engi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyréolophore
The Pyréolophore () was probably the world's first internal combustion engine. It was invented in the early 19th century in Chalon-sur-Saône, France, by the Niépce brothers: Nicéphore (who went on to invent photography) and Claude. In 1807 the brothers ran a prototype internal combustion engine, and on 20 July 1807 a patent was granted by Napoleon Bonaparte after it had successfully powered a boat upstream on the river Saône. The Pyréolophore ran on what were believed to be "controlled dust explosions" of various experimental fuels. The fuels included mixtures of Lycopodium powder (the spores of Lycopodium, or clubmoss), finely crushed coal dust, and resin. Operating independently, in 1807 the Swiss engineer François Isaac de Rivaz built the de Rivaz engine, a hydrogen-powered internal combustion engine. These practical engineering projects may have followed the 1680 theoretical design of an internal combustion engine by the Dutch scientist Christiaan Huygens. The se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicéphore Niépce
Joseph Nicéphore Niépce (; 7 March 1765 – 5 July 1833), commonly known or referred to simply as Nicéphore Niépce, was a French inventor, usually credited with the invention of photography. Niépce developed heliography, a technique he used to create the world's oldest surviving product of a photographic process: a print made from a photoengraved printing plate in 1825. In 1826 or 1827, he used a primitive camera to produce the oldest surviving photograph of a real-world scene. Among Niépce's other inventions was the Pyréolophore, one of the world's first internal combustion engines, which he conceived, created, and developed with his older brother Claude Niépce. Biography Early life Niépce was born in Chalon-sur-Saône, Saône-et-Loire, where his father was a wealthy lawyer. His older brother Claude (1763–1828) was also his collaborator in research and invention, but died half-mad and destitute in England, having squandered the family wealth in pursuit of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Claude Niépce
Claude Félix Abel Niépce (1764–1828) was a French inventor and the older brother of the more celebrated Nicéphore Niépce. Claude traveled to England to try to find a sponsor for their internal combustion engine and died there. His brother's later successful development of photography has eclipsed the part played by Claude. Life Claude Félix Abel Niépce was born to Claudine Thérèse Augustine (née De Courteville) and Bernard Niepce, a lawyer, on 28 October 1764, in Chalon-sur-Saône, in Burgundy. His family of landowners had connections to the Royal Court. His younger brother Nicéphore, who during the French Revolution had served in Sardinia and Italy, retired from the army in 1794 to recover from an eye disorder, and settled in Nice. Claude joined him there and they conceived the idea of an internal-combustion engine. In 1801 they returned to oversee the family estate, Le Gras, in the village of Saint-Loup-de-Varennes, near Chalon and there they worked together on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keratoconjunctivitis
Keratoconjunctivitis is inflammation ("-itis") of the cornea and conjunctiva. When only the cornea is inflamed, it is called ''keratitis''; when only the conjunctiva is inflamed, it is called ''conjunctivitis''. Causes There are several potential causes of the inflammation: * Keratoconjunctivitis sicca is used when the inflammation is due to dryness. ("Sicca" means "dryness" in medical contexts.) It occurs with 20% of rheumatoid arthritis patients. * The term " vernal keratoconjunctivitis" (VKC) is used to refer to keratoconjunctivitis occurring in spring, and is usually considered to be due to allergens. * "Atopic keratoconjunctivitis" is one manifestation of atopy. * "Epidemic keratoconjunctivitis" is caused by an adenovirus infection. * " Infectious bovine keratoconjunctivitis" (IBK) is a disease affecting cattle caused by the bacteria '' Moraxella bovis''. * "Pink eye in sheep and goat" is another infectious keratoconjunctivitis of veterinary concern, mostly caused by '' Chl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Vetch
John Vetch MD (1783–1835) was a Scottish army surgeon, now known for his early work on trachoma. The variant spelling Veitch of his surname was also used. Life He was the eldest son of Robert Vetch of Caponflat, born in East Lothian; James Vetch and Hamilton Vetch were younger brothers. He graduated M.D. at the University of Edinburgh in 1804. He joined the army, in the position of hospital mate until he was commissioned in August 1806. A depot hospital had been set up in 1801 at Selsey to treat British troops returning from the fighting in the French campaign in Egypt and Syria, with the condition called "Egyptian ophthalmia". The name was not a very good fit, but its scope in severe cases is recognised as modern medicine's trachoma. Stewart Duke-Elder considered that further pathogens were involved, Weeks Koch bacillus, and some mixture of gonococcus. In 1804 Vetch observed in a battalion of the 52nd Foot at Hythe, Kent, an apparent outbreak of contagious ophthalmia, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Homeopathy
Homeopathy or homoeopathy is a pseudoscientific system of alternative medicine. It was conceived in 1796 by the German physician Samuel Hahnemann. Its practitioners, called homeopaths, believe that a substance that causes symptoms of a disease in healthy people can cure similar symptoms in sick people; this doctrine is called '' similia similibus curentur'', or "like cures like". Homeopathic preparations are termed ''remedies'' and are made using homeopathic dilution. In this process, the selected substance is repeatedly diluted until the final product is chemically indistinguishable from the diluent. Often not even a single molecule of the original substance can be expected to remain in the product. Between each dilution homeopaths may hit and/or shake the product, claiming this makes the diluent remember the original substance after its removal. Practitioners claim that such preparations, upon oral intake, can treat or cure disease. All relevant scientific knowledge a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Hahnemann
Christian Friedrich Samuel Hahnemann (; 10 April 1755 – 2 July 1843) was a German physician, best known for creating the pseudoscientific system of alternative medicine called homeopathy. Early life Christian Friedrich Samuel Hahnemann was born in Meissen, Saxony, near Dresden. His father Christian Gottfried Hahnemann was a painter and designer of porcelain, for which the town of Meissen is famous. As a young man, Hahnemann became proficient in a number of languages, including English, French, Italian, Greek and Latin. He eventually made a living as a translator and teacher of languages, gaining further proficiency in "Arabic, Syriac, Chaldaic and Hebrew". Hahnemann studied medicine for two years at Leipzig. Citing Leipzig's lack of clinical facilities, he moved to Vienna, where he studied for ten months. After one term of further study, he graduated MD at the University of Erlangen on 10 August 1779, qualifying with honors. His poverty may have forced him to choose Erl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallace–Bolyai–Gerwien Theorem
In geometry, the Wallace–Bolyai–Gerwien theorem, named after William Wallace, Farkas Bolyai and Paul Gerwien, is a theorem related to dissections of polygons. It answers the question when one polygon can be formed from another by cutting it into a finite number of pieces and recomposing these by translations and rotations. The Wallace–Bolyai–Gerwien theorem states that this can be done if and only if two polygons have the same area. Wallace had proven the same result already in 1807. According to other sources, Bolyai and Gerwien had independently proved the theorem in 1833 and 1835, respectively. Formulation There are several ways in which this theorem may be formulated. The most common version uses the concept of "equidecomposability" of polygons: two polygons are equidecomposable if they can be split into finitely many triangles that only differ by some isometry (in fact only by a combination of a translation and a rotation). In this case the Wallace–Bolyai†... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
