|
René Just Haüy
René Just Haüy () FRS MWS FRSE (28 February 1743 – 1 June 1822) was a French priest and mineralogist, commonly styled the Abbé Haüy after he was made an honorary canon of Notre Dame. Due to his innovative work on crystal structure and his four-volume ''Traité de Minéralogie'' (1801), he is often referred to as the "Father of Modern Crystallography". During the French revolution he also helped to establish the metric system. Biography Early life René-Just Haüy was born at Saint-Just-en-Chaussée on February 28, 1743, in the province of Île-de-France (later the ''département'' of Oise). His parents were Just Haüy, a poor linen-weaver, and his wife Magdeleine Candelot. Haüy's interest in the services and music of the local church brought him to the attention of the prior of a nearby abbey of Premonstrants. Through him, Haüy was introduced to a colleague in Paris and obtained a scholarship to the College of Navarre. Haüy eventually became an usher, and in 1764 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint-Just-en-Chaussée
Saint-Just-en-Chaussée ( pcd, Saint-Just-in-Cœuchie) is a commune in the Oise department in northern France. Saint-Just-en-Chaussée station has rail connections to Amiens, Creil and Paris. History Its name refers to Saint Justus of Beauvais, who is said to have been martyred at this spot. Population Personalities Valentin Haüy and René Just Haüy (brothers) were born in Saint-Just-en-Chaussée. See also * Communes of the Oise department The following is a list of the 679 communes of the Oise department of France. The communes cooperate in the following intercommunalities (as of 2020):Communes of Oise {{Oise-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deacon
A deacon is a member of the diaconate, an office in Christian churches that is generally associated with service of some kind, but which varies among theological and denominational traditions. Major Christian churches, such as the Catholic Church, the Oriental Orthodox Churches, the Eastern Orthodox Church, the Scandinavian Lutheran Churches, the Methodist Churches, the Anglican Communion, and the Free Church of England, view the diaconate as an order of ministry. Origin and development The word ''deacon'' is derived from the Greek word (), which is a standard ancient Greek word meaning "servant", "waiting-man", "minister", or "messenger". It is generally assumed that the office of deacon originated in the selection of seven men by the apostles, among them Stephen, to assist with the charitable work of the early church as recorded in Acts of the Apostles chapter 6. The title ''deaconess'' ( grc, διακόνισσα, diakónissa, label=none) is not found in the Bib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barium
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. The most common minerals of barium are baryte ( barium sulfate, BaSO4) and witherite ( barium carbonate, BaCO3). The name ''barium'' originates from the alchemical derivative "baryta", from Greek (), meaning 'heavy'. ''Baric'' is the adjectival form of barium. Barium was identified as a new element in 1774, but not reduced to a metal until 1808 with the advent of electrolysis. Barium has few industrial applications. Historically, it was used as a getter for vacuum tubes and in oxide form as the emissive coating on indirectly heated cathodes. It is a component of YBCO ( high-temperature superconductors) and electroceramics, and is added to steel and cast iron to reduce the size of carbon grains within the microstructure. Barium compoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystallography Haüy Integrant Molecules Form Pentagonal Dodecahedron Of Pyrite 1801
Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials science and solid-state physics ( condensed matter physics). The word "crystallography" is derived from the Greek word κρύσταλλος (''krystallos'') "clear ice, rock-crystal", with its meaning extending to all solids with some degree of transparency, and γράφειν (''graphein'') "to write". In July 2012, the United Nations recognised the importance of the science of crystallography by proclaiming that 2014 would be the International Year of Crystallography. denote a direction vector (in real space). * Coordinates in ''angle brackets'' or ''chevrons'' such as <100> denote a ''family'' of directions which are related by symmetry operations. In the cubic crystal system for example, would mean 00 10 01/nowiki> or the negative of any of those directions. * Miller indices in ''parenthese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhomboid
Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled. A parallelogram with sides of equal length (equilateral) is a rhombus but not a rhomboid. A parallelogram with right angled corners is a rectangle but not a rhomboid. The term ''rhomboid'' is now more often used for a rhombohedron or a more general parallelepiped, a solid figure with six faces in which each face is a parallelogram and pairs of opposite faces lie in parallel planes. Some crystals are formed in three-dimensional rhomboids. This solid is also sometimes called a rhombic prism. The term occurs frequently in science terminology referring to both its two- and three-dimensional meaning. History Euclid introduced the term in his '' Elements'' in Book I, Definition 22, Euclid never used the definition of rhomboid again and introduced the word parallelogram in Proposition 34 of Book I; ''"In parallelogrammic ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcareous Spar
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, and vaterite is even less stable. Etymology Calcite is derived from the German ''Calcit'', a term from the 19th century that came from the Latin word for lime, ''calx'' (genitive calcis) with the suffix "-ite" used to name minerals. It is thus etymologically related to chalk. When applied by archaeologists and stone trade professionals, the term alabaster is used not just as in geology and mineralogy, where it is reserve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystallography
Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials science and solid-state physics ( condensed matter physics). The word "crystallography" is derived from the Greek word κρύσταλλος (''krystallos'') "clear ice, rock-crystal", with its meaning extending to all solids with some degree of transparency, and γράφειν (''graphein'') "to write". In July 2012, the United Nations recognised the importance of the science of crystallography by proclaiming that 2014 would be the International Year of Crystallography. denote a direction vector (in real space). * Coordinates in ''angle brackets'' or ''chevrons'' such as <100> denote a ''family'' of directions which are related by symmetry operations. In the cubic crystal system for example, would mean 00 10 01/nowiki> or the negative of any of those directions. * Miller indices in ''parentheses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Institut National Des Jeunes Aveugles
Institut National des Jeunes Aveugles (''National Institute for Blind Children'' or ''Royal Institution for Blind Youth''), in Paris, was the first special school for blind students in the world, and served as a model for many subsequent schools for blind students. History It was not until the late 18th century that society began to take an interest in the education of the blind. Until that time they were considered mostly uneducable and untrainable. In 1784, Valentin Haüy undertook to teach François Lesueur to read, with the help of the '' Société philanthropique''. It enabled him to prove the efficiency of his method. In 1785, he founded, on his own funds, what was then called the Institute for Blind Youth (''Institution des jeunes aveugles''), in Coquillère street. In 1786, this school move to a building in Notre-Dame-des-Victoires street, rented by the ''Société philantropique'', a group of benefactors. On December 26, Haüy presents his methods and some of his pupils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valentin Haüy
Valentin Haüy (pronounced ; 13 November 1745 – 19 March 1822) was the founder, in 1785, of the first school for the blind, the Institute for Blind Youth in Paris (now Institut National des Jeunes Aveugles, or the ''National Institute for the Young Blind'', INJA). In 1819, Louis Braille entered this school. Life Haüy was born into a family of weavers. His father, a full-time loomer, also held the job of ringing the Angelus bells in a local Premonstrant Abbey. The abbey monks educated Valentin and he became a skilled linguist speaking ten different languages of the day. He also studied ancient Greek and Hebrew. In 1783, he gained the title "interpreter to the king", Louis XVI. In 1786, he was the interpreter of the King, to the Admiralty and the City Hall. He was a member of the Office of Writing. Haüy's impulse to help the blind started in 1771, after he stopped for lunch in a cafe on the Place de la Concorde, Paris. There, he witnessed an ensemble of people from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineralogy
Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the processes of mineral origin and formation, classification of minerals, their geographical distribution, as well as their utilization. History Early writing on mineralogy, especially on gemstones, comes from ancient Babylonia, the ancient Greco-Roman world, ancient and medieval China, and Sanskrit texts from ancient India and the ancient Islamic world. Books on the subject included the '' Naturalis Historia'' of Pliny the Elder, which not only described many different minerals but also explained many of their properties, and Kitab al Jawahir (Book of Precious Stones) by Persian scientist Al-Biruni. The German Renaissance specialist Georgius Agricola wrote works such as '' De re metallica'' (''On Metals'', 1556) and '' De Natura Fossilium' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis-Jean-Marie Daubenton
Louis Jean-Marie Daubenton (29 May 1716 – 1 January 1800) was a French naturalist and contributor to the ''Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers''. Biography Daubenton was born at Montbard, Côte-d'Or. His father, Jean Daubenton, a notary, intended him for the church, and sent him to Paris to study theology, but Louis-Jean-Marie was more interested in medicine. Jean's death in 1736 set his son free to choose his own career, and in 1741 he graduated in medicine at Reims and returned to his hometown, planning to practice as a physician. At about this time, Georges-Louis Leclerc de Buffon, also a native of Montbard, was preparing to bring out a multi-volume work on natural history, the ''Histoire naturelle, générale et particulière'', and in 1742 he invited Daubenton to assist him by providing anatomical descriptions. In many respects, the two men were complete opposites, but they worked well in partnership. In 1744, Daubenton bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> René Just Haüy")
