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Johann Heinrich Pott
Johann Heinrich Pott (6 October 1692 – 29 March 1777) was a Prussian physician and chemist. He is considered a pioneer of pyrochemistry. He examined the elements bismuth and manganese apart from attempting improvements to glass and porcelain production. Biography Pott was born in Halberstadt, son of the royal councillor Johann Andreas Pott (1662–1729) and Dorothea Sophia daughter of Andreas Machenau. He studied at the cathedral school in Halberstadt and Francke's pedagogium before studying theology at the University of Halle. He then shifted to study medicine and chemistry under Georg Ernst Stahl. In 1713 he studied assaying at Mansfield under mining master Lages. He spent two years along with two of his brothers as travelling evangelists for the Community of True Inspiration but he left the sect in 1715 and returned to study chemistry at Halle, receiving a doctorate in 1716 on sulfur under Friedrich Hoffmann. He worked as a physician in Halberstadt before moving to Berlin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phlogiston Theory
The phlogiston theory is a superseded scientific theory that postulated the existence of a fire-like element called phlogiston () contained within combustible bodies and released during combustion. The name comes from the Ancient Greek (''burning up''), from (''flame''). The idea was first proposed in 1667 by Johann Joachim Becher and later put together more formally by Georg Ernst Stahl. Phlogiston theory attempted to explain chemical processes such as combustion and rusting, now collectively known as oxidation. It was challenged by the concomitant weight increase, and was abandoned before the end of the 18th century following experiments by Antoine Lavoisier and others. Phlogiston theory led to experiments which ultimately concluded with the discovery of oxygen. Theory Phlogiston theory states that ''phlogisticated'' substances contain phlogiston and that they ''dephlogisticate'' when burned, releasing stored phlogiston which is absorbed by the air. Growing plants then ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1692 Births
Year 169 ( CLXIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Senecio and Apollinaris (or, less frequently, year 922 ''Ab urbe condita''). The denomination 169 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Marcomannic Wars: Germanic tribes invade the frontiers of the Roman Empire, specifically the provinces of Raetia and Moesia. * Northern African Moors invade what is now Spain. * Marcus Aurelius becomes sole Roman Emperor upon the death of Lucius Verus. * Marcus Aurelius forces his daughter Lucilla into marriage with Claudius Pompeianus. * Galen moves back to Rome for good. China * Confucian scholars who had denounced the court eunuchs are arrested, killed or banished from the capital of Luoyang and official life du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
B30535633
B3, B03, B.III or B-3 may refer to: Military American bombers * Keystone B-3, a biplane bomber of the United States Army Air Corps * Next-Generation Bomber (2018 Bomber), next bomber follow-on to the B-2 stealth bomber program * Long Range Strike Bomber program, successor program to the 2018 Bomber program ** Northrop Grumman B-21, a successor aircraft to the B-1 and B-52 bombers German and Austro-Hungarian aircraft * AEG B.III, a German reconnaissance aircraft * Albatros B.III, a German Idflieg B-class designation aircraft * Aviatik B.III, a 1916 Austro-Hungarian reconnaissance aircraft * Euler B.III, a German Idflieg B-class designation aircraft * Fokker B.III (other), two aircraft models * Halberstadt B.III, a German Idflieg B-class designation aircraft * Kampfgeschwader 54, from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II * Lohner B.III * LVG B.III, a 1910s German two-seat trainer biplane Submarines * USS ''B-3'' (SS-12), a Unit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrolusite
Pyrolusite is a mineral consisting essentially of manganese dioxide ( Mn O2) and is important as an ore of manganese.. It is a black, amorphous appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform crusts. It has a metallic luster, a black or bluish-black streak, and readily soils the fingers. The specific gravity is about 4.8. Its name is from the Greek for ''fire'' and to ''wash'', in reference to its use as a way to remove tints from glass. Occurrence Pyrolusite and romanechite are among the most common manganese minerals. Pyrolusite occurs associated with manganite, hollandite, hausmannite, braunite, chalcophanite, goethite, and hematite under oxidizing conditions in hydrothermal deposits. It also occurs in bogs and often results from alteration of manganite. Use The metal is obtained by reduction of the oxide with sodium, magnesium, aluminium, or by electrolysis. Pyrolusite is extensively used for the manufacture of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frederick The Great
Frederick II (german: Friedrich II.; 24 January 171217 August 1786) was King in Prussia from 1740 until 1772, and King of Prussia from 1772 until his death in 1786. His most significant accomplishments include his military successes in the Silesian wars, his re-organisation of the Prussian Army, the First Partition of Poland, and his patronage of the arts and the Enlightenment. Frederick was the last Hohenzollern monarch titled King in Prussia, declaring himself King of Prussia after annexing Polish Prussia from the Polish–Lithuanian Commonwealth in 1772. Prussia greatly increased its territories and became a major military power in Europe under his rule. He became known as Frederick the Great (german: links=no, Friedrich der Große) and was nicknamed "Old Fritz" (german: links=no, "Der Alte Fritz"). In his youth, Frederick was more interested in music and philosophy than in the art of war, which led to clashes with his authoritarian father, Frederick William I of Prus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graphite
Graphite () is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions. Synthetic and natural graphite are consumed on large scale (300 kton/year, in 1989) for uses in pencils, lubricants, and electrodes. Under high pressures and temperatures it converts to diamond. It is a weak conductor of heat and electricity. Types and varieties Natural graphite The principal types of natural graphite, each occurring in different types of ore deposits, are * Crystalline small flakes of graphite (or flake graphite) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken. When broken the edges can be irregular or angular; * Amorphous graphite: very fine flake graphite is sometimes called amorphous; * Lump graphite (or vein graphite) occurs in fissure veins or fractures and appears as massive platy intergrowths of fibrous or acicular cry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Theodor Eller
Johann Theodor Eller (von Brockhausen) (29 November 1689 – 13 September 1760) was a German physician, mineralogist and chemist who served in the Prussian court. Eller followed the beliefs of the day that heat was an element. Lavoisier read his works on air and fire. In his medical research he claimed that copper in cooking utensils was harmful. Eller was born in Plötzkau, son of Jobst Hermann Eller, a military officer who had served under the Prince of Anhalt before becoming a justice of peace and an innkeeper. His mother was from a noble family of Livonia. Tutored initially at home, he was then educated in law at the Quedlinburg gymnasium he went on to study at Jena University in 1709 where he shifted to medicine under G. W. Wedel and H. F. Teichmeyer. He then went to study anatomy in Halle, Leiden (1711) and Amsterdam, studying under the anatomists Frederik Ruysch and Johannes Jacobus Rau. He received his MD from Leiden in 1716. He followed Rau to Leiden and served as a dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernst Gottfried Kurella
Ernst is both a surname and a given name, the German, Dutch, and Scandinavian form of Ernest. Notable people with the name include: Surname * Adolf Ernst (1832–1899) German botanist known by the author abbreviation "Ernst" * Anton Ernst (1975-) South African Film Producer * Alice Henson Ernst (1880-1980), American writer and historian * Britta Ernst (born 1961), German politician * Cornelia Ernst, German politician * Edzard Ernst, German-British Professor of Complementary Medicine * Emil Ernst, astronomer * Ernie Ernst (1924/25–2013), former District Judge in Walker County, Texas * Eugen Ernst (1864–1954), German politician * Fabian Ernst, German soccer player * Gustav Ernst, Austrian writer * Heinrich Wilhelm Ernst, Moravian violinist and composer * Jim Ernst, Canadian politician * Jimmy Ernst, American painter, son of Max Ernst * Joni Ernst, U.S. Senator from Iowa * K.S. Ernst, American visual poet * Karl Friedrich Paul Ernst, German writer (1866–1933) * Ken Ernst, U.S. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspar Neumann (chemist)
Caspar Neumann (or Neuman) (July 11, 1683 – October 20, 1737) was a German chemist and apothecary. Biography Birth and Education Neumann was born at Zullichau,Alexander Chalmers: ''General Biographical Dictionary.'' London, 1812, Vol. 23, p. 103. in the Electorate of Brandenburg, July 11, 1683. He was first educated in music by his father, but being orphaned at age 12, he apprenticed to his godfather, the apothecary, Johannes Romke. Completing his apprenticeship in 1701, he commenced practice at Unruhstadt, or Kargowa, in Poland.Alexander Kraft: ''On Two Letters from Caspar Neumann to John Woodward Revealing the Secret Method for Preparation of Prussian Blue.'' p.137. Career After three years in Kargowa, he went to Berlin in 1704, working at first at the apothecary shop of Christoph Schmedicke. Soon thereafter he became a traveling apothecary for the king of Prussia, Frederick I,Noretta Koertge:''Complete Dictionary of Scientific Biography'' and he continued in this capaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collegium Medico Chirurgicum
A (plural ), or college, was any association in ancient Rome that acted as a legal entity. Following the passage of the ''Lex Julia'' during the reign of Julius Caesar as Consul and Dictator of the Roman Republic (49–44 BC), and their reaffirmation during the reign of Caesar Augustus as ''Princeps senatus'' and Imperator of the Roman Army (27 BC–14 AD), ''collegia'' required the approval of the Roman Senate or the Emperor in order to be authorized as legal bodies. Such associations could be civil or religious. The word literally means "society", from (‘colleague’). They functioned as social clubs or religious collectives whose members worked towards their shared interests. These shared interests encompassed a wide range of the various aspects of urban life; including political interests, cult practices, professions, trade, and civic services. The social connections fostered by ''collegia'' contributed to their influence on politics and the economy; acting as lobby ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
