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Petrus Peregrinus
Petrus Peregrinus de Maricourt (Latin), Pierre Pelerin de Maricourt (French), or Peter Peregrinus of Maricourt (fl. 1269), was a French mathematician, physicist, and writer who conducted experiments on magnetism and wrote the first extant treatise describing the properties of magnets. His work is particularly noted for containing the earliest detailed discussion of freely pivoting compass needles, a fundamental component of the dry compass soon to appear in medieval navigation. He also wrote a treatise on the construction and use of a universal astrolabe. Peregrinus' text on the magnet is entitled in many of the manuscripts of it ''Epistola Petri Peregrini de Maricourt ad Sygerum de Foucaucourt, militem, de magnete'' ("Letter of Peter Peregrinus of Maricourt to Sygerus of Foucaucourt, Soldier, on the Magnet") but it is more commonly known by its short title, ''Epistola de magnete'' ("Letter on the Magnet"). The letter is addressed to an otherwise unknown Picard countryman named ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PM Magnete
PM or pm (also written P.M. or p.m.) is an abbreviation for Latin ''post meridiem'', meaning "after midday" in the 12-hour clock. PM or Pm or pm may also refer to: Arts and entertainment *Palm mute, a guitar playing technique * ''PM'' (Australian radio program) * ''PM'' (BBC Radio 4), UK *''PM Magazine'', an American TV news program (1976–1991). * ''PM'' (newspaper), US (1940–1948) * PM Press, an American publishing company *Project Mayhem, a “fictional conspiracy” created in the Chuck Palahniuk 1996 novel Fight Club and 1999 movie of the same name * PM a rock band featuring british drummer Carl Palmer. Business and economics Businesses *P.M. Place Stores, a former US chain of discount stores *Pere Marquette Railway, North America 1900–1947, reporting mark *Philip Morris International, a tobacco company Terminology *Performance management of an organisation * Portfolio manager *Preventive maintenance *Project manager *Product manager Government *Prime minister *Pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achilles Gasser
Achilles Pirmin Gasser (3 November 1505 – 4 December 1577) was a German physician and astrologer. He is now known as a well-connected humanistic scholar, and supporter of both Copernicus and Rheticus. Life Born in Lindau, he studied mathematics, history and philosophy as well as astronomy. He was a student in Sélestat under Johannes Sapidus; he also attended universities in Wittenberg, Vienna, Montpellier, and Avignon.. In 1528, German cartographer Sebastian Münster appealed to scientists across the Holy Roman Empire to assist him with his description of Germany. Gassar accepted this and was later recognized by Münster as a close collaborator for his cartography of the country. Rheticus lost his physician father Georg Iserin in 1528, executed on sorcery charges. Gasser later took over the practice in Feldkirch, Vorarlberg, Feldkirch, in 1538; he taught Rheticus some astrology, and helped his education, in particular by writing to the University of Wittenberg on his behalf. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Augsburg
Augsburg (; bar , Augschburg , links=https://en.wikipedia.org/wiki/Swabian_German , label=Swabian German, , ) is a city in Swabia, Bavaria, Germany, around west of Bavarian capital Munich. It is a university town and regional seat of the ''Regierungsbezirk'' Schwaben with an impressive Altstadt (historical city centre). Augsburg is an urban district and home to the institutions of the Landkreis Augsburg. It is the third-largest city in Bavaria (after Munich and Nuremberg) with a population of 300,000 inhabitants, with 885,000 in its metropolitan area. After Neuss, Trier, Cologne and Xanten, Augsburg is one of Germany's oldest cities, founded in 15 BC by the Romans as Augsburg#Early history, Augusta Vindelicorum, named after the Roman emperor Augustus. It was a Free Imperial City from 1276 to 1803 and the home of the patrician (post-Roman Europe), patrician Fugger and Welser families that dominated European banking in the 16th century. According to Behringer, in the sixteen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire and transitioned into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages. Population decline, counterurbanisation, the collapse of centralized authority, invasions, and mass migrations of tribes, which had begun in late antiquity, continued into the Early Middle Ages. The large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—most recently part of the Eastern Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gloss (annotation)
A gloss is a brief notation, especially a marginal one or an interlinear one, of the meaning of a word or wording in a text. It may be in the language of the text or in the reader's language if that is different. A collection of glosses is a ''glossary.'' A collection of medieval legal glosses, made by glossators, is called an ''apparatus''. The compilation of glosses into glossaries was the beginning of lexicography, and the glossaries so compiled were in fact the first dictionaries. In modern times a glossary, as opposed to a dictionary, is typically found in a text as an appendix of specialized terms that the typical reader may find unfamiliar. Also, satirical explanations of words and events are called glosses. The German Romantic movement used the expression of gloss for poems commenting on a given other piece of poetry, often in the Spanish style. Glosses were originally notes made in the margin or between the lines of a text in a classical language; the meaning of a word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roger Bacon
Roger Bacon (; la, Rogerus or ', also '' Rogerus''; ), also known by the scholastic accolade ''Doctor Mirabilis'', was a medieval English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiricism. In the early modern era, he was regarded as a wizard and particularly famed for the story of his mechanical or necromantic brazen head. He is sometimes credited (mainly since the 19th century) as one of the earliest European advocates of the modern scientific method, along with his teacher Robert Grosseteste. Bacon applied the empirical method of Ibn al-Haytham (Alhazen) to observations in texts attributed to Aristotle. Bacon discovered the importance of empirical testing when the results he obtained were different from those that would have been predicted by Aristotle. His linguistic work has been heralded for its early exposition of a universal grammar, and 21st-century re-evaluations emphasise that Bacon was essentially a medi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PM Astrolabe
PM or pm (also written P.M. or p.m.) is an abbreviation for Latin ''post meridiem'', meaning "after midday" in the 12-hour clock. PM or Pm or pm may also refer to: Arts and entertainment *Palm mute, a guitar playing technique * ''PM'' (Australian radio program) * ''PM'' (BBC Radio 4), UK *''PM Magazine'', an American TV news program (1976–1991). * ''PM'' (newspaper), US (1940–1948) * PM Press, an American publishing company *Project Mayhem, a “fictional conspiracy” created in the Chuck Palahniuk 1996 novel Fight Club and 1999 movie of the same name * PM a rock band featuring british drummer Carl Palmer. Business and economics Businesses *P.M. Place Stores, a former US chain of discount stores *Pere Marquette Railway, North America 1900–1947, reporting mark *Philip Morris International, a tobacco company Terminology *Performance management of an organisation * Portfolio manager *Preventive maintenance *Project manager *Product manager Government *Prime minister *Pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Perpetual Motion Machines
The history of perpetual motion machines dates at least back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but modern theories of thermodynamics have shown that they are impossible. Despite this, many attempts have been made to construct such machines, continuing into modern times. Modern designers and proponents sometimes use other terms, such as "overunity", to describe their inventions. History Pre-19th century There are some unsourced claims that a perpetual motion machine called the "magic wheel" (a wheel spinning on its axle powered by lodestones) appeared in 8th-century Bavaria. This historical claim appears to be unsubstantiated though often repeated. Early designs of perpetual motion machines were done by Indian mathematician– astronomer Bhaskara II, who described a wheel (Bhāskara's wheel) that he claimed would run forever.Lynn Townsend White, Jr. (April 1960). "Tibet, India, and Malaya as Sourc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perpetual Motion
Perpetual motion is the motion of bodies that continues forever in an unperturbed system. A perpetual motion machine is a hypothetical machine that can do work infinitely without an external energy source. This kind of machine is impossible, as it would violate either the first law of thermodynamics, first or second law of thermodynamics or both. These laws of thermodynamics apply regardless of the size of the system. For example, the motions and rotations of celestial bodies such as planets may appear perpetual, but are actually subject to many processes that slowly dissipate their kinetic energy, such as solar wind, interstellar medium resistance, gravitational radiation and thermal radiation, so they will not keep moving forever. Thus, machines that extract energy from finite sources will not operate indefinitely, because they are driven by the energy stored in the source, which will eventually be exhausted. A common example is devices powered by ocean currents, whose energ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnet
A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
