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Johann Andreas Cramer
Johann Andreas Cramer (14 December 1710 – 6 December 1777) was a German metallurgist and chemist who published some of the early ideas on metallurgy and chemistry in his books which included ''Elementa Artis Docimasticae'' (1741). Cramer was born in Quedlinburg where his father was a businessman involved in the iron ore industry. As a child he travelled to mines in the Harz region along with his father and after the death of his father he was taken care of by his brother-in-law Christian George Schwalbe (1691-1791). Schwalbe was a physician with a circle of acquaintances who included chemists and botanists including Linnaeus. Cramer studied law for a semester at Hamburg before moving to Halle to study medicine in 1726. His teachers included George Ernst Stahl (1659-1734). He did not complete his medical studies and took an interest mainly in the chemistry subjects and them moved back to study law while attending chemistry courses at Halle by Juncker and Peter Gericke (1693–175 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallurgy
Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their mixtures, which are known as alloys. Metallurgy encompasses both the science and the technology of metals; that is, the way in which science is applied to the production of metals, and the engineering of metal components used in products for both consumers and manufacturers. Metallurgy is distinct from the craft of metalworking. Metalworking relies on metallurgy in a similar manner to how medicine relies on medical science for technical advancement. A specialist practitioner of metallurgy is known as a metallurgist. The science of metallurgy is further subdivided into two broad categories: chemical metallurgy and physical metallurgy. Chemical metallurgy is chiefly concerned with the reduction and oxidation of metals, and the chemical performance of metals. Subjects of study in chemical metallurgy include mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quedlinburg
Quedlinburg () is a town situated just north of the Harz mountains, in the district of Harz in the west of Saxony-Anhalt, Germany. As an influential and prosperous trading centre during the early Middle Ages, Quedlinburg became a center of influence under the Ottonian dynasty in the 10th and 11th centuries. The castle, church and old town, dating from this time of influence, were added to the UNESCO World Heritage List in 1994 because of their exceptional preservation and outstanding Romanesque architecture. Quedlinburg has a population of more than 24,000. The town was the capital of the district of Quedlinburg until 2007, when the district was dissolved. Several locations in the town are designated stops along a scenic holiday route, the Romanesque Road. History The town of Quedlinburg is known to have existed since at least the early 9th century, when there was a settlement known as ''Gross Orden'' on the eastern bank of the River Bode. It was first mentioned as a to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harz
The Harz () is a highland area in northern Germany. It has the highest elevations for that region, and its rugged terrain extends across parts of Lower Saxony, Saxony-Anhalt, and Thuringia. The name ''Harz'' derives from the Middle High German word ''Hardt'' or ''Hart'' (hill forest). The name ''Hercynia'' derives from a Celtic name and could refer to other mountain forests, but has also been applied to the geology of the Harz. The Brocken is the highest summit in the Harz with an elevation of above sea level. The Wurmberg () is the highest peak located entirely within the state of Lower Saxony. Geography Location and extent The Harz has a length of , stretching from the town of Seesen in the northwest to Eisleben in the east, and a width of . It occupies an area of , and is divided into the Upper Harz (''Oberharz'') in the northwest, which is up to 800 m high, apart from the 1,100 m high Brocken massif, and the Lower Harz (''Unterharz'') in the east which is up to aroun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Ernst Stahl
Georg Ernst Stahl (22 October 1659 – 24 May 1734) was a German chemist, physician and philosopher. He was a supporter of vitalism, and until the late 18th century his works on phlogiston were accepted as an explanation for chemical processes.Ku-ming Chang (2008)"Stahl, Georg Ernst", ''Complete Dictionary of Scientific Biography'', Vol. 24, from Cengage Learning __TOC__ Biography Georg Ernst Stahl was born on October 22, 1659, at Anspach in Bavaria. Raised as a son to a Lutheran Pastor, he was brought up in a very pious and religious household. From an early age he expressed profound interest toward chemistry, even by age 15 mastering a set of university lecture notes on chemistry and eventually a difficult treatise by Johann Kunckel. He had two wives, who both died from puerperal fever in 1696 and 1706. He also had a son Johnathan and a daughter who died in 1708. He continued to work and publish following the death of both of his wives and eventually his children, but was o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Juncker
Johann Juncker (23 December 1679 in Londorf, Hesse – 25 October 1759 in Halle) was a German physician and chemist. Juncker was a leader in the Pietist reform movement as it applied to medicine. He directed the Francke Foundations and initiated approaches to medical practice, charitable treatment, and education at the University of Halle that influenced others internationally. He was a staunch proponent of Georg Ernst Stahl and helped to more clearly present Stahl's phlogiston theory of combustion. Early life and education Johann Juncker was born on 23 December 1679 to Johann Ludwig Juncker, a well-to-do tenant farmer in Londorf, near Giessen. Juncker went to school in Allendorf and Obernhof, before attending the Pädagogium in Giessen for four years. The head of the institution at that time, J. H. May, was a Pietist. A dissident evangelical reform movement, Pietism emphasized the practical application of theology and active charitable work. Juncker attended the University ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blankenburg (Harz)
Blankenburg (Harz) is a town and health resort in the district of Harz, in Saxony-Anhalt, Germany, at the north foot of the Harz Mountains, southwest of Halberstadt. It has been in large part rebuilt since a fire in 1836, and possesses a castle, with various collections, a museum of antiquities, an old town hall and churches. There are pine-needle baths and a psychiatric hospital. Gardening is a speciality. The nearby ridge of rocks called the ''Teufelsmauer'' (Devils Wall) offers views across the plain and into the deep gorges of the Harz. Geography The town of Blankenburg (Harz) lies on the northern edge of the Harz mountains at a height of about 234 metres. It is located west of Quedlinburg, south of Halberstadt and east of Wernigerode. The stream known as the Goldbach flows through the district of Oesig northwest of the town centre. Divisions The town Blankenburg (Harz) consists of Blankenburg proper and the following ''Ortschaften'' or municipal divisions: [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Linnaeus
Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern taxonomy". Many of his writings were in Latin; his name is rendered in Latin as and, after his 1761 ennoblement, as . Linnaeus was born in Råshult, the countryside of Småland, in southern Sweden. He received most of his higher education at Uppsala University and began giving lectures in botany there in 1730. He lived abroad between 1735 and 1738, where he studied and also published the first edition of his ' in the Netherlands. He then returned to Sweden where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on several journeys through Sweden to find and classify plants and animals. In the 1750s and 1760s, he continued to collect an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jan Frederik Gronovius
Jan Frederik Gronovius (also seen as Johann Frederik and Johannes Fredericus) (10 February 1690 in Leiden – 10 July 1762 in Leiden) was a Dutch botanist notable as a patron of Linnaeus. John Clayton, a plant collector in Virginia sent him many specimens, as well as manuscript descriptions, in the 1730s. Without Clayton's knowledge, Gronovius used the material in his ''Flora Virginica'' (1739–43, 2nd ed. 1762). He was the son of Jakob Gronovius and grandson of Johann Friedrich Gronovius Johann Friedrich Gronovius (the Latinized form of Gronow; 8 September 1611 – 28 December 1671) was a German classical scholar, librarian and critic. Born in Hamburg, he studied at several universities and travelled in England, France and ..., both classical scholars. In 1719, he married Margaretha Christina Trigland, who died in 1726, and Johanna Susanna Alensoon in 1729. His son Laurens Theodoor Gronovius (1730–1777) was also a botanist. References External links Clayton h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herman Boerhaave
Herman Boerhaave (, 31 December 1668 – 23 September 1738Underwood, E. Ashworth. "Boerhaave After Three Hundred Years." ''The British Medical Journal'' 4, no. 5634 (1968): 820–25. https://www.jstor.org/stable/20395297.) was a Dutch botanist, chemist, Christian humanist, and physician of European fame. He is regarded as the founder of clinical teaching and of the modern academic hospital and is sometimes referred to as "the father of physiology," along with Venetian physician Santorio Santorio (1561–1636). Boerhaave introduced the quantitative approach into medicine, along with his pupil Albrecht von Haller (1708–1777) and is best known for demonstrating the relation of symptoms to lesions. He was the first to isolate the chemical urea from urine. He was the first physician to put thermometer measurements to clinical practice. His motto was ''Simplex sigillum veri'': 'Simplicity is the sign of the truth'. He is often hailed as the "Dutch Hippocrates". Biography Boerhaave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerard Van Swieten
Gerard van Swieten (7 May 1700 – 18 June 1772) was a Dutch physician who from 1745 was the personal physician of the Holy Roman Empress Maria Theresa and transformed the Austrian health service and medical university education. He was the father of Gottfried van Swieten, patron of Haydn, Mozart and Beethoven. Youth and study Gerard van Swieten was the one surviving child of a prominent Catholic family in Leiden. His parents, the notary Thomas van Swieten (1662–1712) and Elisabeth Loo (†1708), had their children baptized by Jesuit priests, and Van Swieten remained a Roman Catholic throughout his life. His paternal family had been prominent Leiden citizens since the 15th century, carrying a coat of arms with three violins, which Van Swieten modified and adopted when he was made a Baron in 1753. They potentially descended from the old but already extinct noble house of , from the castle Zwieten, though there is no direct evidence for this. Van Swieten was a precocious stude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isaac Lawson
Isaac Lawson (died 1747), was a Scottish physician. He became a student of Leyden University on 17 May 1730. There he studied medicine and botany under Herman Boerhaave and Adriaan van Royen, and became the intimate friend of Linnaeus, whom he several times assisted with gifts of money. In conjunction with Jan Frederik Gronovius he was at the expense of the printing of the ''Systema Naturæ'' of Linnaeus in 1735. Lawson obtained his doctorate in medicine on December 28, 1737 in Leiden with a thesis on zinc oxide, his thesis being entitled ''Dissertatio Academica sistens Nihil.'' From spring to autumn 1738 he undertook an extensive trip to the most famous German mining, mines, during which he made extensive minerals for his private mineral collection. Via Hanover he first arrived in Goslar. From there he went on excursions to Zellerfeld and Clausthal. Three weeks later he traveled on to Sankt Andreasberg. He sent samples of his collected minerals to Hieronymus David Gaubius, Johann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flux (metallurgy)
In metallurgy, a flux () is a chemical cleaning agent, flowing agent, or purifying agent. Fluxes may have more than one function at a time. They are used in both extractive metallurgy and metal joining. Some of the earliest known fluxes were sodium carbonate, potash, charcoal, coke, borax, lime, lead sulfide and certain minerals containing phosphorus. Iron ore was also used as a flux in the smelting of copper. These agents served various functions, the simplest being a reducing agent, which prevented oxides from forming on the surface of the molten metal, while others absorbed impurities into the slag, which could be scraped off the molten metal. Fluxes are also used in foundries for removing impurities from molten nonferrous metals such as aluminium, or for adding desirable trace elements such as titanium. As cleaning agents, fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined. In some applications molten flux also serve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
