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Carl A. Stetefeldt
Carl August Stetefeldt (born in Holzhausen, near Gotha, Germany, 28 September 1838; died in Oakland, California, 17 March 1896) was an American mining engineer. Biography His father was a Lutheran clergyman who moved the family to Hörselgau in 1847 where, in addition to his clerical work, he ran a school to prepare students for entering a gymnasium. His son was among the students, and entered the gymnasium in Gotha in 1852. In a rebellious act, Stetefeldt escaped the study of Hebrew there, being more attracted to the natural sciences. With other students, he founded the ''Naturwissenschaftliche Verein der Gymnasiasten zu Gotha''. In 1858, he entered the University of Göttingen, and in 1860 the mining school in Clausthal, where he graduated in 1862. Directly after his graduation, he was commissioned to investigate a problem in copper processing at the government works in the Harz. After visiting Freiberg, Mansfeld, Stolberg, and other metallurgical centers, he man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holzhausen, Amt Wachsenburg
Amt Wachsenburg is a municipality in the district Ilm-Kreis, in Thuringia, Germany. The municipality is named after the Wachsenburg Castle which is located in its center. It was formed on 31 December 2012 from the former municipalities Wachsenburggemeinde and Ichtershausen. The former municipality Kirchheim was merged into Amt Wachsenburg in January 2019, and Rockhausen in December 2019. It consists of the villages Bechstedt-Wagd, Bittstädt, Eischleben, Haarhausen, Holzhausen, Ichtershausen, Kirchheim, Rehestädt, Rockhausen, Röhrensee, Sülzenbrücken, Thörey Thörey is a village near Ichtershausen in Ilm-Kreis, Thuringia, Germany, with about 250 inhabitants. It is part of the municipality Amt Wachsenburg Amt Wachsenburg is a municipality in the district Ilm-Kreis, in Thuringia, Germany. The municipal ... and Werningsleben. References Ilm-Kreis Saxe-Coburg and Gotha {{IlmKreis-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver
Silver is a chemical element with the Symbol (chemistry), symbol Ag (from the Latin ', derived from the Proto-Indo-European wikt:Reconstruction:Proto-Indo-European/h₂erǵ-, ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc Refining (metallurgy), refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes bimetallism, alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reno, Nevada
Reno ( ) is a city in the northwest section of the U.S. state of Nevada, along the Nevada-California border, about north from Lake Tahoe, known as "The Biggest Little City in the World". Known for its casino and tourism industry, Reno is the county seat and largest city of Washoe County and sits in the High Eastern Sierra foothills, in the Truckee River valley, on the eastern side of the Sierra Nevada. The Reno metro area (along with the neighboring city Sparks) occupies a valley colloquially known as the Truckee Meadows which because of large-scale investments from Greater Seattle and San Francisco Bay Area companies such as Amazon, Tesla, Panasonic, Microsoft, Apple, and Google has become a new major technology center in the United States. The city is named after Civil War Union Major General Jesse L. Reno, who was killed in action during the American Civil War at the Battle of South Mountain, on Fox's Gap. Reno is part of the Reno–Sparks metropolitan area, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pan Amalgamation
The pan amalgamation process is a method to extract silver from ore, using salt and copper(II) sulfate in addition to mercury. The process was widely used from 1609 through the 19th century; it is no longer used. The patio process had been used to extract silver from ore since its invention in 1557. One drawback of the patio process was the long treatment time, usually weeks. Alvaro Alonso Barba invented the faster ''pan'' process (in Spanish the ''cazo'' or ''fondo'' process) in 1609 in Potosí, Bolivia, in which ore was mixed with salt and mercury (and sometimes copper(II) sulfate) and heated in shallow copper vessels. The treatment time was reduced to 10 to 20 hours. Whether patio or pan amalgamation was used at a particular location often depended on climate (warmer conditions speeded the patio process) and the availability and cost of fuel to heat the pans. The amount of salt and copper(II) sulfate varied from one-quarter to ten pounds of one or the other, or both, per ton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reese River
The Reese River is a tributary of the Humboldt River, located in central Nevada in the western United States. The Reese rises in the southern section of the Toiyabe Range, on the flanks of Arc Dome. In its upper reaches, the Reese River is a fast-flowing mountain stream surrounded by relatively lush growth, including Aspen groves and cottonwood trees. It then flows north between the Toiyabe Range and the Shoshone Mountains for approximately half its length. The river then passes through a low point in the Shoshone Mountains and continues north between that range and the Fish Creek Mountains. Once it exits the Toiyabe Range, it becomes a slow, muddy stream, and its waters are used for irrigation by scattered farms and ranches along its lower reaches. Although considered a tributary of the Humboldt, in most years, the Reese dwindles into a chain of shallow pools long before it reaches the main stem. Only during infrequent floods does the Reese contribute water to the Humboldt, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Austin, Nevada
Austin is an unincorporated small town in, and former county seat of, Lander County, Nevada, United States. In 2020, the census-designated place of Austin had a population of 167. It is located on the western slopes of the Toiyabe Range at an elevation of . U.S. Route 50 passes through the town. History The Austin area was originally occupied by bands of the Western Shoshone people. The city of Austin was mapped out in 1862 by David Buell. This was during the American Civil War, and the Union was eager to find new sources of precious metals, especially gold, to support the war effort. The city was named after Buell's partner, Alvah Austin, during a silver rush. The valued metal was reputedly found when a Pony Express horse kicked over a rock and observers noticed the silver. In 1862, it was designated as the county seat of Lander County. (In 1979, after the center of population had shifted, the county seat was shifted to Battle Mountain.) By summer 1863, Austin and the surr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John H
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope Jo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemistry
Chemistry is the science, scientific study of the properties and behavior of matter. It is a natural science that covers the Chemical element, elements that make up matter to the chemical compound, compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a Chemical reaction, reaction with other Chemical substance, substances. Chemistry also addresses the nature of chemical bonds in chemical compounds. In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both Basic research, basic and Applied science, applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mathematics
Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics with the major subdisciplines of number theory, algebra, geometry, and analysis, respectively. There is no general consensus among mathematicians about a common definition for their academic discipline. Most mathematical activity involves the discovery of properties of abstract objects and the use of pure reason to prove them. These objects consist of either abstractions from nature orin modern mathematicsentities that are stipulated to have certain properties, called axioms. A ''proof'' consists of a succession of applications of deductive rules to already established results. These results include previously proved theorems, axioms, andin case of abstraction from naturesome basic properties that are considered true starting points of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Arents
Albert Arents (March 14, 1840, Clausthal, Germany – May 13, 1914) was a German-American metallurgist. He was one of a group of German-trained mining engineers who helped develop the mineral assets of the Rocky Mountains. He worked primarily with lead. He is chiefly known for his inventions. Biography He was educated at University of Berlin and the mining school in Clausthal. After coming to the United States in 1865 to work in a small lead mine in Hampden County, Massachusetts, he headed for the western U.S. in 1866, where he was variously occupied as superintendent of mining, metallurgical mills, and smelters in Arizona, California, Colorado, Nevada, and Utah. He contributed technical papers to the ''Transactions of the American Institute of Mining Engineers'', having been elected a member of that society in 1882. Among his inventions are the siphon tap, used on lead furnaces; the Eureka lead furnace, extensively employed throughout Colorado and Utah; and a roasting furnace t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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