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Döbereiner's Lamp
Döbereiner's lamp, also called a "tinderbox" ("Feuerzeug"), is a lighter invented in 1823 by the German chemist Johann Wolfgang Döbereiner. The lighter is based on the Fürstenberger lighter (invented in Basel in 1780; in which hydrogen gas is ignited by an electrostatically generated spark). Döbereiner's lamp was in production until ca. 1880. In the jar, similar to the Kipp's apparatus, zinc metal reacts with dilute sulfuric acid to produce hydrogen gas. When a valve is opened, a jet of hydrogen is released onto a platinum sponge. The sponge catalyzes a reaction with atmospheric oxygen, which heats the catalyst and ignites the hydrogen, producing a gentle flame. The Döbereiner's lamp is considered as the first commercial application of heterogeneous catalysis and was commercialized for lighting fires and pipes. The world's largest manufacturer of these lighters was Heinrich Gottfried Piegler from Schleiz in Thuringia (Germany). It is said that in the 1820s over a million ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamburg Museum 2010-1207-217
Hamburg (, ; nds, label=Hamburg German, Low Saxon, Hamborg ), officially the Free and Hanseatic City of Hamburg (german: Freie und Hansestadt Hamburg; nds, label=Low Saxon, Friee un Hansestadt Hamborg),. is the List of cities in Germany by population, second-largest city in Germany after Berlin, as well as the overall List of cities in the European Union by population within city limits, 7th largest city and largest non-capital city in the European Union with a population of over 1.85 million. Hamburg's urban area has a population of around 2.5 million and is part of the Hamburg Metropolitan Region, which has a population of over 5.1 million people in total. The city lies on the River Elbe and two of its tributaries, the River Alster and the Bille (Elbe), River Bille. One of Germany's 16 States of Germany, federated states, Hamburg is surrounded by Schleswig-Holstein to the north and Lower Saxony to the south. The official name reflects History of Hamburg, Hamburg's history ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heidelberg Castle
Heidelberg Castle (german: Heidelberger Schloss) is a ruin in Germany and landmark of Heidelberg. The castle ruins are among the most important Renaissance structures north of the Alps. The castle has only been partially rebuilt since its demolition in the 17th and 18th centuries. It is located up the northern part of the Königstuhl hillside, and thereby dominates the view of the old downtown. It is served by an intermediate station on the Heidelberger Bergbahn funicular railway that runs from Heidelberg's Kornmarkt to the summit of the Königstuhl. The earliest castle structure was built before 1214 and later expanded into two castles circa 1294; however, in 1537, a lightning bolt destroyed the upper castle. The present structures had been expanded by 1650, before damage by later wars and fires. In 1764, another lightning bolt caused a fire which destroyed some rebuilt sections. File:Schlossbeleuchtung 10.jpg, alt=, Heidelberg Castle and Old Bridge by night File:Heidelber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Scientist
__NOTOC__ ''American Scientist'' (informally abbreviated ''AmSci'') is an American bimonthly science and technology magazine published since 1913 by Sigma Xi, The Scientific Research Society. In the beginning of 2000s the headquarters was in New Haven, CT. Each issue includes feature articles written by prominent scientists and engineers who review research in fields from molecular biology to computer engineering. Each issue also includes the work of cartoonists, including those of Sidney Harris, Benita Epstein Benita L. Epstein is a prolific gag cartoonist for magazines, greeting cards, websites and newspapers. She was a regular contributor to the comic strip '' Six Chix'', distributed by King Features Syndicate. Before becoming a cartoonist, Epstein e ..., and Mark Heath. Also included is the ''Scientists' Nightstand'' that reviews a vast range of science-related books and novels. ''American Scientist Online'' () was launched in May 2003. References External links ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timeline Of Hydrogen Technologies
This is a timeline of the history of hydrogen technology. Timeline 16th century * c. 1520 – First recorded observation of hydrogen by Paracelsus through dissolution of metals (iron, zinc, and tin) in sulfuric acid. 17th century * 1625 – First description of hydrogen by Johann Baptista van Helmont. First to use the word "gas". * 1650 – Turquet de Mayerne obtained a gas or "inflammable air" by the action of dilute sulphuric acid on iron. * 1662 – Boyle's law (gas law relating pressure and volume) * 1670 – Robert Boyle produced hydrogen by reacting metals with acid. * 1672 – "New Experiments touching the Relation between Flame and Air" by Robert Boyle. * 1679 – Denis Papin – safety valve * 1700 – Nicolas Lemery showed that the gas produced in the sulfuric acid/iron reaction was explosive in air 18th century * 1755 – Joseph Black confirmed that different gases exist. / Latent heat * 1766 – Henry Cavendish published in "On Factitious Airs" a description of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hof, Bavaria
Hof () is a town on the banks of the Saale in the northeastern corner of the German state of Bavaria, in the Franconian region, at the Czech border and the forested Fichtelgebirge and Frankenwald upland regions. The town has 47,296 inhabitants, the surrounding district an additional 95,000. The town of Hof is enclosed by, but does not belong to the Bavarian district of Hof; it is nonetheless the district's administrative seat. The town's most important work of art, the Hofer altar, dates from about 1465 and is exhibited in the Alte Pinakothek in Munich today. The Heidenreich organ in the parish church of St. Michaelis, completed in 1834, is considered one of Bavaria's finest. Hof is known for two local "delicacies", namely , a kind of hotpot, and sausages boiled in a portable, coal-fired brass cauldron, which are sold in the streets by the ''sausage man'' ( in the local dialect). There is also a particularly strong beer (), which is available only on the first Monday after ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jena
Jena () is a German city and the second largest city in Thuringia. Together with the nearby cities of Erfurt and Weimar, it forms the central metropolitan area of Thuringia with approximately 500,000 inhabitants, while the city itself has a population of about 110,000. Jena is a centre of education and research; the Friedrich Schiller University was founded in 1558 and had 18,000 students in 2017 and the Ernst-Abbe-Fachhochschule Jena counts another 5,000 students. Furthermore, there are many institutes of the leading German research societies. Jena was first mentioned in 1182 and stayed a small town until the 19th century, when industry developed. For most of the 20th century, Jena was a world centre of the optical industry around companies such as Carl Zeiss, Schott and Jenoptik (since 1990). As one of only a few medium-sized cities in Germany, it has some high-rise buildings in the city centre, such as the JenTower. These also have their origin in the former Carl Zeiss fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gera
Gera is a city in the German state of Thuringia. With around 93,000 inhabitants, it is the third-largest city in Thuringia after Erfurt and Jena as well as the easternmost city of the ''Thüringer Städtekette'', an almost straight string of cities consisting of the six largest Thuringian cities from Eisenach in the west, via Gotha, Erfurt, Weimar and Jena to Gera in the east. Gera is the largest city in the Vogtland, and one of its historical capitals along with Plauen, Greiz and Weida. The city lies in the East Thuringian Hill Country, in the wide valley of the White Elster, between Greiz (upstream) and Leipzig (downstream). Gera is located in the Central German Metropolitan Region, approximately south of Saxony's largest city of Leipzig, east of Thuringia's capital Erfurt, west of Saxony's capital Dresden and 90 km (56 miles) north of Bavaria's city of Hof (Saale). First mentioned in 995 and developing into a city during the 13th century, Gera has historical sig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeulenroda-Triebes
Zeulenroda-Triebes is a German town in the district of Greiz in the state of Thuringia. Zeulenroda-Triebes is situated in the south of Greiz in the mountains of the Thuringian Slate Mountains (Thüringer Schiefergebirge), on the border with Saxony. The population of Zeulenroda-Triebes in 2006 was about 18,000. The largest company is Bauerfeind AG. The most famous sight in the town is the neoclassical town hall, built in 1827. Zeulenroda-Triebes is also known for the International Thuringia Women's Cycling Tour. Zeulenroda unt Bf station lies on the Werdau–Mehltheuer railway. History Zeulenroda was mentioned in a document as early as 1325. The village became a town in 1438. Zeulenroda belonged to the principality of the House of Reuss Elder Line for several centuries. On April 16, 1945 the United States Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bad Lobenstein
Bad Lobenstein is a spa town in the Saale-Orla-Kreis district, in Thuringia, Germany with a population of about 6,000 inhabitants. Until 2005, the town was named Lobenstein. The town, grouped round a rock, upon which stand the ruins of an old castle, is exceedingly picturesque. It contains a spacious parish church, a palace (until 1824 the residence of the princes of Reuss-Lobenstein-Ebersdorf), and a hydropathic establishment. Local industries include dyeing, brewing and cigar-making. Geography The town is located in the Thuringian Highlands between Thuringian Forest and Franconian Forest, south-westerly of the large Saale, Saale river dams at Hohenwarte and Bleiloch near Gräfenwarth. History The high medieval castle of Lobenstein lies above the center of the town on the right side of the river Lemnitz on a mountain dome. It was used to monitor traffic on the route from Leipzig to Bamberg. Lobenstein was first mentioned in 1250 as the seat of a knight. It was probably a fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kassel
Kassel (; in Germany, spelled Cassel until 1926) is a city on the Fulda River in northern Hesse, Germany. It is the administrative seat of the Regierungsbezirk Kassel and the district of the same name and had 201,048 inhabitants in December 2020. The former capital of the state of Hesse-Kassel has many palaces and parks, including the Bergpark Wilhelmshöhe, which is a UNESCO World Heritage Site. Kassel is also known for the ''documenta'' exhibitions of contemporary art. Kassel has a public university with 25,000 students (2018) and a multicultural population (39% of the citizens in 2017 had a migration background). History Kassel was first mentioned in 913 AD, as the place where two deeds were signed by King Conrad I. The place was called ''Chasella'' or ''Chassalla'' and was a fortification at a bridge crossing the Fulda river. There are several yet unproven assumptions of the name's origin. It could be derived from the ancient ''Castellum Cattorum'', a castle of the C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schweinfurt
Schweinfurt ( , ; ) is a city in the district of Lower Franconia in Bavaria, Germany. It is the administrative centre of the surrounding district (''Landkreis'') of Schweinfurt and a major industrial, cultural and educational hub. The urban agglomeration has 100,200 (2018) and the city's catchment area, including the Main-Rhön region and parts of South Thuringia, 759,000 inhabitants. Schweinfurt was first documented in 791 and is one of the oldest cities in Bavaria. Around 1000 the Margraves of Schweinfurt controlled large parts of northern Bavaria. From the 12th century until 1802 Schweinfurt was a Free imperial city within the Holy Roman Empire, around 1700 a humanistic centre and in 1770 began the 250-year industrial history. During World War II, the Americans suffered their biggest air defeat over Schweinfurt in the Second Raid on Schweinfurt ''(Black Thursday)''. On 11 April 1945, the US Army invaded the city. During the Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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