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C. Lorenz AG
C. Lorenz AG (1880–1958) was a German electrical and electronics firm primarily located in Berlin. It innovated, developed, and marketed products for electric lighting, telegraphy, telephony, radar, and radio. It was acquired by ITT in 1930 and became part of the newly founded company Standard Elektrik Lorenz (SEL) Stuttgart in 1958, when it merged with Standard Elektrizitätsgesellschaft and several other smaller companies owned by ITT. In 1987, SEL merged with the French companies Compagnie Générale d'Electricité and Alcatel to form the new Alcatel SEL. History Around 1870, Carl Lorenz (1844–1889) opened a shop in Berlin to manufacture electrical lighting products. The shop entered the telegraph field in 1880, taking the name ''C. Lorenz Telegraphenbauanstalt''. Following the death of Carl Lorenz, the firm was acquired in 1890 by textile businessman Robert Held (1862–1924). Held retained the firm's original name, and Carl's brother, Alfred Lorenz, was made the technic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telegraphy
Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of transmitting arbitrary text messages. Possible messages were fixed and predetermined and such systems are thus not true telegraphs. The earliest true telegraph put into widespread use was the optical telegraph of Claude Chappe, invented in the late 18th century. The system was used extensively in France, and European nations occupied by France, during the Napoleonic era. The electric telegraph started to replace the optical telegraph in the mid-19th century. It was first taken up in Britain in the form of the Cooke and Wheatstone telegraph, initially used mostly as an aid to railway signalling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lorenz Cipher
The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II. They were developed by C. Lorenz AG in Berlin. The model name ''SZ'' was derived from ''Schlüssel-Zusatz'', meaning ''cipher attachment''. The instruments implemented a Vernam stream cipher. British cryptanalysts, who referred to encrypted German teleprinter traffic as ''Fish'', dubbed the machine and its traffic ''Tunny'' (meaning tunafish) and deduced its logical structure three years before they saw such a machine. The SZ machines were in-line attachments to standard teleprinters. An experimental link using SZ40 machines was started in June 1941. The enhanced SZ42 machines were brought into substantial use from mid-1942 onwards for high-level communications between the German High Command in Wünsdorf close to Berlin, and Army Commands throughout occupied Europe. The more advanced SZ42A came into routine use in February 1943 and the SZ42B in June 1944. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pforzheim
Pforzheim () is a city of over 125,000 inhabitants in the federal state of Baden-Württemberg, in the southwest of Germany. It is known for its jewelry and watch-making industry, and as such has gained the nickname "Goldstadt" ("Golden City"). With an area of , it is situated between the cities of Stuttgart and Karlsruhe at the confluence of three rivers ( Enz, Nagold and Würm). It marks the frontier between Baden and Württemberg, being located on Baden territory. From 1535-65, it was the home to the Margraves of Baden-Pforzheim. The City of Pforzheim does not belong to any administrative district (''Kreis''), although it hosts the administrative offices of the Enz district that surrounds the town. During World War II, Pforzheim was bombed by the Allies a number of times. The largest raid, and one of the most devastating area bombardments of World War II, was carried out by the Royal Air Force (RAF) on the evening of 23 February 1945. Nearly one third of the town's popul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landshut
Landshut (; bar, Landshuad) is a town in Bavaria in the south-east of Germany. Situated on the banks of the River Isar, Landshut is the capital of Lower Bavaria, one of the seven administrative regions of the Free State of Bavaria. It is also the seat of the surrounding district, and has a population of more than 70,000. Landshut is the largest city in Lower Bavaria, followed by Passau and Straubing, and Eastern Bavaria's second biggest city. Owing to its characteristic coat of arms, the town is also often called "City of the three Helmets" (german: Dreihelmenstadt). Furthermore, the town is popularly known for the Landshuter Hochzeit ( Landshut Wedding), a full-tilt medieval festival. Due to its proximity and easy access to Munich and the Franz Josef Strauss International Airport, Landshut became a powerful and future-oriented investment area. The town is one of the richest industrialized towns in Bavaria and has East Bavaria's lowest unemployment rate. Geography Setti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Esslingen Am Neckar
Esslingen am Neckar (Swabian: ''Esslenga am Neckor'') is a town in the Stuttgart Region of Baden-Württemberg in southern Germany, seat of the District of Esslingen as well as the largest town in the district. Within Baden-Württemberg it is the 11th largest city. It is located on the river Neckar, about southeast of Stuttgart city center. The regions surrounding the city of Esslingen are also mostly developed. Esslingen was a free imperial city for several centuries until it was annexed by Württemberg in 1802. The German Timber-Frame Road passes through the city. History Prehistoric times There is archaeological evidence that what is now the city of Esslingen was settled since the Neolithic period. Traces of human settlement found at the site of the city church date back to around 1000 B.C. Roman times In the 1st century AD the Esslingen region became part of the Roman Empire. During this period a Roman warehouse was located in the area of Oberesslingen. The nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zuffenhausen
Zuffenhausen is one of three northernmost boroughs of the city of Stuttgart, capital of the German state of Baden-Württemberg. The borough is primarily an incorporation of the formerly independent townships Zuffenhausen, Zazenhausen, Neuwirtshaus, and Rot, the latter is a historic town that gained importance in 1945 as a refugee camp for German refugees. As of 2009 around 35,000 people lived in Zuffenhausen's area of , making it the third largest of Stuttgart's outer boroughs. Zuffenhausen is also one of the oldest continuously inhabited places in Stuttgart with evidence of permanent settlements that can be traced back 7,500 years. The etymological roots of "Zuffenhausen" are assumed to be found in the name of a seventh century Alemanni settler "''Uffo''" or "''Offo''". The oldest known official denotation as a property of Bebenhausen Abbey by Pope Innocent III dates to May 18, 1204. Zuffenhausen was proclaimed a city in 1907, yet soon financially badly affected by the Great De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buchenwald
Buchenwald (; literally 'beech forest') was a Nazi concentration camp established on hill near Weimar, Germany, in July 1937. It was one of the first and the largest of the concentration camps within Germany's 1937 borders. Many actual or suspected communists were among the first internees. Prisoners came from all over Europe and the Soviet Union—Jews, Poles and other Slavs, the mentally ill and physically disabled, political prisoners, Romani people, Freemasons, and prisoners of war. There were also ordinary criminals and sexual "deviants". All prisoners worked primarily as forced labor in local armaments factories. The insufficient food and poor conditions, as well as deliberate executions, led to 56,545 deaths at Buchenwald of the 280,000 prisoners who passed through the camp and its 139 subcamps. The camp gained notoriety when it was liberated by the United States Army in April 1945; Allied commander Dwight D. Eisenhower visited one of its subcamps. From August 1945 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hanover
Hanover (; german: Hannover ; nds, Hannober) is the capital and largest city of the German state of Lower Saxony. Its 535,932 (2021) inhabitants make it the 13th-largest city in Germany as well as the fourth-largest city in Northern Germany after Berlin, Hamburg and Bremen. Hanover's urban area comprises the towns of Garbsen, Langenhagen and Laatzen and has a population of about 791,000 (2018). The Hanover Region has approximately 1.16 million inhabitants (2019). The city lies at the confluence of the River Leine and its tributary the Ihme, in the south of the North German Plain, and is the largest city in the Hannover–Braunschweig–Göttingen–Wolfsburg Metropolitan Region. It is the fifth-largest city in the Low German dialect area after Hamburg, Dortmund, Essen and Bremen. Before it became the capital of Lower Saxony in 1946, Hannover was the capital of the Principality of Calenberg (1636–1692), the Electorate of Hanover (1692–1814), the Kingdom of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplification and current rectification. Non-thermionic types such as a vacuum phototube, however, achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light intensities. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. The simplest vacuum tube, the diode (i.e. Fleming valve), invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mühlhausen
Mühlhausen () is a city in the north-west of Thuringia, Germany, north of Niederdorla, the country's geographical centre, north-west of Erfurt, east of Kassel and south-east of Göttingen. Mühlhausen was first mentioned in 967 and became one of the most important cities in central Germany in the late Middle Ages. In the mid-13th century, it became a '' Freie Reichsstadt'', an independent and republican self-ruled member of the Holy Roman Empire, controlling an area of approximately and 19 regional villages. Due to its long-distance trade, Mühlhausen was prosperous and influential with a population of 10,000 around 1500. Because it was spared from later destruction, Mühlhausen today has a great variety of historical buildings with one of the largest medieval city centres remaining in Germany, covering a surface of more than 50 hectares within the inner city wall and approximately 200 hectares overall. There are eleven Gothic churches, several patricians’ houses an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plauen
Plauen (; Czech: ''Plavno'') is, with around 65,000 inhabitants, the fifth-largest city of Saxony, Germany after Leipzig, Dresden, Chemnitz and Zwickau, the second-largest city of the Vogtland after Gera, as well as the largest city in the Saxon Vogtland (German: ''Sächsisches Vogtland''). The city lies on the river White Elster (''Weiße Elster''; a tributary of the Saale), in the Central Vogtlandian Hill Country. Plauen is the southwesternmost city of a string of cities sitting in the densely populated foreland of the Elster and Ore Mountains, stretching from Plauen in the southwest via Zwickau, Chemnitz and Freiberg to Dresden in the northeast. It is the capital of the Vogtland District. Plauen borders Thuringia to the north, and it is also situated near the Saxon border with Bavaria (Franconia) and the Czech Republic ( Bohemia). Although being a Saxon city, the regional Vogtlandian dialect spoken in Plauen is a ( Saxon-influenced) East Franconian variant related to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sosthenes Behn
Sosthenes Behn (January 30, 1884 – June 6, 1957) was an American businessman, and the founder of ITT. He held the rank of lieutenant colonel in the U.S. Army. Biography Early years Sosthenes Behn was born in the island of St. Thomas, then part of the Danish West Indies. His ancestry was Danish on his paternal side, and French on his maternal side. Behn served in the United States Army and was commissioned a captain, Signal Corps, on June 19, 1917. He later achieved the rank of Lieutenant Colonel, having served with distinction during World War I. Behn served with the American Expeditionary Force (AEF) in France until February 1919. He was given command of the 232nd Field Signal Battalion, Château-Thierry, Saint-Mihiel, Argonne. In recognition of his meritorious service during the war he was awarded the Distinguished Service Medal (DSM). Puerto Rico Telephone Company and ITT After his return from military service, Colonel Behn co-founded the Puerto Rico Telephone Company whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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