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Christian Hülsmeyer
Christian Hülsmeyer (Huelsmeyer) (25 December 1881 – 31 January 1957) was a German inventor, physicist and entrepreneur. He is credited with the invention of radar, although his apparatus, called the "Telemobiloscope," could not directly measure distance to a target. The Telemobiloscope was, however, the first patented device using radio waves for detecting the presence of distant objects like ships. Background Hülsmeyer was born at Eydelstedt, a village in Lower Saxony, Germany. He was the youngest of five children of Johann Heinrich Ernst Meyer and Elisabeth Wilhelmine Brenning. His birth name was Johann Christel, but after early childhood the name Christian was used. Following completion of the local ''Volksschule'' (elementary school), he attended ''Grundschule'' (primary school) in nearby Donstorf. A teacher there recognized his capabilities and, in 1896, assisted him in gaining admission to the ''Lehrerseminare'' (Teacher Training College) in Bremen. At the school, his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eydelstedt
Eydelstedt is a municipality in the district of Diepholz, in Lower Saxony, Germany. People * Christian Hülsmeyer Christian Hülsmeyer (Huelsmeyer) (25 December 1881 – 31 January 1957) was a German inventor, physicist and entrepreneur. He is credited with the invention of radar, although his apparatus, called the "Telemobiloscope," could not directly measu ... (1881-1957), German inventor, physicist and entrepreneur References Diepholz (district) {{Diepholz-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coherer
The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was based on the 1890 findings of French physicist Édouard Branly and adapted by other physicists and inventors over the next ten years. The device consists of a tube or capsule containing two electrodes spaced a small distance apart with loose metal filings in the space between. When a radio frequency signal is applied to the device, the metal particles would cling together or " cohere", reducing the initial high resistance of the device, thereby allowing a much greater direct current to flow through it. In a receiver, the current would activate a bell, or a Morse paper tape recorder to make a record of the received signal. The metal filings in the coherer remained conductive after the signal (pulse) ended so that the coherer had to be "decohered" by tapping it with a clapper actuated by an electroma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ahrweiler
Bad Neuenahr-Ahrweiler () is a spa town in the German Bundesland of Rhineland-Palatinate that serves as the capital of the Ahrweiler district. The A61 motorway connects the town with cities like Cologne and Mainz. Formed by the merging of the towns (now districts) of Bad Neuenahr and Ahrweiler in 1969, Bad Neuenahr-Ahrweiler consists of 11 such districts. Geography Bad Neuenahr-Ahrweiler rests in the Ahr valley (german: Ahrtal) on the left bank of the Rhine river in the north of Rhineland-Palatinate. Bad Neuenahr-Ahrweiler nestles in the Ahr Hills (german: Ahrgebirge). The highest hill in the area is the Häuschen at metres above sea level. Nearby are the hills of Steckenberg, Neuenahrer, and Talerweiterung. There used to be castles on the last two of these hills. Neighbouring communities Bad Neuenahr-Ahrweiler is surrounded by the following villages and towns (clockwise from the north): Grafschaft, Remagen, Sinzig, Königsfeld, Schalkenbach, Heckenbach, Kesseling, Rech a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deutsches Museum
The Deutsches Museum (''German Museum'', officially (English: ''German Museum of Masterpieces of Science and Technology'')) in Munich, Germany, is the world's largest museum of science and technology, with about 28,000 exhibited objects from 50 fields of science and technology. It receives about 1.5 million visitors per year. The museum was founded on 28 June 1903, at a meeting of the Association of German Engineers (VDI) as an initiative of Oskar von Miller. It is the largest museum in Munich. For a period of time the museum was also used to host pop and rock concerts including The Who, Jimi Hendrix and Elton John. Museumsinsel The main site of the Deutsches Museum is a small island in the Isar river, which had been used for rafting wood since the Middle Ages. The island did not have any buildings before 1772 because it was regularly flooded prior to the building of the Sylvensteinspeicher. In 1772 the Isar barracks were built on the island and, after the flooding of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IEEE MILESTONE Demonstration Of A Radar Predecessor, 1904
The Institute of Electrical and Electronics Engineers (IEEE) is a 501(c)(3) professional association for electronic engineering and electrical engineering (and associated disciplines) with its corporate office in New York City and its operations center in Piscataway, New Jersey. The mission of the IEEE is ''advancing technology for the benefit of humanity''. The IEEE was formed from the amalgamation of the American Institute of Electrical Engineers and the Institute of Radio Engineers in 1963. Due to its expansion of scope into so many related fields, it is simply referred to by the letters I-E-E-E (pronounced I-triple-E), except on legal business documents. , it is the world's largest association of technical professionals with more than 423,000 members in over 160 countries around the world. Its objectives are the educational and technical advancement of electrical and electronic engineering, telecommunications, computer engineering and similar disciplines. History Origins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Watson-Watt
Sir Robert Alexander Watson Watt (13 April 1892 – 5 December 1973) was a Scottish pioneer of radio direction finding and radar technology. Watt began his career in radio physics with a job at the Met Office, where he began looking for accurate ways to track thunderstorms using the radio signals given off by lightning. This led to the 1920s development of a system later known as high-frequency direction finding (HFDF or "huff-duff"). Although well publicized at the time, the system's enormous military potential was not developed until the late 1930s. Huff-duff allowed operators to determine the location of an enemy radio in seconds and it became a major part of the network of systems that helped defeat the threat of German U-boats during World War II. It is estimated that huff-duff was used in about a quarter of all attacks on U-boats. In 1935 Watt was asked to comment on reports of a German death ray based on radio. Watt and his assistant Arnold Frederic Wilkins quickly dete ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frankfurt
Frankfurt, officially Frankfurt am Main (; Hessian: , "Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on its namesake Main River, it forms a continuous conurbation with the neighboring city of Offenbach am Main and its urban area has a population of over 2.3 million. The city is the heart of the larger Rhine-Main metropolitan region, which has a population of more than 5.6 million and is Germany's second-largest metropolitan region after the Rhine-Ruhr region. Frankfurt's central business district, the Bankenviertel, lies about northwest of the geographic center of the EU at Gadheim, Lower Franconia. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhine Franconian dialect area. Frankfurt was a city state, the Free City of Frankfurt, for nearly five centuries, and was one of the most import ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Düsseldorf-Flingern
Flingern is a quarter of Düsseldorf, part of Borough 2. Located northeast of Düsseldorf (proper), it is divided into two ''Stadtteile'' today: Flingern-Nord and Flingern-Süd. While Flingern-Nord has a younger population and is more attractive to middle-class families, Flingern-Süd is still mostly home to working-class people. Flingern has an area of , and 36,151 inhabitants (2020). Flingern was first mentioned in 1193 as a forested area that was ruled by the Knights Hayc of Flingern. In the 13th and 14th centuries the City of Düsseldorf grew on the grounds of the Knights Hayc von Flingern. By the end of the 14th century the knights lost their influence. Jan Wellem, Elector Palantine, constructed the Flinger ''Steinweg'' which was a paved road leading from Düsseldorf through Flingern to Gerresheim. During the Industrial Revolution Flingern became an industrial and working class town and to this day it has many old and new factories. Only the old facade remains of the o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi Company
The Marconi Company was a British telecommunications and engineering company that did business under that name from 1963 to 1987. Its roots were in the Wireless Telegraph & Signal Company founded by Italian inventor Guglielmo Marconi in 1897, which underwent several changes in name after mergers and acquisitions. The company was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies. In 1999, its defence equipment manufacturing division, Marconi Electronic Systems, merged with British Aerospace (BAe) to form BAE Systems. In 2006, financial difficulties led to the collapse of the remaining company, with the bulk of the business acquired by the Swedish telecommunications company, Ericsson. History Naming history *1897–1900: The Wireless Telegraph & Signal Company *1900–1963: Marconi's Wireless Telegraph Company *1963–1987: Marconi Company Ltd *1987–1998: GEC-Marconi Ltd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RLC Circuits
An RLC circuit is an electrical circuit consisting of a resistor (R), an inductor (L), and a capacitor (C), connected in series or in parallel. The name of the circuit is derived from the letters that are used to denote the constituent components of this circuit, where the sequence of the components may vary from RLC. The circuit forms a harmonic oscillator for current, and resonates in a manner similar to an LC circuit. Introducing the resistor increases the decay of these oscillations, which is also known as damping. The resistor also reduces the peak resonant frequency. Some resistance is unavoidable even if a resistor is not specifically included as a component. RLC circuits have many applications as oscillator circuits. Radio receivers and television sets use them for tuning to select a narrow frequency range from ambient radio waves. In this role, the circuit is often referred to as a tuned circuit. An RLC circuit can be used as a band-pass filter, band-stop filter, low-p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hook Of Holland
Hook of Holland ( nl, Hoek van Holland, ) is a town in the southwestern corner of Holland, hence the name; ''hoek'' means "corner" and was the word in use before the word ''kaap'' – "cape", from Portuguese ''cabo'' – became Dutch. The English translation using Hook is a false cognate of the Dutch Hoek, but has become commonplace (in official government records in English, the name tends not to get translated and Hoek van Holland is used). It is located at the mouth of the New Waterway shipping canal into the North Sea. The town is administered by the municipality of Rotterdam as a district of that city. Its district covers an area of 16.7 km2, of which 13.92 km2 is land. On 1 January 1999 it had an estimated population of 9,400. Towns near "the Hook" ( nl, "de Hoek") include Monster, 's-Gravenzande, Naaldwijk and Delft to the northeast, and Maassluis to the southeast. On the other side of the river is the Europort and the Maasvlakte. The wide sandy beach, one sectio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotterdam
Rotterdam ( , , , lit. ''The Dam on the River Rotte'') is the second largest city and municipality in the Netherlands. It is in the province of South Holland, part of the North Sea mouth of the Rhine–Meuse–Scheldt delta, via the ''"New Meuse"'' inland shipping channel, dug to connect to the Meuse first, but now to the Rhine instead. Rotterdam's history goes back to 1270, when a dam was constructed in the Rotte. In 1340, Rotterdam was granted city rights by William IV, Count of Holland. The Rotterdam–The Hague metropolitan area, with a population of approximately 2.7 million, is the 10th-largest in the European Union and the most populous in the country. A major logistic and economic centre, Rotterdam is Europe's largest seaport. In 2020, it had a population of 651,446 and is home to over 180 nationalities. Rotterdam is known for its university, riverside setting, lively cultural life, maritime heritage and modern architecture. The near-complete destruction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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