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Marconi Company
The Marconi Company was a British telecommunications and engineering company founded by Italian inventor Guglielmo Marconi in 1897 which was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies. Its roots were in the Wireless Telegraph & Signal Company, which underwent several changes in name after mergers and acquisitions. 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 * 1998–1999: Marconi Electronic Systems, Marconi Elec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Electric Company
The General Electric Company (GEC) was a major British industrial conglomerate involved in consumer and Arms industry, defence electronics, communications, and engineering. It was originally founded in 1886 as G. Binswanger and Company as an electrical goods wholesaler based in London. It quickly adopted a then-unorthodox business model of supplying electrical components over the counter. In 1889, the business was incorporated as the General Electric Company Ltd, and became a public limited company 11 years later. During the 1890s and 1900s, the company heavily invested into electric lighting, a sector that proved to be immensely profitable in the long term. The GEC was heavily impacted by the outbreak of the First World War, supplying various goods to the military, and thus becoming a major player in the electrical industry. In 1921, a new purpose-built company headquarters (Magnet House) was opened in Kingsway, London; two years later, GEC's industrial research laboratories at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi Communications
Marconi Communications was the former telecommunications arm of Britain's General Electric Company plc (GEC). It was founded in August 1998 through the amalgamation of GEC Plessey Telecommunications (GPT) with other GEC subsidiaries: Marconi SpA, GEC Hong Kong, and ATC South Africa. In December 1999, it became the principal subsidiary of Marconi plc, formed by renaming the remainder of GEC when GEC's defence arm, Marconi Electronic Systems, was sold to British Aerospace to form BAE Systems. Marconi plc was restructured to Marconi Corporation plc in May 2003. Marconi Corporation used the cash raised by selling the defence arm to buy US telecoms companies, with the aim of becoming a major telecommunications systems provider. After losing most of its value in the subsequent dot-com bubble crash, and failing to win major contracts, in 2006 Ericsson acquired a majority of Marconi Corporation. The remainder of Marconi Corporation was renamed Telent. History Companies with "Marco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Broadcasting Company
The British Broadcasting Company Limited (BBC) was a short-lived British commercial broadcasting company formed on 18 October 1922 by British and American electrical companies doing business in the United Kingdom. Licensed by the British General Post Office, its original office was located on the second floor of Magnet House, the GEC buildings in London and consisted of a room and a small antechamber. On 14 December 1922, John Reith was hired to become the managing director of the company at that address. The company later moved its offices to the premises of the Marconi Company. The BBC as a commercial broadcasting company did not sell air time but it did carry a number of sponsored programmes paid for by British newspapers. On 31 December 1926, the company was dissolved and its assets were transferred to the non-commercial and crown-chartered British Broadcasting Corporation (BBC). Brief history Post Office stations In Britain prior to 1922, the General Post Office (GPO) r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuner (radio)
In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker. A tuner is also a standalone home audio product, component, or device called an AM/FM tuner or a stereo tuner that is part of a hi-fi or stereo system, or a TV tuner for television broadcasts. The verb ''tuning'' in radio contexts means adjusting the receiver to detect the desired radio signal carrier frequency that a particular radio station uses. Tuners were a major consumer electronics product in the 20th century but in practice are often integrated into other products in the modern day, such as stereo or AV receivers or portable radios. Design history and overview The purpose of a tuner's design is to reduce noise and have a strong ability to amplify the wanted signal. Tuners may be monophonic or s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Frequency
High frequency (HF) is the ITU designation for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted '' medium frequency'' (MF), while the next band of higher frequencies is known as the '' very high frequency'' (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called ''shortwave radio''. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave" propagation – these frequencies can be used for long-distance communication across intercontinental distances and for mountainous terrains which prevent line-of-sight communications. The band is used by international shortwave broadcasting stations (3.95–25.8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glace Bay
Glace Bay (Scottish Gaelic: ''Glasbaidh'') is a community in the eastern part of the Cape Breton Regional Municipality in Nova Scotia, Canada. It forms part of the general area referred to as Industrial Cape Breton. Formerly an incorporated town (1901–1995), the municipal government in Glace Bay was dissolved and the community was amalgamated into the larger regional municipality. Prior to amalgamation, Glace Bay had been the province's fourth largest urban area and the largest town in Nova Scotia by population. Neighbouring communities include Reserve Mines, Dominion, Nova Scotia, Dominion, and Tower Road. History As early as the 1720s, the France, French inhabited the area to supply Fortress of Louisbourg with coal. They named the location ''baie de Glace'' (literally, ''Bay of Ice'') because of the sea ice which filled the ocean each winter. In 1748, after the capture of Fortress Louisbourg, the British constructed Fort William at Table Head in order to protect a mine t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clifden
Clifden () is a coastal town in County Galway, Ireland, in the region of Connemara, located on the Owenglin River where it flows into Clifden Bay. As the largest town in the region, it is often referred to as "the Capital of Connemara". Frequented by tourists, Clifden is linked to Galway city by the N59 road, N59. History 19th century The town was founded at the start of the 19th century by John D'Arcy (1785–1839), John D'Arcy who lived in Clifden Castle (built around 1818, now a ruin) west of Clifden. He had inherited the estate in 1804 when it was mostly inhabited by fishermen and farmers. The idea of establishing a town on the coast was first voiced by him in 1812. Bad communications and a lack of private capital prevented fast progress until the 1820s when the potato crop failed in 1821–22 and D'Arcy petitioned the government in Dublin for assistance. The engineer Alexander Nimmo was sent to the area in 1822. He constructed a quay at Clifden (finished in 1831) and start ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transatlantic Crossing
Transatlantic crossings are passages of passengers and cargo across the Atlantic Ocean between Europe or Africa and the Americas. The majority of passenger traffic is across the North Atlantic between Western Europe and North America. Centuries after the dwindling of sporadic Viking trade with Markland, a regular and lasting transatlantic trade route was established in 1566 with the Spanish Spanish treasure fleet, West Indies fleets, following the voyages of Christopher Columbus. By sea Prior to the 19th century, transatlantic crossings were undertaken in sailing ships, and the journeys were time-consuming and often perilous. The first trade route across the Atlantic was inaugurated by Spain a few decades after the European Discovery of the Americas, with the establishment of the Spanish treasure fleet, West Indies fleets in 1566, a convoy system that regularly linked its territories in the Viceroyalty of New Spain, Americas with Spain for over two centuries. Portugal created ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Ambrose Fleming
Sir John Ambrose Fleming (29 November 1849 – 18 April 1945) was an English electrical engineer who invented the vacuum tube, designed the radio transmitter with which the first transatlantic radio transmission was made, and also established the right-hand rule used in physics. He was born in Lancaster, Lancashire and was baptised on 11 February 1850, the eldest of seven children of James Fleming DD (died 1879), a Congregational minister, and his wife Mary Ann. A devout Christian, he once preached at St Martin-in-the-Fields in London on evidence for the resurrection. In 1932, he and Douglas Dewar and Bernard Acworth helped establish the Evolution Protest Movement. Fleming bequeathed much of his estate to Christian charities, especially those for the poor. He was a noted photographer, painted watercolours, and enjoyed climbing the Alps. Early years Ambrose Fleming was born in Lancaster and educated at Lancaster Royal Grammar School, University College School, London, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube
A vacuum tube, electron tube, thermionic 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 voltage, potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental Electronics, electronic functions such as signal amplifier, amplification and current Rectifier, rectification. Non-thermionic types such as vacuum phototubes achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light and measurement of its intensity. In both types the electrons are accelerated from the cathode to the anode by the electric field in the tube. The first, and simplest, vacuum tube, the diode or Flem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diode
A diode is a two-Terminal (electronics), terminal electronic component that conducts electric current primarily in One-way traffic, one direction (asymmetric electrical conductance, conductance). It has low (ideally zero) Electrical resistance and conductance, resistance in one direction and high (ideally infinite) resistance in the other. A semiconductor diode, the most commonly used type today, is a Crystallinity, crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. It has an Exponential function, exponential current–voltage characteristic. Semiconductor diodes were the first Semiconductor device, semiconductor electronic devices. The discovery of asymmetric electrical conduction across the contact between a Crystal, crystalline mineral and a metal was made by German physicist Ferdinand Braun in 1874. Today, most diodes are made of silicon, but other semiconducting materials such as gallium arsenide and germanium are also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chelmsford
Chelmsford () is a city in the City of Chelmsford district in the county of Essex, England. It is the county town of Essex and one of three cities in the county, along with Colchester and Southend-on-Sea. It is located north-east of London at Charing Cross and south-west of Colchester. The population of the urban area was 110,625 in the 2021 Census, while the wider district has 181,763. The main conurbation of Chelmsford incorporates all or part of the former parishes of Broomfield, Newland Spring, Great Leighs, Great Waltham, Little Waltham, Great Baddow, Little Baddow, Galleywood, Howe Green, Margaretting, Pleshey, Stock, Roxwell, Danbury, Bicknacre, Writtle, Moulsham, Rettendon, The Hanningfields, The Chignals, Widford and Springfield, including Springfield Barnes, now known as Chelmer Village. The communities of Chelmsford, Massachusetts; Chelmsford, Ontario; and Chelmsford, New Brunswick, are named after the city. The demonym for a Chelmsford r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
