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Fixed Block Signalling
Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks". Only one train may occupy a block at a time, and the blocks are sized to allow a train to stop within them. That ensures that a train always has time to stop before getting dangerously close to another train on the same line. The block system is referred to in the UK as the ''method of working'', in the US as the ''method of operation'', and in Australia as ''safeworking''. In most situations, a system of signals is used to control the passage of trains between the blocks. When a train enters a block, signals at both ends change to indicate that the block is occupied, typically using red lamps or indicator flags. When a train first enters a block, the rear of the same train has not yet left the previous block, so both blocks are marked as occupied. That ensures there is sligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Block Instrument
Block or blocked may refer to: Arts, entertainment and media Broadcasting * Block programming, the result of a programming strategy in broadcasting * W242BX, a radio station licensed to Greenville, South Carolina, United States known as ''96.3 the Block '' * WFNZ-FM, a radio station licensed to Harrisburg, North Carolina, United States, branded as ''92.7 The Block'' * "Blocked", an episode of the television series ''The Flash (2014 TV series), The Flash'' Music * Block Entertainment, a record label * Blocks Recording Club, a record label * Woodblock (instrument), a small piece of slit drum made from one piece of wood and used as a percussion instrument * "Blocks", by C418 from ''Music of Minecraft#Minecraft – Volume Beta, Minecraft – Volume Beta'', 2013 Toys * Toy block, one of a set of wooden or plastic pieces, of various shapes * Unit block, a type of standardized wooden toy block for children Video games * Blocked (video game), a puzzle game for the iPhone and iPod Touc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Block Instruments-9
Block or blocked may refer to: Arts, entertainment and media Broadcasting * Block programming, the result of a programming strategy in broadcasting * W242BX, a radio station licensed to Greenville, South Carolina, United States known as ''96.3 the Block '' * WFNZ-FM, a radio station licensed to Harrisburg, North Carolina, United States, branded as ''92.7 The Block'' * "Blocked", an episode of the television series ''The Flash'' Music * Block Entertainment, a record label * Blocks Recording Club, a record label * Woodblock (instrument), a small piece of slit drum made from one piece of wood and used as a percussion instrument * "Blocks", by C418 from ''Minecraft – Volume Beta'', 2013 Toys * Toy block, one of a set of wooden or plastic pieces, of various shapes * Unit block, a type of standardized wooden toy block for children Video games * Blocked (video game), a puzzle game for the iPhone and iPod Touch Building and construction * Concrete block, cinder block or cement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Fothergill Cooke
Sir William Fothergill Cooke (4 May 1806 – 25 June 1879) was an English inventor. He was, with Charles Wheatstone, the co-inventor of the Cooke-Wheatstone electrical telegraph, which was patented in May 1837. Together with John Ricardo he founded the Electric Telegraph Company, the world's first public telegraph company, in 1846. He was knighted in 1869. Life He was born at Ealing, Middlesex; his father, William Cooke, was a surgeon there, and later was appointed professor of anatomy at the University of Durham. He was educated at Durham School and at the University of Edinburgh, and at the age of 20 entered the Indian Army. After five years' service in India Cooke returned home; then studied medicine in Paris, and at Heidelberg under Georg Wilhelm Munke. In 1836 he saw electric telegraphy, then only experimental: Munke had illustrated his lectures with a telegraphic apparatus on the principle introduced by Pavel Schilling in 1835. Cooke decided to put the invention i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Midland Railway
The North Midland Railway was a railway line and Great Britain, British railway company, which opened a line from the city of Derby in Derbyshire to the city of Leeds in Yorkshire in 1840. At Derby, it connected with the Birmingham and Derby Junction Railway and the Midland Counties Railway at what became known as the Derby Midland railway station, Tri-Junct Station. In 1844, the three companies merged to form the Midland Railway. Origin The East Midlands had for some years been at the centre of Derby Midland railway station#History, plans to link the major cities throughout the country. In Yorkshire, George Hudson was the Chairman of the York and North Midland Railway, a proposed line from York towards the industrial markets of Manchester and Liverpool. The new line would connect it, and the Manchester and Leeds Railway as part of a trunk route from the South and London to Yorkshire and the North East of England. Meanwhile, financiers in Birmingham, were looking to expand the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay Cross Tunnel
Clay Cross Tunnel is a tunnel on the Midland Main Line line near Clay Cross in Derbyshire, England. It was the most substantial single civil engineering feature present on the North Midland Railway and was one of the more ambitious railway tunnels to be built during the early development of Britain's railway network. Built to a design produced by the pioneering railway engineers George Stephenson and Robert Stephenson, the tunnel was constructed between February 1837 and August 1839 at a total cost of £105,460. Mid-way through the tunnel's excavation, the alignment had to be changed due to previously undiscovered seams of coal as well as iron ore; their presence led to the creation of a neighbouring colliery and iron works by George Stephenson. Many elements of the tunnel, such as the Grade II listed portals, have remained unaltered since their completion. Construction During the late 1830s, construction of the North Midland Railway was underway. Seeking to avoid steep gradie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooke And Wheatstone Telegraph
The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone. It was a form of needle telegraph, and the first telegraph system to be put into commercial service. The receiver consisted of a number of needles that could be moved by electromagnetic coils to point to letters on a board. This feature was liked by early users who were unwilling to learn codes, and employers who did not want to invest in staff training. In later systems, the letter board was dispensed with, and the code was read directly from the movement of the needles. This occurred because the number of needles was reduced, leading to more complex codes. The change was motivated by the economic need to reduce the number of telegraph wires used, which was related to the number of needles. The change became more urgent as the insulation of some of the early installations deteriorat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2012 Summer Olympics
The 2012 Summer Olympics, officially the Games of the XXX Olympiad and also known as London 2012, were an international multi-sport event held from 27 July to 12 August 2012 in London, England, United Kingdom. The first event, the group stage in Football at the 2012 Summer Olympics – Women's tournament, women's football, began on 25 July at the Millennium Stadium in Cardiff, Wales, followed by the opening ceremony on 27 July. There were 10,518 athletes from 206 National Olympic Committees (NOCs) who participated in the 2012 Olympics. Following a bid headed by former Olympic champion Sebastian Coe and the then-Mayor of London, London mayor Ken Livingstone, London was selected as the host city at the 117th IOC Session in Singapore on 6 July 2005, defeating bids from Moscow, New York City, Madrid, and Paris. London became the first city to host the modern Olympics three times, having previously hosted the Summer Games in 1908 Summer Olympics, 190 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Underground
The London Underground (also known simply as the Underground or as the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England. The Underground has its origins in the Metropolitan Railway, opening on 10 January 1863 as the world's first underground passenger railway. The Metropolitan is now part of the Circle line (London Underground), Circle, District line, District, Hammersmith & City line, Hammersmith & City and Metropolitan lines. The first line to operate underground electric locomotive, electric traction trains, the City & South London Railway in 1890, is now part of the Northern line. The network has expanded to 11 lines with of track. However, the Underground does not cover most southern parts of Greater London; there are only 33 Underground stations south of the River Thames. The system's List of London Underground stations, 272 stations collectively accommodate up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Line
The Northern line is a London Underground line that runs between North London and South London. It is printed in black on the Tube map. It carries more passengers per year than any other Underground linearound 340million in 2019making it the busiest tube line in London. The Northern line is unique on the network in having two different routes through Central London, two northern branches and two southern branches. Despite its name, it does not serve the northernmost stations on the Underground, though it does serve the southernmost station at Morden tube station, Morden, the terminus of one of the two southern branches. The line's northern termini, all in the London Borough of Barnet, are at and ; is the terminus of a single-station branch line off the High Barnet branch. The two main northern branches run south to join at where two routes, one via in the West End of London, West End and the other via in the City of London, City, continue and then join at in London Boroug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jubilee Line
The Jubilee line is a London Underground line that runs between in suburban north-west London and in east London, via the West End of London, West End, South Bank and London Docklands, Docklands. Opened in 1979, it is the newest line on the Underground network, although some sections of track date back to 1932 and some stations to 1879. The western section of the line between and was previously a branch of the Metropolitan line until 1939 and later a branch of the Bakerloo line until 1979, while the newly built line was completed in two major sections: initially in 1979 to , then in 1999 with Jubilee Line Extension, an extension to Stratford. The later stations are larger and have special Jubilee Line Extension#Design, safety features, both aspects being attempts to Future proofing, future-proof the line. Following the extension to east London, serving areas once poorly connected to the Underground, the line has seen a huge growth in passenger numbers and is the fourth-busi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Global Positioning System
The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta 31. It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. It does not require the user to transmit any data, and operates independently of any telephone or Internet reception, though these technologies can enhance the usefulness of the GPS positioning information. It provides critical positioning capabilities to military, civil, and commercial users around the world. Although the United States government created, controls, and maintains the GPS system, it is freely accessible to anyone with a GPS receiver. Overview The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was launched in 1978 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Inductance
Magnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other. Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism. The most familiar effects occur in ferromagnetic materials, which are strongly attracted by magnetic fields and can be magnetized to become permanent magnets, producing magnetic fields themselves. Demagnetizing a magnet is also possible. Only a few substances are ferromagnetic; the most common ones are iron, cobalt, nickel, and their alloys. All substances exhibit some type of magnetism. Magnetic materials are classified according to their bulk susceptibility. Ferromagnetism is responsible for most of the effects of magnetism encountered in everyday life, but there are actually several types of magnetism. Paramagnetic substances, such as aluminium and oxygen, are weakly attracted to an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
