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Semaphore (other)
Semaphore is the use of an apparatus with telegraphy to create a visual signal transmitted over long-distances. It may refer specifically to: * Flag semaphore * Semaphore telegraph, a system of long-distance communication based on towers with moving arms * Railway semaphore signal for railway traffic control * Traffic semaphore, another name for automotive traffic lights based on their early resemblance to railway semaphores * Turning semaphore or trafficators, retractable arms to indicate turns on automobiles from the 1920s to 1950s Other * Semaphore (programming), in computer science, a mechanism for supporting mutual exclusion in concurrent programs * Semaphore (software), a continuous integration testing utility * Semaphore, South Australia, a historic seaside suburb of Adelaide * Semaphore railway line, Adelaide, a closed railway line in South Australia * Semaphore Corporation (company), a software and publishing firm that operated from 1982 to 2017 * ''Semaphore'' (albu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore
Semaphore (; ) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when arranged in visually connected networks, or for traffic signalling such as in railway systems, or traffic lights in cities. Fire The Phryctoriae were a semaphore system used in Ancient Greece for the transmission of specific prearranged messages. Towers were built on selected mountaintops, so that one tower, the ''phryctoria'', would be visible to the next tower, usually twenty-miles distant. Flames were lit on one tower, then the next tower would light a flame in succession. The Byzantine beacon system was a semaphore developed in the 9th century during the Arab–Byzantine wars. The Byzantine Empire used a system of beacons to transmit messages from the border with the Abbasid Caliphate across Asia Minor to the Byzantine capital, Const ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Semaphore
Flag semaphore (from the Ancient Greek () 'sign' and - (-) '-bearer') is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used (with hand-held flags replacing the mechanical arms of shutter semaphores) in the maritime world in the 19th century. It is still used during underway replenishment at sea and is acceptable for emergency communication in daylight or using lighted wands instead of flags, at night. Contemporary semaphore flag system The current flag semaphore system uses two short poles with square flags, which a signal person holds in different positions to signal letters of the alphabet and numbers. The signaller holds one pole in each hand, and extends each arm in one of eight possible directions. Except for in the re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore Telegraph
Semaphore (; ) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when arranged in visually connected networks, or for traffic signalling such as in railway systems, or traffic lights in cities. Fire The Phryctoriae were a semaphore system used in Ancient Greece for the transmission of specific prearranged messages. Towers were built on selected mountaintops, so that one tower, the ''phryctoria'', would be visible to the next tower, usually twenty-miles distant. Flames were lit on one tower, then the next tower would light a flame in succession. The Byzantine beacon system was a semaphore developed in the 9th century during the Arab–Byzantine wars. The Byzantine Empire used a system of beacons to transmit messages from the border with the Abbasid Caliphate across Asia Minor to the Byzantine capital, Const ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Semaphore Signal
Railway semaphore signal is one of the earliest forms of fixed railway signals. This semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'. Semaphore signals were patented in the early 1840s by Joseph James Stevens, and soon became the most widely used form of mechanical signal. Designs have altered over the intervening years, and colour light signals have replaced semaphore signals in most countries, but in a few they remain in use. Origins The first railway semaphore signal was erected by Charles Hutton Gregory on the London and Croydon Railway (later the London Brighton and South Coast Railway) at New Cross, southeast London, about 1842 on the newly enlarged layout also accommodating the South Eastern Railway. John Urpeth Rastrick claimed to have suggested the idea to Hutton Gregory. The semaphore was afterwards rapidly adopted as fixed manual signals throughout Britain and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traffic Semaphore
Traffic lights, traffic signals, or stoplights – known also as robots in South Africa are signalling devices positioned at road intersections, pedestrian crossings, and other locations in order to control flows of traffic. Traffic lights consist normally of three signals, transmitting meaningful information to drivers and riders through colours and symbols including arrows and bicycles. The regular traffic light colours are red, yellow, and green arranged vertically or horizontally in that order. Although this is internationally standardised,1968, as revised 1995 and 2006Vienna Convention on Road Signs and Signals United Nations Publication ECE/TRANS/196. ISBN 978-92-1-116973-7. URL Accessed: 7 January 2022. variations exist on national and local scales as to traffic light sequences and laws. The method was first introduced in December 1868 on Parliament Square in London to reduce the need for police officers to control traffic. Since then, electricity and computerised co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turning Semaphore
Trafficators are semaphore signals which, when operated, protrude from the bodywork of a motor vehicle to indicate its intention to turn in the direction indicated by the pointing signal. Trafficators are often located at the door pillar. History They first appeared in the 1900s, when they were actuated either mechanically or pneumatically. In 1908, Alfredo Barrachini in Rome added electric lights inside the arms that turned on as they extended, but operation was still by a cable system. Electric operation came in 1918 when the Naillik Motor Signal Company of Boston added electric motor drive. This system was superseded by two French inventors, Gustave Deneef and Maurice Boisson, who used a linear solenoid in 1923. The final complete system came in 1927 when Berlin-based Max Ruhl and Ernst Neuman combined internal illumination and solenoid operation: (but see Gladstone Adams). The shape of the trafficator arm is closely based upon the shape of the semaphore signal arm used b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore (programming)
In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple threads and avoid critical section problems in a concurrent system such as a multitasking operating system. Semaphores are a type of synchronization primitive. A trivial semaphore is a plain variable that is changed (for example, incremented or decremented, or toggled) depending on programmer-defined conditions. A useful way to think of a semaphore as used in a real-world system is as a record of how many units of a particular resource are available, coupled with operations to adjust that record ''safely'' (i.e., to avoid race conditions) as units are acquired or become free, and, if necessary, wait until a unit of the resource becomes available. Semaphores are a useful tool in the prevention of race conditions; however, their use is not a guarantee that a program is free from these problems. Semaphores which allow an arbitrary resource count are calle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore (software)
Semaphore is a hosted continuous integration and deployment service used for testing and deploying software projects hosted on GitHub and BitBucket. While open source projects can use Semaphore for free in its full capacity, free use for private projects is limited to 100 builds per month (Semaphore Classic) or $20 of service every month (Semaphore 2.0). One of Semaphore’s features is native Docker support, which enables testing and deploying Docker-based applications. Semaphore also offers Boosters, a feature that reduces the duration of running a test suite to that of the longest test through automatic parallelization of builds for Ruby projects. Features Semaphore supports the following programming languages: C/ C++, Clojure, Elixir, Go, Java, JavaScript, PHP, Python, Ruby and Scala. Projects written in other programming languages demand manual configuration. Some of the supported frameworks include: test/unit, RSpec, Cucumber, Steak, Capybara Webkit, Jasmine, Karma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore, South Australia
Semaphore is a northwestern suburb of Adelaide in the Australian state of South Australia. It is located on the Gulf St Vincent coastline of the Lefevre Peninsula about from the Adelaide city centre. History Semaphore was first surveyed for sale in 1849, at which time it was isolated by swamps to the south and the Port River to the east. In 1851, George Coppin, a prominent publican, theatrical entrepreneur and actor, built a two-storeyed timber hotel on the southern corner of The Esplanade and Blackler Street. A very high flagpole was erected to signal to his "White Horse Cellars" hotel at Port Adelaide the approach of ships, earning the area the name Semaphore, often called "The Semaphore". In 1856, an official government signal station was established at the intersection of The Esplanade and Semaphore Road, where officers would record the details of all vessels in Gulf St Vincent. It was also used to record information on water depth, tides and cargo loading. A Telegraph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore Railway Line, Adelaide
Semaphore railway line was a railway line in the Australian state of South Australia located in the north-west of Adelaide servicing the suburbs of Semaphore and Exeter. It had two stations: Semaphore and Exeter. The line opened in 1878 and closed in 1978. History The Semaphore line was extended from Port Adelaide by South Australian Railways on 7 January 1878 with no intermediate stations. It was to serve both the new overseas shipping jetty at Semaphore, and for defence logistics along Military Road (in support of nearby Fort Largs and Fort Glanville). It remained the main line until the Outer Harbor railway line was extended north from a junction created at Glanville in 1908. In 1917 when the Semaphore to Rosewater and Albert Park tram line was opened there was an unresolved dispute over the tramline crossing the railway line near Exeter station. The Railway Commissioner disallowed trams to cross over the railway line. Trams continued to operate with one isolated tram se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore Corporation (company)
Semaphore Corporation was a company notable for being the first to provide public access to selected U.S. Postal Service databases, and for its early computer publications in the 1980s. Founded in January 1982, the company operated for 35 years through September 2017. The firm's initial products were for Pick operating system programmers and users, followed by offerings for Lisa and Macintosh users, then finally concentrating solely on the Windows market. Software, services, and periodicals by Semaphore ADOsort was a Windows program for sorting and printing postal mail to allow qualifying for first and third class mail postage discounts. Originally bundled with a $19 companion database for ZP4 in 2005, ADOsort became a free downloadable program along with a number of other tools in 2016. Complete source code was released in 2017, and is still downloadable with the MAF installer. ADOsort includes editable data tables and a postal form editor, making it notable as a program that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semaphore (album)
''Semaphore'' is the second studio album by Fridge, released in March 1998. Critical reception ''NME'' wrote: "Fridge have created an album that is deceptive; minimal and monotonous, you coast through a series of seemingly pointless guitar-bass-and-drums instrumentals like 'Teletexed' and 'Chroma' before being softened up for the nerve-rattling sax on the Faust-like 'Low Fat Diet', or the sand-in-your-joints noise of 'Stamper'." ''The Independent ''The Independent'' is a British online newspaper. It was established in 1986 as a national morning printed paper. Nicknamed the ''Indy'', it began as a broadsheet and changed to tabloid format in 2003. The last printed edition was publis ...'' thought that "although there is much rhythmic intrigue here, sometimes the impression is left that the knobs and buttons on synthesizers dictate the melodies." Track listing # "Cassette" (1:23) # "Furniture Boy" (7:09) # "A Slow" (4:13) # "Motorbus" (7:27) # "Teletexed" (4:06) # "Chrom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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