"Semaphore South, Glanville, Exeter and Largs Bay. 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"
"Semaphore telegraph A semaphore telegraph is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. The most widely used system was invented in 1792 in France by Claude Chappe, and was popular in the late eighteenth to early nineteenth centuries. Lines of relay towers with a semaphore rig at the top were built within line-of-sight of each other, at separations of 5 to 20 miles. Operators at"
"in various applications. A 'semaphore telegraph', also called a 'semaphore line', 'optical telegraph', 'shutter telegraph chain', 'Chappe telegraph', or 'Napoleonic semaphore', is a system used for conveying information by means of visual signals, using towers with pivoting arms or shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. Semaphore lines were a precursor of the electrical telegraph. They were far faster than post riders for conveying a message over long distances, but far more expensive and less private than the electrical"
"are more visible). In Spain, the engineer Agustín de Betancourt developed his own system which was adopted by that state. This system was considered by many experts in Europe better than Chappe's, even in France. These systems were popular in the late 18th to early 19th century but could not compete with the electrical telegraph, and went completely out of service by 1880. Semaphore Flags is the system for 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,"
"Telegraphy Telegraphy (from Ancient Greek: τῆλε, ""têle"", ""at a distance"" and γράφειν, ""gráphein"", ""to write"") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not. Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Many methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples. In the"
"first to employ homing pigeons as messengers in any large and organized manner, and also the first to use observation balloons for reconnaissance and communications. But the real advance for conveying long range dispatches came in the form of an ingenious optical Telegraph Semaphore system invented by Claude Chappe. Chappe's system comprised an intricate network of small towers, within visual range of one another. On top of each was a 9-metre mast, with three large, movable wooden rods mounted on them. These rods, called the ""régulateur"" (regulator), were operated by trained crews using a series of pulleys and levers. The"
"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. 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. Semaphore supports the following programming languages: C/C++, Clojure,"
"marches in and brings the flags for the flag-hoisting ceremony. Flag-hoisting ceremonies involving flag-raising squads can be simple or elaborate, involving large numbers of squads. Elaborate flag-hoisting ceremonies are usually performed on national holidays. Semaphore is a form of communication that utilizes flags. The signalling is performed by an individual using two flags (or lighted wands), the positions of the flags indicating a symbol. The person who holds the flags is known as the signalman. This form of communication is primarily used by naval signallers. This technique of signalling was adopted in the early 19th century and is still used"
"include the word ""telegraph"" due to their having received news by means of electric telegraphy. Some of these names are retained even though more sophisticated means are now used. A newspaper in Indian state of Tamil Nadu is named as Dhina Thanthi which means daily telegraph. Telegraphy Telegraphy (from Ancient Greek: τῆλε, ""têle"", ""at a distance"" and γράφειν, ""gráphein"", ""to write"") is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not. Telegraphy requires"
"via the clacks is also mentioned. In David Weber's ""Safehold"" series (2007), a worldwide semaphore system is used by the Church to help them maintain their dominion over the world. In Alastair Reynolds' ""Terminal World"" (2010), the distant-future terrain is criss-crossed with semaphore lines relaying information between the one remaining city, Spearpoint, outlying communities and the airborne community Swarm. Semaphore telegraph A semaphore telegraph is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when"
"Semaphoric telegraphs"", referring to the destruction of telegraphs in France. The word ""semaphore"" was first printed in English in 1816: ""The improved Semaphore has been erected on the top of the Admiralty"", referring to the installation of a simpler telegraph invented by Sir Home Popham. Semaphore telegraphs are also called ""optical telegraphs"", ""shutter telegraph chains"", ""Chappe telegraphs"" or ""Napoleonic semaphore"". Optical telegraphy dates from ancient times, in the form of hydraulic telegraphs, torches (as used by ancient cultures since the discovery of fire) and smoke signals. Modern design of semaphores was first foreseen by the British polymath Robert Hooke, who"
"19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging. The word ""telegraph"" was first coined by the French inventor of the Semaphore telegraph, Claude Chappe, who also coined the word ""semaphore"". A ""telegraph"" is a device for transmitting and receiving messages over long distances, i.e., for"
"code until the test is green. 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. 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. Semaphore supports"
"Semaphore (programming) In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system. A semaphore is simply a variable. This variable is used to solve critical section problems and to achieve process synchronization in the multi processing environment. 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 the real-world system is as a record of"
"each tower would watch the neighboring tower through a spyglass, and when the semaphore arms began to move spelling out a message, they would pass the message on to the next tower. This system was much faster than post riders for conveying a message over long distances, and also had cheaper long-term operating costs, once constructed. Semaphore lines were a precursor of the electrical telegraph, which would replace them half a century later, and would also be cheaper, faster, and more private. The line-of-sight distance between relay stations was limited by geography and weather, and prevented the optical telegraph from"
"Pulse-position modulation Pulse-position modulation (PPM) is a form of signal modulation in which ""M"" message bits are encoded by transmitting a single pulse in one of formula_1 possible required time shifts. This is repeated every ""T"" seconds, such that the transmitted bit rate is formula_2 bits per second. It is primarily useful for optical communications systems, which tend to have little or no multipath interference. An ancient use of pulse-position modulation was the Greek hydraulic semaphore system invented by Aeneas Stymphalus around 350 B.C. that used the water clock principle to time signals. In this system, the draining of water"
"The use of seismic communication is found in many taxa, including frogs, kangaroo rats, mole rats, bees, nematode worms, and others. Tetrapods usually make seismic waves by drumming on the ground with a body part, a signal that is sensed by the sacculus of the receiver. The sacculus is an organ in the inner ear containing a membranous sac that is used for balance, but can also detect seismic waves in animals that use this form of communication. Vibrations may be combined with other sorts of communication. A number of different snakes have the ability to sense infrared (IR) thermal"
"inspired by one of its descendants. The history of telecommunication - the transmission of signals over a distance for the purpose of communication - began thousands of years ago with the use of smoke signals and drums in Africa, America and parts of Asia. In the 1790s the first fixed semaphore systems emerged in Europe however it was not until the 1830s that electrical [telecommunication] systems started to appear. History of communication Since prehistoric times, significant changes in communication technologies (media and appropriate inscription tools) have evolved in tandem with shifts in political and economic systems, and by extension, systems"
"Semiochemical A semiochemical, from the Greek σημεῖον (""semeion"") meaning ""signal"", is a chemical substance or mixture that carries a message for purpose of communication. Semiochemical communication can be divided into two broad classes: communication between individuals of the same species (intraspecific) or communication between different species (interspecific). It is usually used in the field of chemical ecology to encompass pheromones, allomones, kairomones, attractants and repellents. Many insects, including parasitic insects, use semiochemicals, which are natural chemicals released by an organism that affect the behaviors of other individuals. Pheromones are intraspecific signals that aid in finding mates, food and habitat resources,"
"used to implement locks. The semaphore concept was invented by Dutch computer scientist Edsger Dijkstra in 1962 or 1963, when Dijkstra and his team were developing an operating system for the Electrologica X8. That system eventually became known as THE multiprogramming system. Suppose a library has 10 identical study rooms, to be used by one student at a time. Students must request a room from the front desk if they wish to use a study room. If no rooms are free, students wait at the desk until someone relinquishes a room. When a student has finished using a room, the"
"pest control are Semiochemical A semiochemical, from the Greek σημεῖον (""semeion"") meaning ""signal"", is a chemical substance or mixture that carries a message for purpose of communication. Semiochemical communication can be divided into two broad classes: communication between individuals of the same species (intraspecific) or communication between different species (interspecific). It is usually used in the field of chemical ecology to encompass pheromones, allomones, kairomones, attractants and repellents. Many insects, including parasitic insects, use semiochemicals, which are natural chemicals released by an organism that affect the behaviors of other individuals. Pheromones are intraspecific signals that aid in finding mates, food"
"Pheromone-based communication is one of the most effective ways of communication which is widely observed in nature. Pheromone is used by social insects such as bees, ants and termites; both for inter-agent and agent-swarm communications. Due to its feasibility; artificial pheromones have been adopted in multi-robot and swarm robotic systems. Pheromone-based communication was implemented by different means such as chemical or physical (RFID tags, light, sound) ways. However, those implementations were not able to replicate all the aspects of pheromones as seen in nature. Using projected light was presented in is an experimental setup to study on pheromone-based communication with"
"Telepathy Telepathy (from the Greek τῆλε, ""tele"" meaning ""distant"" and πάθος, ""pathos"" or ""-patheia"" meaning ""feeling, perception, passion, affliction, experience"") is the purported transmission of information from one person to another without using any known human sensory channels or physical interaction. The term was coined in 1882 by the classical scholar Frederic W. H. Myers, a founder of the Society for Psychical Research, and has remained more popular than the earlier expression ""thought-transference"". Telepathy experiments have historically been criticized for lack of proper controls and repeatability. There is no convincing evidence that telepathy exists, and the topic is generally considered"
"Railway semaphore signal Semaphore is of the earliest forms of fixed railway signals. These signals 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 few they remain in use. The first railway semaphore signal was erected by Charles Hutton Gregory on the London and Croydon Railway (later the London"
"activity of a cell. A semiochemical is a message-carrying chemical that is meant to attract, repel, and convey information. Types of semiochemicals include pheromones and kairomones. One example is the butterfly ""Phengaris arion ""which uses chemical signals as a form of mimicry to aid in predation. In addition to the use of sound for communication, a wide range of insects have evolved chemical means for communication. These chemicals, termed semiochemicals, are often derived from plant metabolites include those meant to attract, repel and provide other kinds of information. Pheromones, a type of semiochemical, are used for attracting mates of the"
"system to warn of invasion. To make it practical, he also invents the telescope. ""Pavane"" (1968), an alternate history novel by Keith Roberts, features a society where long distance communication is by a network of semaphores operated by the powerful Guild of Signallers. Terry Pratchett's Discworld novels (from ""The Fifth Elephant"", 1999, onwards) describe a system of eight-shutter semaphore towers, known as Clacks, which occupy a similar role to that of the Internet. Using advanced clack coding, it is possible not only to send very fast telegrams, but also to encode pictures and send them long-distance, and shopping and banking"
"use-case, in that only the thread that locked the mutex is supposed to unlock it. This constraint makes it possible to implement some additional features in mutexes: Semaphore (programming) In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system. A semaphore is simply a variable. This variable is used to solve critical section problems and to achieve process synchronization in the multi processing environment. A trivial semaphore is a plain variable that is changed (for example, incremented"
"series. Interference with the French semaphore system is also an important plot element in ""Ramage's Signal"" by Dudley Pope. In the young adult fiction book ""Death Cloud"" by Andy Lane (2010), Mycroft Holmes tells 14-year-old Sherlock Holmes about semaphore stations, commenting about his school beforehand, saying ""All the Latin a boy can cram into his skull, but nothing of practical use."" Fictional versions of the telegraph also appear in literature. In the alternative history novel, ""Lest Darkness Fall"" (1939), by L. Sprague de Camp, the protagonist, a twentieth century man who time travels into Dark Age Rome, develops a semaphore"
"Telepathy (software) Telepathy is a software framework which can be used to make software for interpersonal communications such as instant messaging, Voice over IP or videoconferencing. Telepathy enables the creation of communications applications using components via the D-Bus inter-process communication mechanism. Through this it aims to simplify development of communications applications and promote code reuse within the free software and open source communities by defining a logical boundary between the applications and underlying network protocols. There are free software implementations of various protocols that export Telepathy interfaces: Mission Control is the name of the component that provides a way for"
"semiotic, hermeneutic, and social dimensions of their contexts. Statistics, as a quantitative approach to communication science, has also been incorporated into research on communication science in order to help substantiate claims. Communication Communication (from Latin ""commūnicāre"", meaning ""to share"") is the act of conveying meanings from one entity or group to another through the use of mutually understood signs, symbols, and semiotic rules. The main steps inherent to all communication are: The scientific study of communication can be divided into: The channel of communication can be visual, auditory, tactile (such as in Braille) and haptic, olfactory, electromagnetic, or biochemical. Human"
"to interpret them in the way that humans do. Everything has meaning. True communication, including the use of human language, however, requires someone (a ""sender"") who sends a ""message"", or ""text"", in some code to someone else (a ""receiver""). Language is studied only insofar as it is one of these forms (the most sophisticated form) of communication. Some important figures in the history of semiotics, are Charles Sanders Peirce, Roland Barthes, and Roman Jakobson. In modern times, its best-known figures include Umberto Eco, A.J. Greimas, Louis Hjelmslev, and Tullio De Mauro. Investigations on signs in non-human communications are subject to"
"Free-space optical communication Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. ""Free space"" means air, outer space, vacuum, or something similar. This contrasts with using solids such as optical fiber cable. The technology is useful where the physical connections are impractical due to high costs or other considerations. Optical communications, in various forms, have been used for thousands of years. The Ancient Greeks used a coded alphabetic system of signalling with torches developed by Cleoxenus, Democleitus and Polybius. In the modern era, semaphores"
"only pass a single bit of information, so the meaning of the message such as ""the enemy has been sighted"" had to be agreed upon in advance. One notable instance of their use was during the Spanish Armada, when a beacon chain relayed a signal from Plymouth to London. In 1792, Claude Chappe, a French engineer, built the first fixed visual telegraphy system (or semaphore line) between Lille and Paris. However semaphore suffered from the need for skilled operators and expensive towers at intervals of ten to thirty kilometres (six to nineteen miles). As a result of competition from the"