Telegraphy Wikipedia

Telegraphy - Wikipedia.

Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of ....

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Wireless telegraphy - Wikipedia.

Wireless telegraphy or radiotelegraphy, commonly called CW (continuous wave), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method.It was transmitted by several different modulation methods during its history. The primitive spark-gap ....

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List of Nikola Tesla patents - Wikipedia.

Nikola Tesla was an inventor who obtained around 300 patents worldwide for his inventions.Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives. There are a minimum of 278 patents issued to Tesla in 26 countries that have been accounted for. Many of Tesla's patents were in the United States, Britain, and Canada, ....

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History of radio - Wikipedia.

The idea of wireless communication predates the discovery of "radio" with experiments in "wireless telegraphy" via inductive and capacitive induction and transmission through the ground, water, and even train tracks from the 1830s on.James Clerk Maxwell showed in theoretical and mathematical form in 1864 that electromagnetic waves could propagate through free space..

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Invention of radio - Wikipedia.

Before the discovery of electromagnetic waves and the development of radio communication there were many wireless telegraph systems proposed and tested. In April 1872 William Henry Ward received U.S. Patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. A few months after Ward ....

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Samuel Morse - Wikipedia.

Samuel Finley Breese Morse (April 27, 1791 - April 2, 1872) was an American inventor and painter. After having established his reputation as a portrait painter, in his middle age Morse contributed to the invention of a single-wire telegraph system based on European telegraphs. He was a co-developer of Morse code and helped to develop the commercial use of telegraphy..

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Baudot code - Wikipedia.

The Baudot code is an early character encoding for telegraphy invented by Emile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use until the advent of ASCII.Each character in the alphabet is represented by a series of five bits, sent over a communication channel such as a telegraph wire ....

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Pirate radio - Wikipedia.

In Europe, in addition to adopting the term free radio, supportive listeners of what had been called pirate radio adopted the term 'offshore radio, which was usually the term used by the owners of the marine broadcasting stations.. More recently the term "free radio" implied that the broadcasts were commercial-free and the station was there only for the output, be it a type of music or ....

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Telegrafie – Wikipedia.

Formen der Telegrafie. Es bestehen verschiedene Formen der Telegrafie. Die alteste ist die optische, bei der die Codes von Menschen noch manuell erzeugt und ausgewertet wurden.Besondere Telegrafen waren fruher neben dem optischen Telegrafen (auch Semaphor genannt) die Feuer-, Feld-, Eisenbahn-, Haus- und Schiffstelegrafen. Bei der jungeren, der ....

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History of electronic engineering - Wikipedia.

Some of the devices which would enable wireless telegraphy were invented before 1900. These include the spark-gap transmitter and the coherer with early demonstrations and published findings by David Edward Hughes (1880) and Heinrich Rudolf Hertz (1887 to 1890) and further additions to the field by Edouard Branly, Nikola Tesla, Oliver Lodge, Jagadish Chandra Bose, and Ferdinand ....

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Télégraphie sans fil — Wikipédia.

La telegraphie sans fil, egalement appelee TSF et radiotelegraphie permet d'ecrire a distance en utilisant des ondes electromagnetiques (sans fil telegraphique).Pour transmettre des messages, la telegraphie sans fil utilise l'alphabet Morse, dans lequel les lettres sont representees par des combinaisons de signaux longs ou traits et de signaux courts ou points. A l'aide d'un ....

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Battle of Tsushima - Wikipedia.

The Battle of Tsushima (Japanese:?????, Tsushimaoki-Kaisen, Russian: ????????? ????????, Tsusimskoye srazheniye), also known as the Battle of Tsushima Strait and the Naval Battle of Sea of Japan (Japanese: ?????, Nihonkai-Kaisen) in Japan, was a major naval battle fought between Russia and Japan during the Russo-Japanese War..

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Disruptive innovation - Wikipedia.

In business theory, disruptive innovation is innovation that creates a new market and value network or enters at the bottom of an existing market and eventually displaces established market-leading firms, products, and alliances. The concept was developed by the American academic Clayton Christensen and his collaborators beginning in 1995, and has been called the most ....

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Pigeon post - Wikipedia.

The pigeon post that was in operation while Paris was besieged during the Franco-Prussian War of 1870-1871 is probably the most famous. Barely six weeks after the outbreak of hostilities, the Emperor Napoleon III and the French Army of Chalons surrendered at Sedan on 2 September 1870. There were two immediate consequences: the fall of the Second Empire and the swift Prussian ....

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Prosigns for Morse code - Wikipedia.

Procedural signs or prosigns are shorthand signals used in Morse code radio telegraphy procedure, for the purpose of simplifying and standardizing radio communication protocol. They are separate from Morse code abbreviations, which consist mainly of brevity codes that convey messages to other parties with greater speed and accuracy.. In general prosigns are just standardised parts of ....

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Submarine communications cable - Wikipedia.

A submarine communications cable is a cable laid on the sea bed between land-based stations to carry telecommunication signals across stretches of ocean and sea. The first submarine communications cables laid beginning in the 1850s carried telegraphy traffic, establishing the first instant telecommunications links between continents, such as the first transatlantic telegraph ....

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telegraph | Invention, History, & Facts | Britannica.

telegraph, any device or system that allows the transmission of information by coded signal over distance. Many telegraphic systems have been used over the centuries, but the term is most often understood to refer to the electric telegraph, which was developed in the mid-19th century and for more than 100 years was the principal means of transmitting printed information by wire or radio ....

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Electrical telegraph - Wikipedia.

An electrical telegraph was a point-to-point text messaging system, used from the 1840s until the late 20th century when it was slowly replaced by other telecommunication systems. At the sending station switches connected a source of current to the telegraph wires. At the receiving station the current activated electromagnets which moved indicators, providing either a visual or audible ....

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Code (disambiguation) - Wikipedia.

Baudot code, used in telegraphy; Diagnosis code, used to translate medical conditions into statistical codes, also used for the purpose of health care planning and reimbursement; Encoding (memory), storage and recalling of information by organisms; Genetic code, a correspondence between the structures of messenger RNA and proteins.

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Company rule in India - Wikipedia.

Company rule in India (sometimes, Company Raj, from Hindi: raj, lit. 'rule') refers to the rule of the British East India Company on the Indian subcontinent.This is variously taken to have commenced in 1757, after the Battle of Plassey, when the Nawab of Bengal surrendered his dominions to the Company; in 1765, when the Company was granted the diwani, or the right to collect revenue, in ....

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Elizabeth, New Jersey - Wikipedia.

Elizabeth, originally called "Elizabethtown" and part of the Elizabethtown Tract, was founded in 1664 by English settlers.The town was not named for Queen Elizabeth I as many people may assume, but rather for Elizabeth, wife of Sir George Carteret, one of the two original Proprietors of the colony of New Jersey. She was the daughter of Philippe de Carteret II, 3rd Seigneur de Sark ....

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GN Store Nord - Wikipedia.

The starting point of The Great Northern Telegraph Company (now GN Store Nord) was a concession agreement, which C.F. Tietgen made with the Russian Tzar in 1869. The agreement gave The Great Northern Telegraph Company exclusive rights - and obligations - to establish and run a telegraph line in Russia..

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