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1 телеграфная связь
1) Military: recorded communication, recorded communications, telegraphy communication, telegraphy communications2) Engineering: telegraph, telegraph communication, telegraph connection (соединение), telegraph line, telegraphic communication, telegraphic line, telegraphy3) Railway term: telegraph service4) Economy: cable communication5) Telecommunications: letter-printing communication -
2 Fessenden, Reginald Aubrey
[br]b. 6 October 1866 East Bolton, Quebec, Canadad. 22 July 1932 Bermuda[br]Canadian radio pioneer who made the first known broadcast of speech and music.[br]After initial education at Trinity College School, Port Hope, Ontario, Fessenden studied at Bishops University, Lennoxville, Quebec. When he graduated in 1885, he became Principal of the Whitney Institute in Bermuda, but he left the following year to go to New York in pursuit of his scientific interests. There he met Edison and eventually became Chief Chemist at the latter's Laboratory in Orange, New Jersey. In 1890 he moved to the Westinghouse Electric and Manufacturing Company, and two years later he returned to an academic career as Professor of Electrical Engineering, initially at Purdue University, Lafayette, Indiana, and then at the Western University of Pennsylvania, where he worked on wireless communication. From 1900 to 1902 he carried out experiments in wireless telegraphy at the US Weather Bureau, filing several patents relating to wire and liquid thermal detectors, or barretters. Following this he set up the National Electric Signalling Company; under his direction, Alexanderson and other engineers at the General Electric Company developed a high-frequency alternator that enabled him to build the first radiotelephony transmitter at Brant Rock, Massachusetts. This made its initial broadcast of speech and music on 24 December 1906, received by ship's wireless operators several hundred miles away. Soon after this the transmitter was successfully used for two-way wireless telegraphy communication with Scotland. Following this landmark event, Fessenden produced numerous inventions, including a radio compass, an acoustic depth-finder and several submarine signalling devices, a turboelectric drive for battleships and, notably, in 1912 the heterodyne principle used in radio receivers to convert signals to a lower (intermediate) frequency.[br]Principal Honours and DistinctionsInstitute of Electrical and Electronics Engineers Medal of Honour 1921.BibliographyUS patents relating to barretters include nos. 706,740, 706,742 and 706,744 (wire, 1902) and 731,029 (liquid, 1903). His invention of the heterodyne was filed as US patent no. 1,050,441 (1913).Further ReadingHelen M.Fessenden, 1940, Fessenden. Builder of Tomorrow. E.Hawkes, 1927, Pioneers of Wireless, London: Methuen. O.E.Dunlop, 1944, Radio's 100 Men of Science.KFBiographical history of technology > Fessenden, Reginald Aubrey
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3 надтональная телеграфная связь
2) Engineering: superaudio telegraphyУниверсальный русско-английский словарь > надтональная телеграфная связь
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4 тональная телеграфная связь
2) Engineering: voice-frequency telegraphyУниверсальный русско-английский словарь > тональная телеграфная связь
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5 телеграфная связь
telegraphy, telegraphic communicationРусско-английский научно-технический словарь Масловского > телеграфная связь
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6 Preece, Sir William Henry
[br]b. 15 February 1834 Bryn Helen, Gwynedd, Walesd. 6 November 1913 Penrhos, Gwynedd, Wales[br]Welsh electrical engineer who greatly furthered the development and use of wireless telegraphy and the telephone in Britain, dominating British Post Office engineering during the last two decades of the nineteenth century.[br]After education at King's College, London, in 1852 Preece entered the office of Edwin Clark with the intention of becoming a civil engineer, but graduate studies at the Royal Institution under Faraday fired his enthusiasm for things electrical. His earliest work, as connected with telegraphy and in particular its application for securing the safe working of railways; in 1853 he obtained an appointment with the Electric and National Telegraph Company. In 1856 he became Superintendent of that company's southern district, but four years later he moved to telegraph work with the London and South West Railway. From 1858 to 1862 he was also Engineer to the Channel Islands Telegraph Company. When the various telegraph companies in Britain were transferred to the State in 1870, Preece became a Divisional Engineer in the General Post Office (GPO). Promotion followed in 1877, when he was appointed Chief Electrician to the Post Office. One of the first specimens of Bell's telephone was brought to England by Preece and exhibited at the British Association meeting in 1877. From 1892 to 1899 he served as Engineer-in-Chief to the Post Office. During this time he made a number of important contributions to telegraphy, including the use of water as part of telegraph circuits across the Solent (1882) and the Bristol Channel (1888). He also discovered the existence of inductive effects between parallel wires, and with Fleming showed that a current (thermionic) flowed between the hot filament and a cold conductor in an incandescent lamp.Preece was distinguished by his administrative ability, some scientific insight, considerable engineering intuition and immense energy. He held erroneous views about telephone transmission and, not accepting the work of Oliver Heaviside, made many errors when planning trunk circuits. Prior to the successful use of Hertzian waves for wireless communication Preece carried out experiments, often on a large scale, in attempts at wireless communication by inductive methods. These became of historic interest only when the work of Maxwell and Hertz was developed by Guglielmo Marconi. It is to Preece that credit should be given for encouraging Marconi in 1896 and collaborating with him in his early experimental work on radio telegraphy.While still employed by the Post Office, Preece contributed to the development of numerous early public electricity schemes, acting as Consultant and often supervising their construction. At Worcester he was responsible for Britain's largest nineteenth-century public hydro-electric station. He received a knighthood on his retirement in 1899, after which he continued his consulting practice in association with his two sons and Major Philip Cardew. Preece contributed some 136 papers and printed lectures to scientific journals, ninety-nine during the period 1877 to 1894.[br]Principal Honours and DistinctionsCB 1894. Knighted (KCB) 1899. FRS 1881. President, Society of Telegraph Engineers, 1880. President, Institution of Electrical Engineers 1880, 1893. President, Institution of Civil Engineers 1898–9. Chairman, Royal Society of Arts 1901–2.BibliographyPreece produced numerous papers on telegraphy and telephony that were presented as Royal Institution Lectures (see Royal Institution Library of Science, 1974) or as British Association reports.1862–3, "Railway telegraphs and the application of electricity to the signaling and working of trains", Proceedings of the ICE 22:167–93.Eleven editions of Telegraphy (with J.Sivewright), London, 1870, were published by 1895.1883, "Molecular radiation in incandescent lamps", Proceedings of the Physical Society 5: 283.1885. "Molecular shadows in incandescent lamps". Proceedings of the Physical Society 7: 178.1886. "Electric induction between wires and wires", British Association Report. 1889, with J.Maier, The Telephone.1894, "Electric signalling without wires", RSA Journal.1898, "Aetheric telegraphy", Proceedings of the Institution of Electrical Engineers.Further ReadingJ.J.Fahie, 1899, History of Wireless Telegraphy 1838–1899, Edinburgh: Blackwood. E.Hawkes, 1927, Pioneers of Wireless, London: Methuen.E.C.Baker, 1976, Sir William Preece, F.R.S. Victorian Engineer Extraordinary, London (a detailed biography with an appended list of his patents, principal lectures and publications).D.G.Tucker, 1981–2, "Sir William Preece (1834–1913)", Transactions of the Newcomen Society 53:119–36 (a critical review with a summary of his consultancies).GW / KFBiographical history of technology > Preece, Sir William Henry
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7 телеграфная связь
1. telegraphy, telegraph communicationсредство информации; средство связи — communication medium
2. telegraph connectionРусско-английский большой базовый словарь > телеграфная связь
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8 Marconi, Marchese Guglielmo
[br]b. 25 April 1874 Bologna, Italyd. 20 July 1937 Rome, Italy[br]Italian radio pioneer whose inventiveness and business skills made radio communication a practical proposition.[br]Marconi was educated in physics at Leghorn and at Bologna University. An avid experimenter, he worked in his parents' attic and, almost certainly aware of the recent work of Hertz and others, soon improved the performance of coherers and spark-gap transmitters. He also discovered for himself the use of earthing and of elevated metal plates as aerials. In 1895 he succeeded in transmitting telegraphy over a distance of 2 km (1¼ miles), but the Italian Telegraph authority rejected his invention, so in 1896 he moved to England, where he filed the first of many patents. There he gained the support of the Chief Engineer of the Post Office, and by the following year he had achieved communication across the Bristol Channel.The British Post Office was also slow to take up his work, so in 1897 he formed the Wireless Telegraph \& Signal Company to work independently. In 1898 he sold some equipment to the British Army for use in the Boer War and established the first permanent radio link from the Isle of Wight to the mainland. In 1899 he achieved communication across the English Channel (a distance of more than 31 miles or 50 km), the construction of a wireless station at Spezia, Italy, and the equipping of two US ships to report progress in the America's Cup yacht race, a venture that led to the formation of the American Marconi Company. In 1900 he won a contract from the British Admiralty to sell equipment and to train operators. Realizing that his business would be much more successful if he could offer his customers a complete radio-communication service (known today as a "turnkey" deal), he floated a new company, the Marconi International Marine Communications Company, while the old company became the Marconi Wireless Telegraph Company.His greatest achievement occurred on 12 December 1901, when Morse telegraph signals from a transmitter at Poldhu in Cornwall were received at St John's, Newfoundland, a distance of some 2,100 miles (3,400 km), with the use of an aerial flown by a kite. As a result of this, Marconi's business prospered and he became internationally famous, receiving many honours for his endeavours, including the Nobel Prize for Physics in 1909. In 1904, radio was first used to provide a daily bulletin at sea, and in 1907 a transatlantic wireless telegraphy service was inaugurated. The rescue of 1,650 passengers from the shipwreck of SS Republic in 1909 was the first of many occasions when wireless was instrumental in saving lives at sea, most notable being those from the Titanic on its maiden voyage in April 1912; more lives would have been saved had there been sufficient lifeboats. Marconi was one of those who subsequently pressed for greater safety at sea. In 1910 he demonstrated the reception of long (8 km or 5 miles) waves from Ireland in Buenos Aires, but after the First World War he began to develop the use of short waves, which were more effectively reflected by the ionosphere. By 1918 the first link between England and Australia had been established, and in 1924 he was awarded a Post Office contract for short-wave communication between England and the various parts of the British Empire.With his achievements by then recognized by the Italian Government, in 1915 he was appointed Radio-Communications Adviser to the Italian armed forces, and in 1919 he was an Italian delegate to the Paris Peace Conference. From 1921 he lived on his yacht, the Elettra, and although he joined the Fascist Party in 1923, he later had reservations about Mussolini.[br]Principal Honours and DistinctionsNobel Prize for Physics (jointly with K.F. Braun) 1909. Russian Order of S t Anne. Commander of St Maurice and St Lazarus. Grand Cross of the Order of the Crown (i.e. Knight) of Italy 1902. Freedom of Rome 1903. Honorary DSc Oxford. Honorary LLD Glasgow. Chevalier of the Civil Order of Savoy 1905. Royal Society of Arts Albert Medal. Honorary knighthood (GCVO) 1914. Institute of Electrical and Electronics Engineers Medal of Honour 1920. Chairman, Royal Society of Arts 1924. Created Marquis (Marchese) 1929. Nominated to the Italian Senate 1929. President, Italian Academy 1930. Rector, University of St Andrews, Scotland, 1934.Bibliography1896, "Improvements in transmitting electrical impulses and in apparatus thereof", British patent no. 12,039.1 June 1898, British patent no. 12,326 (transformer or "jigger" resonant circuit).1901, British patent no. 7,777 (selective tuning).1904, British patent no. 763,772 ("four circuit" tuning arrangement).Further ReadingD.Marconi, 1962, My Father, Marconi.W.J.Baker, 1970, A History of the Marconi Company, London: Methuen.KFBiographical history of technology > Marconi, Marchese Guglielmo
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9 связь
(напр. эталонов) echelon, binding, association, bond, bonding, ( элемент) balk, band, belt, brace, communications, communication, conjunction, connection, constraint мех., coupling, brace rod, link, linkage, restraint, ( в опалубке) tie spacer, stay, telecommunications, ( программ) thread, tie* * *связь ж.1. communicationвести́ связь — he engaged in communication, communicateвходи́ть в связь без по́иска и подстро́йки — select [work] a preset frequency [a preset station]входи́ть в связь с … — establish communication with …выходи́ть из свя́зи — terminate (the) contactвыходи́ть на связь — get on [go on the air] for a radio contactдава́ть связь по обхо́ду — divert the traffic, reroute«для веде́ния свя́зи нажми́ танге́нту …» — “to communicate, press the push-to-talk switch”зака́нчивать сеа́нс свя́зи — sign offконтроли́ровать прохожде́ние свя́зи — monitor the copyначина́ть сеа́нс свя́зи — sign onпереходи́ть на связь c, напр. диспе́тчерской слу́жбой подхо́да ав. — change to, e. g., approach controlпереходи́ть на связь с., напр. КПД ав. — change to, e. g., towerподде́рживать связь в усло́виях поме́х [глуше́ния] — communicate through jamming«разреши́те зако́нчить связь?» ( запрос с самолёта) ав. — “request permission to switch off my station”устана́вливать связь — establish communication, establish contact, contact«установи́те связь с КДП Шереме́тьево!» ( распоряжение с КДП самолёту) ав. — “contact Sheremetevo tower!”2. (в атомах, молекулах, соединениях) bond, linkразрыва́ть связь — split a bondукомплекто́вывать связь (напр. в атоме) — satisfy a bondэ́та связь неукомплекто́вана — this is an unsatisfied bond3. (в цепях, между цепями и элементами) элк. couplingсвязь ме́жду А и В — ё́мкостная — A is capacitively coupled (in)to Bс като́дной свя́зью — cathode-coupled4. ( в расчётных схемах)1) ( ограничение) constraint, restraint2) ( элемент физической конструкции) stay; tieнакла́дывать связь — impose a constraint, exercise a restraint, restrain5. ( в математической логике) unionавари́йная связь — emergency communicationавиацио́нная связь — aeronautical communicationавтотрансформа́торная связь — tapped-coil couplingадгезио́нная связь — adhesive bondа́нкерная связь — anchor tieба́лочная связь — tie beamбесподстро́ечная (беспоиско́вая) связь радио — instant selection of preset [pretuned] channels [stations]вести́ бесподстро́ечную беспоиско́вую связь — select [contact] a preset stationвале́нтная связь — valence bond, valence linkветрова́я связь — wind tieволоко́нно-опти́ческая связь — fibre-optics communicationгальвани́ческая связь — conductive [resistive] couplingгеометри́ческая связь — geometric constraintгироскопи́ческая связь — gyroscopic couplingглоба́льная связь — global [world-wide] communicationдвусторо́нняя связь1. bilateral constraint2. two-way communicationди́плексная связь — diplex operate, diplex workingдифференциа́льная связь мат. — differential constraintсвязь для специа́льных служб радио — emergency-service communcationдо́норная связь — donor bondдро́ссельная связь — impedance couplingдро́ссельно-ё́мкостная связь — impendance-capacitance couplingдупле́ксная связь — duplex operation, duplex workingё́мкостная связь — capacitive couplingё́мкостно-резисти́вная связь — capacitance-resistance [RC] couplingжё́сткая связь элк. — tight couplingсвязь жё́сткости мех. — braceсо свя́зями жё́сткости — bracedсвязь жё́сткости, рабо́тающая на растяже́ние — tension braceсвязь жё́сткости, рабо́тающая на сжа́тие — push braceзвукоподво́дная связь — underwater sonar communicationсвязь земля́ — самолё́т — ground-to-air communicationиндукти́вная связь — inductive couplingио́нная связь — ionic [electrovalent] bondкато́дная связь — cathode couplingсвязь КВ — high-frequency [HF] communication(s)связь ко́нтуров, ё́мкостная вне́шняя — series capacitive couplingсвязь ко́нтуров, ё́мкостная вну́тренняя — shunt capacitive couplingсвязь ко́нтуров, непо́лная элк. — tapped-down connection, tapping-downко́нтур име́ет непо́лную связь с ла́мпой — there is tapped-down connection from the tuned circuit to the tubeсвязь ко́нтуров, по́лная — untapped connectionсвязь входно́го ко́нтура с управля́ющей се́ткой, по́лная — there is untapped connection from the input tuned circuit to the control grid, the grid is connected across the whole of the input circuitсвязь ко́рпуса су́дна — (strength) member of a ships hullкорреляцио́нная связь — correlationкосми́ческая связь — space communicationкра́тная связь — multiple bondприсоединя́ть по ме́сту кра́тных свя́зей — add to multiple bondsкрити́ческая связь — critical couplingла́зерная связь — laser(-beam) communicationсвязь ме́жду систе́мами — intersystem communicationмежсисте́мная связь — intersystem communicationметалли́ческая связь — metallic bondметео́рная связь — meteor burst communicationмногокана́льная связь — multichannel communicationмоби́льная связь — vehicular communicationнеуде́рживающая связь — unilateral constraintsобра́тная связь — feedbackохва́тывать обра́тной свя́зью — place a feedback path [loop] around [over] …, apply feedbackохва́тывать обра́тной свя́зью большо́й глубины́ — apply a large amount of feedbackохва́тывать обра́тной свя́зью какой-л. каска́д — apply feedback to such-and-such stageобра́тная, акусти́ческая связь — acoustic(al) feedbackобра́тная, вну́тренняя связь полупр. — intrinsic feedbackобра́тная, ги́бкая связь — vanishing feenbackобра́тная, ё́мкостная связь — capacitive feedbackобра́тная, жё́сткая связь — unity [direct] feedbackобра́тная, заде́ржанная связь — delayed feedbackобра́тная, заде́рживающая связь — delaving feedbackобра́тная, избира́тельная связь — selective feedbackобра́тная, изодро́мная связь — proportional-plus-integral feedbackобра́тная, индукти́вная связь — inductive feedbackобра́тная, кванто́ванная связь — quantized feedbackобра́тная, многоко́нтурная связь — multiloop feedbackобра́тная, отрица́тельная связь — negative [degenerative] feedbackобра́тная, положи́тельная связь — positive [regenerative] feedbackобра́тная связь по напряже́нию — voltage feedbackобра́тная связь по огиба́ющей — envelope feedbackобра́тная связь по положе́нию — position feedbackобра́тная связь по произво́дной — rate feedbackобра́тная связь по ско́рости — velocity [rate] feedbackобра́тная связь по то́ку — current feedbackобра́тная связь по ускоре́нию — acceleration feedbackобра́тная связь по частоте́ — frequency feedbackобра́тная, пропорциона́льная связь — proportional feedbackобра́тная, резисти́вная связь — resistive feedbackобра́тная, стабилизи́рующая связь — stabilizing feedbackодина́рная связь — single bondодносторо́нняя связь1. unilateral constraint2. one-way connection, one-way operation, one-way workingоптима́льная связь — optimum couplingопти́ческая связь — optical communicationпарази́тная связь — stray [spurious] couplingполудупле́ксная связь — half-duptex operation, half-duplex workingпопере́чная связь1. cross-linkage, cross bond2. мех. transverse [cross] braceпричи́нная связь — causalityпроводна́я связь — wire communicationпроводна́я, в. ч. связь — carrier-current communicationпряма́я связь — feedforwardрадиореле́йная связь — radio-relay communicationрадиотелегра́фная связь — radiotetegraphy, radiotelegraph communicationрадиотелефо́нная связь — radiotelephone (service)реоста́тная связь — resistance couplingреоста́тно-ё́мкостная связь — resistance-capacitance [RC] couplingсвязь самолё́т — земля́ — air-to-ground communicationсвязь самолё́т — самолё́т — plane-to-plane [air-to-air] communicationсверхкрити́ческая связь — overcritical couplingсвязь СВЧ ( не путать со свя́зью на сантиметро́вых дли́нах волн) — microwave communication(s) (not to he confused with SHF; in Russian usage, СВЧ — microwaves)связь с высо́ким у́ровнем шумо́в — noisy communicationсвязь с высо́кой информацио́нной ё́мкостью — high-capacity communicationселе́кторная связь — intercom telephonyси́мплексная связь — simplex operation, simplex workingсвязь с испо́льзованием (да́льнего) тропосфе́рного рассе́яния — tropospheric scatter [troposcatter] communicationсопряжё́нные свя́зи хим. — conjugated bondsспин-орбита́льная связь — spin-orbit couplingтелегра́фная связь1. ( обмен) telegraphy, telegraph communication2. ( соединение) telegraph connectionтелегра́фная, пряма́я междунаро́дная связь — direct international (telegraph) connectionтелефо́нная связь — telephony, telephone communication, telephone serviceтелефо́нная, междугоро́дная связь — long-distance [toll] telephonyтелефо́нная связь тона́льной частоты́ — voice-frequency telephonyтрансформа́торная связь элк. — transformer couplingуде́рживающая связь — bilateral constraintсвязь УКВ — VHF/ UHF communication(s)факси́мильная связь — facsimile (service)фототелегра́фная связь — facsimile (service)хими́ческая связь — chemical bondциркуля́рная связь — conference connectionцифрова́я связь — digital communicationсвязь че́рез иску́сственный спу́тник Земли́ — satellite-assisted communicationщелева́я связь — slot couplingэлектро́нная связь — ejectron couplingэлектростати́ческая связь — electrostatic coupling -
10 радиотелеграфная связь
1) Engineering: radiotelegraph communication, radiotelegraphy communication2) Telecommunications: wireless telegraphy3) Household appliances: radio telegraphy, radiotelegraphyУниверсальный русско-английский словарь > радиотелеграфная связь
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11 Baudot, Jean-Maurice-Emile
[br]b. 11 September 1845 Magneux, Franced. 28 March 1903 Sceaux, France[br]French engineer who developed the multiplexed telegraph and devised a 5-bit code for data communication and control.[br]Baudot had no formal education beyond his local primary school and began his working life as a farmer, as was his father. However, in September 1869 he joined the French telegraph service and was soon sent on a course on the recently developed Hughes printing telegraph. After service in the Franco-Prussian war as a lieutenant with the military telegraph, he returned to his civilian duties in Paris in 1872. He was there encouraged to develop (in his own time!) a multiple Hughes system for time-multiplexing of several telegraph messages. By using synchronized clockwork-driven rotating switches at the transmitter and receiver he was able to transmit five messages simultaneously; the system was officially adopted by the French Post \& Telegraph Administration five years later. In 1874 he patented the idea of a 5-bit (i.e. 32-permutation) code, with equal on and off intervals, for telegraph transmission of the Roman alphabet and punctuation signs and for control of the typewriter-like teleprinter used to display the message. This code, known as the Baudot code, was found to be more economical than the existing Morse code and was widely adopted for national and international telegraphy in the twentieth century. In the 1970s it was superseded by 7—and 8-bit codes.Further development of his ideas on multiplexing led in 1894 to methods suitable for high-speed telegraphy. To commemorate his contribution to efficient telegraphy, the unit of signalling speed (i.e. the number of elements transmitted per second) is known as the baud.[br]Bibliography17 June 1874, "Système de télégraphie rapide" (Baudot's first patent).Further Reading1965, From Semaphore to Satellite, Geneva: International Telecommunications Union.P.Lajarrige, 1982, "Chroniques téléphoniques et télégraphiques", Collection historique des télécommunications.KFBiographical history of technology > Baudot, Jean-Maurice-Emile
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12 зв'язок
ч1) ( взаємна залежність) connection, link; relationпричинний зв'язок — causal relationship, causality
2) мн.зв'язки (відносини, стосунки) — connections, contacts, ties, relations
3) тк. мн. ( знайомства) connections4) ( інтимний) liaisonпрямий зв'язок — hot line; point-to-point communication
радіолокаційний зв'язок — radar contact, radio contact
6) ( установа) ( postal and tele-) communicationsвідділення зв'язку — ( branch) post office
7) хім. bond8)в зв'язку з — because of, in view of, in connection with, in connexion with, in light of, owing to, as a result of, on the grounds of
в зв'язку з цим — in this connection, in this connexion, as a result ( of this)
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13 De Forest, Lee
SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics, Recording, Telecommunications[br]b. 26 August 1873 Council Bluffs, Iowa, USAd. 30 June 1961 Hollywood, California, USA[br]American electrical engineer and inventor principally known for his invention of the Audion, or triode, vacuum tube; also a pioneer of sound in the cinema.[br]De Forest was born into the family of a Congregational minister that moved to Alabama in 1879 when the father became President of a college for African-Americans; this was a position that led to the family's social ostracism by the white community. By the time he was 13 years old, De Forest was already a keen mechanical inventor, and in 1893, rejecting his father's plan for him to become a clergyman, he entered the Sheffield Scientific School of Yale University. Following his first degree, he went on to study the propagation of electromagnetic waves, gaining a PhD in physics in 1899 for his thesis on the "Reflection of Hertzian Waves from the Ends of Parallel Wires", probably the first US thesis in the field of radio.He then joined the Western Electric Company in Chicago where he helped develop the infant technology of wireless, working his way up from a modest post in the production area to a position in the experimental laboratory. There, working alone after normal working hours, he developed a detector of electromagnetic waves based on an electrolytic device similar to that already invented by Fleming in England. Recognizing his talents, a number of financial backers enabled him to set up his own business in 1902 under the name of De Forest Wireless Telegraphy Company; he was soon demonstrating wireless telegraphy to interested parties and entering into competition with the American Marconi Company.Despite the failure of this company because of fraud by his partners, he continued his experiments; in 1907, by adding a third electrode, a wire mesh, between the anode and cathode of the thermionic diode invented by Fleming in 1904, he was able to produce the amplifying device now known as the triode valve and achieve a sensitivity of radio-signal reception much greater than possible with the passive carborundum and electrolytic detectors hitherto available. Patented under the name Audion, this new vacuum device was soon successfully used for experimental broadcasts of music and speech in New York and Paris. The invention of the Audion has been described as the beginning of the electronic era. Although much development work was required before its full potential was realized, the Audion opened the way to progress in all areas of sound transmission, recording and reproduction. The patent was challenged by Fleming and it was not until 1943 that De Forest's claim was finally recognized.Overcoming the near failure of his new company, the De Forest Radio Telephone Company, as well as unsuccessful charges of fraudulent promotion of the Audion, he continued to exploit the potential of his invention. By 1912 he had used transformer-coupling of several Audion stages to achieve high gain at radio frequencies, making long-distance communication a practical proposition, and had applied positive feedback from the Audion output anode to its input grid to realize a stable transmitter oscillator and modulator. These successes led to prolonged patent litigation with Edwin Armstrong and others, and he eventually sold the manufacturing rights, in retrospect often for a pittance.During the early 1920s De Forest began a fruitful association with T.W.Case, who for around ten years had been working to perfect a moving-picture sound system. De Forest claimed to have had an interest in sound films as early as 1900, and Case now began to supply him with photoelectric cells and primitive sound cameras. He eventually devised a variable-density sound-on-film system utilizing a glow-discharge modulator, the Photion. By 1926 De Forest's Phonofilm had been successfully demonstrated in over fifty theatres and this system became the basis of Movietone. Though his ideas were on the right lines, the technology was insufficiently developed and it was left to others to produce a system acceptable to the film industry. However, De Forest had played a key role in transforming the nature of the film industry; within a space of five years the production of silent films had all but ceased.In the following decade De Forest applied the Audion to the development of medical diathermy. Finally, after spending most of his working life as an independent inventor and entrepreneur, he worked for a time during the Second World War at the Bell Telephone Laboratories on military applications of electronics.[br]Principal Honours and DistinctionsInstitute of Electronic and Radio Engineers Medal of Honour 1922. President, Institute of Electronic and Radio Engineers 1930. Institute of Electrical and Electronics Engineers Edison Medal 1946.Bibliography1904, "Electrolytic detectors", Electrician 54:94 (describes the electrolytic detector). 1907, US patent no. 841,387 (the Audion).1950, Father of Radio, Chicago: WIlcox \& Follett (autobiography).De Forest gave his own account of the development of his sound-on-film system in a series of articles: 1923. "The Phonofilm", Transactions of the Society of Motion Picture Engineers 16 (May): 61–75; 1924. "Phonofilm progress", Transactions of the Society of Motion Picture Engineers 20:17–19; 1927, "Recent developments in the Phonofilm", Transactions of the Society of Motion Picture Engineers 27:64–76; 1941, "Pioneering in talking pictures", Journal of the Society of Motion Picture Engineers 36 (January): 41–9.Further ReadingG.Carneal, 1930, A Conqueror of Space (biography).I.Levine, 1964, Electronics Pioneer, Lee De Forest (biography).E.I.Sponable, 1947, "Historical development of sound films", Journal of the Society of Motion Picture Engineers 48 (April): 275–303 (an authoritative account of De Forest's sound-film work, by Case's assistant).W.R.McLaurin, 1949, Invention and Innovation in the Radio Industry.C.F.Booth, 1955, "Fleming and De Forest. An appreciation", in Thermionic Valves 1904– 1954, IEE.V.J.Phillips, 1980, Early Radio Detectors, London: Peter Peregrinus.KF / JW -
14 Poulsen, Valdemar
[br]b. 23 November 1869 Copenhagen, Denmarkd. 23 July 1942 Gentofte, Denmark[br]Danish engineer who developed practical magnetic recording and the arc generator for continuous radio waves.[br]From an early age he was absorbed by phenomena of physics to the exclusion of all other subjects, including mathematics. When choosing his subjects for the final three years in Borgedydskolen in Christianshavn (Copenhagen) before university, he opted for languages and history. At the University of Copenhagen he embarked on the study of medicine in 1889, but broke it off and was apprenticed to the machine firm of A/S Frichs Eftf. in Aarhus. He was employed between 1893 and 1899 as a mechanic and assistant in the laboratory of the Copenhagen Telephone Company KTAS. Eventually he advanced to be Head of the line fault department. This suited his desire for experiment and measurement perfectly. After the invention of the telegraphone in 1898, he left the laboratory and with responsible business people he created Aktieselskabet Telegrafonen, Patent Poulsen in order to develop it further, together with Peder Oluf Pedersen (1874– 1941). Pedersen brought with him the mathematical background which eventually led to his professorship in electronic engineering in 1922.The telegraphone was the basis for multinational industrial endeavours after it was demonstrated at the 1900 World's Exhibition in Paris. It must be said that its strength was also its weakness, because the telegraphone was unique in bringing sound recording and reproduction to the telephone field, but the lack of electronic amplifiers delayed its use outside this and the dictation fields (where headphones could be used) until the 1920s. However, commercial interest was great enough to provoke a number of court cases concerning patent infringement, in which Poulsen frequently figured as a witness.In 1903–4 Poulsen and Pedersen developed the arc generator for continuous radio waves which was used worldwide for radio transmitters in competition with Marconi's spark-generating system. The inspiration for this work came from the research by William Duddell on the musical arc. Whereas Duddell had proposed the use of the oscillations generated in his electric arc for telegraphy in his 1901 UK patent, Poulsen contributed a chamber of hydrogen and a transverse magnetic field which increased the efficiency remarkably. He filed patent applications on these constructions from 1902 and the first publication in a scientific forum took place at the International Electrical Congress in St Louis, Missouri, in 1904.In order to use continuous waves efficiently (the high frequency constituted a carrier), Poulsen developed both a modulator for telegraphy and a detector for the carrier wave. The modulator was such that even the more primitive spark-communication receivers could be used. Later Poulsen and Pedersen developed frequency-shift keying.The Amalgamated Radio-Telegraph Company Ltd was launched in London in 1906, combining the developments of Poulsen and those of De Forest Wireless Telegraph Syndicate. Poulsen contributed his English and American patents. When this company was liquidated in 1908, its assets were taken over by Det Kontinentale Syndikat for Poulsen Radio Telegrafi, A/S in Copenhagen (liquidated 1930–1). Some of the patents had been sold to C.Lorenz AG in Berlin, which was very active.The arc transmitting system was in use worldwide from about 1910 to 1925, and the power increased from 12 kW to 1,000 kW. In 1921 an exceptional transmitter rated at 1,800 kW was erected on Java for communications with the Netherlands. More than one thousand installations had been in use worldwide. The competing systems were initially spark transmitters (Marconi) and later rotary converters ( Westinghouse). Similar power was available from valve transmitters only much later.From c. 1912 Poulsen did not contribute actively to further development. He led a life as a well-respected engineer and scientist and served on several committees. He had his private laboratory and made experiments in the composition of matter and certain resonance phenomena; however, nothing was published. It has recently been suggested that Poulsen could not have been unaware of Oberlin Smith's work and publication in 1888, but his extreme honesty in technical matters indicates that his development was indeed independent. In the case of the arc generator, Poulsen was always extremely frank about the inspiration he gained from earlier developers' work.[br]Bibliography1899, British patent no. 8,961 (the first British telegraphone patent). 1903, British patent no. 15,599 (the first British arc-genera tor patent).His scientific publications are few, but fundamental accounts of his contribution are: 1900, "Das Telegraphon", Ann. d. Physik 3:754–60; 1904, "System for producing continuous oscillations", Trans. Int. El. Congr. St. Louis, Vol. II, pp. 963–71.Further ReadingA.Larsen, 1950, Telegrafonen og den Traadløse, Ingeniørvidenskabelige Skrifter no. 2, Copenhagen (provides a very complete, although somewhat confusing, account of Poulsen's contributions; a list of his patents is given on pp. 285–93).F.K.Engel, 1990, Documents on the Invention of Magnetic Re cor ding in 1878, New York: Audio Engineering Society, reprint no. 2,914 (G2) (it is here that doubt is expressed about whether Poulsen's ideas were developed independently).GB-N -
15 факсимильная связь
1) Military: facsimile communications, phototelegraph communication, phototelegraph communications, telephoto2) Engineering: facsimile, facsimile communication, facsimile service, facsimile telegraph, phototelegraphy, picture telegraph, telephotography3) Telecommunications: fax connection, fax function4) Electronics: picture telegraphy, radiophoto, radiophotography, telephotography telephoto, wirephoto5) Information technology: facsimile posting, fax6) Household appliances: fax communication7) Network technologies: FACS8) Automation: facsimile transmissionУниверсальный русско-английский словарь > факсимильная связь
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16 Chappe, Claude
SUBJECT AREA: Telecommunications[br]b. 25 December 1763 Brulon, Franced. 23 January 1805 Paris, France[br]French engineer who invented the semaphore visual telegraph.[br]Chappe began his studies at the Collège de Joyeuse, Rouen, and completed them at La Flèche. He was educated for the church with the intention of becoming an Abbé Commendataire, but this title did not in fact require him to perform any religious duties. He became interested in natural science and amongst other activities he carried out experiments with electrically charged soap bubbles.When the bénéfice was suppressed in 1781 he returned home and began to devise a system of telegraphic communication. With the help of his three brothers, particularly Abraham, and using an old idea, in 1790 he made a visual telegraph with suspended pendulums to relay coded messages over a distance of half a kilometre. Despite public suspicion and opposition, he presented the idea to the Assemblée Nationale on 22 May 1792. No doubt due to the influence of his brother, Ignace, a member of the Assemblée Nationale, the idea was favourably received, and on 1 April 1793 it was referred to the National Convention as being of military importance. As a result, Chappe was given the title of Telegraphy Engineer and commissioned to construct a semaphore (Gk. bearing a sign) link between Paris and Lille, a distance of some 240 km (150 miles), using twenty-two towers. Each station contained two telescopes for observing the adjacent towers, and each semaphore consisted of a central beam supporting two arms, whose positions gave nearly two hundred possible arrangements. Hence, by using a code book as a form of lookup table, Chappe was able to devise a code of over 8,000 words. The success of the system for communication during subsequent military conflicts resulted in him being commissioned to extend it with further links, a work that was continued by his brothers after his suicide during a period of illness and depression. Providing as it did an effective message speed of several thousand kilometres per hour, the system remained in use until the mid-nineteenth century, by which time the electric telegraph had become well established.[br]Further ReadingR.Appleyard, 1930, Pioneers of Electrical Communication.International Telecommunications Union, 1965, From Semaphore to Satellite, Geneva.See also: Morse, Samuel Finley BreezeKF -
17 телеграфная радиосвязь
1) Military: radiotelegraphy, record communication, record communications, recorded communications, wireless telegraphy2) Engineering: radiotelegraph, telegraph radio communicationУниверсальный русско-английский словарь > телеграфная радиосвязь
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18 телетайпная связь
1) Military: teletype communications2) Engineering: teleprinter exchange3) Economy: teletype network4) Telecommunications: printing telegraphy, teletype communication, teletypewriter-exchange5) Oil: teletypewriter exchange6) Security: teleprinter communication -
19 телеграфная связь
Russian-English dictionary of telecommunications > телеграфная связь
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20 Fernschreiben
n1. alphabetic telegraphy2. teleprinted communication3. teleprinter communication4. telex
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