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1 electromagnetic telephone
Телекоммуникации: электромагнитный телефонУниверсальный англо-русский словарь > electromagnetic telephone
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2 electromagnetic telephone
English-Russian dictionary of telecommunications and their abbreviations > electromagnetic telephone
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3 electromagnetic telephone cap
Телекоммуникации: электромагнитный телефонный капсюльУниверсальный англо-русский словарь > electromagnetic telephone cap
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4 electromagnetic telephone cap
English-Russian dictionary of telecommunications and their abbreviations > electromagnetic telephone cap
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5 telephone
1) телефонный аппарат, ТФА, телефон•- battle telephone
- bridging telephone
- broadband telephone
- candlestick telephone
- capsular telephone
- chief telephone
- coin-box telephone
- combined telephone
- cordless telephone
- desk-top telephone
- dial-tone telephone
- direct communication telephone
- diving telephone
- drive-up telephone
- dropproof telephone
- electrically-powered telephone
- electrodynamic telephone
- electromagnetic telephone
- emergency telephone
- field telephone
- fireproof telephone
- flat telephone
- handset telephone
- hands-free telephone
- high-reliable telephone
- hood telephone
- intelligence telephone
- international telephone
- keypad telephone
- loudspeaking telephone
- mechanic team telephone
- mine telephone
- mobile cellular telephone
- monetary telephone
- multifunctional telephone
- on-hook telephone
- optical telephone
- PBX computer telephone
- PC add-on telephone
- picture telephone
- piezoelectric telephone
- programmed telephone
- push-button telephone
- radio telephone
- resonance telephone
- second generation telephone
- secretary telephone
- service section telephone
- shed-master assistant telephone
- ship-borne telephone
- sound-powered telephone
- spark-proof telephone
- special telephone
- standalone computer telephone
- stationary telephone
- submarine telephone
- subscriber telephone
- system telephone
- television telephone
- train-master telephone
- trimline telephone
- two-mode cellular telephone
- two-pole telephone
- two-wire telephone
- underwater telephone
- universal telephone
- wall-mounted telephone
- wall-telephoneEnglish-Russian dictionary of telecommunications and their abbreviations > telephone
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6 telephone receiver
English-Russian big polytechnic dictionary > telephone receiver
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7 electromagnetic disturbance
The English-Russian dictionary general scientific > electromagnetic disturbance
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8 электромагнитный телефонный капсюль
Russian-English dictionary of telecommunications > электромагнитный телефонный капсюль
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9 электромагнитный телефон
1) Engineering: electromagnetic receiver2) Telecommunications: electromagnetic telephoneУниверсальный русско-английский словарь > электромагнитный телефон
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10 электромагнитный телефон
Russian-English dictionary of telecommunications > электромагнитный телефон
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11 электромагнитный телефонный капсюль
Telecommunications: electromagnetic telephone capУниверсальный русско-английский словарь > электромагнитный телефонный капсюль
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12 cap
1) крышка, колпак, наконечник•- earphones cap
- electromagnetic telephone cap
- one-piece microphone capEnglish-Russian dictionary of telecommunications and their abbreviations > cap
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13 system
система; комплекс; средство; способ; метод; сеть (напр. дорог) ;aiming-navigation system (analog, digital) — прицельно-навигационная система (аналоговая, цифровая)
air observation, acquisition and fire control system — (бортовая) система воздушной разведки, засечки целей и управления огнем
air support aircraft ECM (equipment) system — (бортовая) система РЭП для самолетов авиационной поддержки
airborne (ground) target acquisition and illumination laser system — ав. бортовая лазерная система обнаружения и подсветки (наземных) целей
airborne (ground) targeting and laser designator system — ав. бортовая лазерная система обнаружения и целеуказания (наземных целей)
airborne laser illumination, ranging and tracking system — ав. бортовая система лазерной подсветки, определения дальности и сопровождения цели
artillery (nuclear) delivery system — артиллерийская система доставки (ядерного) боеприпаса (к цели)
C2 system — система оперативного управления; система руководства и управления
C3 system — система руководства, управления и связи; система оперативного управления и связи
channel and message switching (automatic) communications system — АСС с коммутацией каналов и сообщений
country-fair type rotation system (of instruction) — метод одновременного обучения [опроса] нескольких учебных групп (переходящих от одного объекта изучения к другому)
dual-capable (conventional/nuclear) weapon delivery system — система доставки (обычного или ядерного) боеприпаса к цели
electromagnetic emitters identification, location and suppression system — система обнаружения, опознавания и подавления источников электромагнитных излучений [излучающих РЭС]
field antimissile (missile) system — полевой [войсковой] ПРК
fire-on-the-move (air defense) gun system — подвижный зенитный артиллерийский комплекс для стрельбы в движении [на ходу]
fluidic (missile) control system — ркт. гидравлическая [струйная] система управления полетом
forward (area) air defense system — система ПВО передового района; ЗРК для войсковой ПВО передового района
graduated (availability) operational readiness system — Бр. система поэтапной боевой готовности (частей и соединений)
high-resolution satellite IR detection, tracking and targeting system — спутниковая система с ИК аппаратурой высокой разрешающей способности для обнаружения, сопровождения целей и наведения средств поражения
ICBM (alarm and) early warning satellite system — спутниковая система обнаружения пусков МБР и раннего предупреждения (средств ПРО)
information storage, tracking and retrieval system — система накопления, хранения и поиска информации
instantaneous grenade launcher (armored vehicle) smoke system — гранатомет (БМ) для быстрой постановки дымовой завесы
Precision Location [Locator] (and) Strike system — высокоточная система обеспечения обнаружения и поражения целей; высокоточный разведывательно-ударный комплекс
rapid deceleration (parachute) delivery system — парашютная система выброски грузов с быстрым торможением
real time, high-resolution reconnaissance satellite system — спутниковая разведывательная система с высокой разрешающей способностью аппаратуры и передачей информации в реальном масштабе времени
received signal-oriented (output) jamming signal power-adjusting ECM system — система РЭП с автоматическим регулированием уровня помех в зависимости от мощности принимаемого сигнала
sea-based nuclear (weapon) delivery system — система морского базирования доставки ядерного боеприпаса к цели
small surface-to-air ship self-defense (missile) system — ЗРК ближнего действия для самообороны корабля
Status Control, Alerting and Reporting system — система оповещения, контроля и уточнения состояния [боевой готовности] сил и средств
surface missile (weapon) system — наземный [корабельный] РК
target acquisition, rapid designation and precise aiming system — комплекс аппаратуры обнаружения цели, быстрого целеуказания и точного прицеливания
— ABM defense system— antimissile missile system— central weapon system— countersurprise military system— laser surveying system— tank weapon system— vertical launching system— weapons system -
14 system
1) система || системный3) вчт операционная система; программа-супервизор5) вчт большая программа6) метод; способ; алгоритм•system halted — "система остановлена" ( экранное сообщение об остановке компьютера при наличии серьёзной ошибки)
- CPsystem- H-system- h-system- hydrogen-air/lead battery hybrid system- Ksystem- Lsystem- L*a*b* system- master/slave computer system- p-system- y-system- Δ-system -
15 coil
1) спираль || формировать спираль; скручивать в спираль3) обмотка; намотка; катушка || обматывать(ся); наматывать(ся)5) соленоид6) рулон (напр. перфоленты)7) навивка || навивать(ся)8) клубок ( полимерной цепи) || образовывать клубок ( полимерной цепи)•- air-core coil
- air-cored coil
- antenna coil
- antenna loading coil
- anti-sidetone induction coil
- armature coil
- axially-symmetric coil
- B-coil
- balance coil
- base-loaded coil
- bending coil
- bent-head coil-
- bias coil
- bifilar coil
- blank coil
- blow-out coil
- bridging coil
- bubble memory coil
- bucking coil
- bypass coil
- cancellation coil
- carrier isolating choke coil
- carrier tap choke coil
- carrier tap transmission choke coil
- centering coil
- choke coil
- circular-head coil
- closing coil
- coiled coil
- compensating coil
- composite IF coil
- concentric-wound coil
- convergence coil
- core coil
- cored coil
- correction coil
- coupling coil
- crisscross coil
- deflecting coil
- deflection coil
- degaussing coil
- demagnetizing coil
- diamond coil
- digit coil
- donut coil
- double-wound coil
- doughnut coil
- drainage coil
- duolateral coil
- dust-core coil
- electrically variable coil
- electromagnetic coil
- electromagnetic-deflection coil
- elevator coil
- energizing coil
- exciting coil
- exploring coil
- ferrite coil
- ferrite -core coil
- field coil
- field-neutralizing coil
- flip coil
- focusing coil
- form-wound coil
- frame coil
- frame-deflection coil
- GA coil
- gap-air coil
- ground-equalizer coil
- guidance coil
- H-coil
- hairpin coil
- head coil
- heat coil
- Helmholtz coils
- holding coil
- honeycomb coil
- horizontal-deflection coil
- hum-bucking coil
- hybrid coil
- ignition coil
- impedance coil
- impregnated coil
- inductance coil
- induction coil
- iron-core coil
- kicking coil
- lattice-wound coil
- line-deflection coil
- load coil
- loading coil
- loudspeaker voice coil
- magnetic coil
- magnetic biasing coil
- magnetic convergence coil
- magnetic test -coil
- mirror coil
- motor coil
- moving coil
- multipole coil
- multisection coil
- no-former coil
- nonlinear coil
- nonuniformly wound coil
- Odin coil
- open-ended coil
- opposing coils
- oscillator coil
- pancake coil
- peaking coil
- pickup coil
- picture control coil
- plug-in coil
- primary coil
- printed coil
- Pupin coil
- purity coil
- radio-frequency coil
- reactance coil
- relay coil
- ring-shaped coil
- rotating exploring coil
- rotor coil
- saddle coils
- scanning coil
- scramble-wound coil
- search coil
- secondary coil
- self-supported coil
- series coil
- shading coil
- side-circuit loading coil
- side-curcuit repeating coil
- simplex coil
- single-turn coil
- spark coil
- speaker voice coil
- speech coil
- spider-web coil
- stator coil
- straight-head coil
- sucking coil
- superconducting coil
- supercooled coil
- tapped coil
- telephone induction coil
- telephone loading coil
- telephone repeating coil
- telephone retardation coil
- Tesla coil
- thin-film ferrite coil
- tickler coil
- toroidal coil
- trip coil
- truncated quadrupole coil
- tuning coil
- unity-coupled coils
- variable coil
- vertical-deflection coil
- vibrating exploring coil
- voice coil
- work coil
- writing coil
- X-coil
- Y-coil -
16 coil
1) спираль || формировать спираль; скручивать в спираль3) обмотка; намотка; катушка || обматывать(ся); наматывать(ся)5) соленоид6) рулон (напр. перфоленты)7) навивка || навивать(ся)8) клубок ( полимерной цепи) || образовывать клубок ( полимерной цепи)•- air-cored coil
- antenna coil
- antenna loading coil
- anti-sidetone induction coil
- armature coil
- axially-symmetric coil
- B coil
- balance coil
- base-loaded coil
- bending coil
- bent-head coil
- bias coil
- bifilar coil
- blank coil
- blow-out coil
- bridging coil
- bubble memory coil
- bucking coil
- bypass coil
- cancellation coil
- carrier isolating choke coil
- carrier tap choke coil
- carrier tap transmission choke coil
- centering coil
- choke coil
- circular-head coil
- closing coil
- coil of wire
- coiled coil
- compensating coil
- composite IF coil
- concentric-wound coil
- convergence coil
- core coil
- cored coil
- correction coil
- coupling coil
- crisscross coil
- deflecting coil
- deflection coil
- degaussing coil
- demagnetizing coil
- diamond coil
- digit coil
- donut coil
- double-wound coil
- doughnut coil
- drainage coil
- duolateral coil
- dust-core coil
- electrically variable coil
- electromagnetic coil
- electromagnetic-deflection coil
- elevator coil
- energizing coil
- exciting coil
- exploring coil
- ferrlte coil
- ferrlte-core coil
- field coil
- field-neutralizing coil
- flip coil
- focusing coil
- form-wound coil
- frame coil
- frame-deflection coil
- GA coil
- gap-air coil
- ground-equalizer coil
- guidance coil
- hairpin coil
- H-coil
- head coil
- heat coil
- Helmholtz coils
- holding coil
- honeycomb coil
- horizontal-deflection coil
- hum-bucking coil
- hybrid coil
- ignition coil
- impedance coil
- impregnated coil
- inductance coil
- induction coil
- iron-core coil
- kicking coil
- lattice-wound coil
- line-deflection coil
- load coil
- loading coil
- loudspeaker voice coil
- magnetic biasing coil
- magnetic coil
- magnetic convergence coil
- magnetic test-coil
- mirror coil
- motor coil
- moving coil
- multipole coil
- multisection coil
- no-former coil
- nonlinear coil
- nonuniformly wound coil
- Odin coil
- open-ended coil
- opposing coils
- oscillator coil
- pancake coil
- peaking coil
- pickup coil
- picture control coil
- plug-in coil
- primary coil
- printed coil
- Pupin coil
- purity coil
- radio-frequency coil
- reactance coil
- relay coil
- ring-shaped coil
- rotating exploring coil
- rotor coil
- saddle coils
- scanning coil
- scramble-wound coil
- search coil
- secondary coil
- self-supported coil
- series coil
- shading coil
- side-circuit loading coil
- side-circuit repeating coil
- simplex coil
- single-turn coil
- spark coil
- speaker voice coil
- speech coil
- spider-web coil
- stator coil
- straight-head coil
- sucking coil
- superconducting coil
- supercooled coil
- tapped coil
- telephone induction coil
- telephone loading coil
- telephone repeating coil
- telephone retardation coil
- Tesla coil
- thin-film ferrite coil
- tickler coil
- toroidal coil
- trip coil
- truncated quadrupole coil
- tuning coil
- unity-coupled coils
- variable coil
- vertical-deflection coil
- vibrating exploring coil
- voice coil
- work coil
- writing coil
- X coil
- Y coilThe New English-Russian Dictionary of Radio-electronics > coil
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17 телефон
buzzer, telephone receiver* * *телефо́н м.1. ( преобразователь электрических колебаний в звук) earphone; ( в микротелефонной трубке) (telephone) receiver2. ( сокращённое название телефонного аппарата) telephone set, telephone instrument; разг. telephoneзвони́ть по телефо́ну — telephone, ring upпроизводи́ть зака́з по телефо́ну — telephone in an order3. ( сокращенное название телефонной связи) telephony, telephone service, telephone systemавтомати́ческий телефо́н — dial telephone setбезбатаре́йный телефо́н — sound-powered telephone setголовно́й телефо́н — headphoneка́псюльный телефо́н — inset receiverконденса́торный телефо́н — capacitor receiverмеждугоро́дный телефо́н — long-distance telephone service, long-distance telephone systemмеждунаро́дный телефо́н — international telephone serviceнасте́нный телефо́н — wall telephone setнасто́льный телефо́н — desk telephone setпаралле́льные телефо́ны — coupled telephone setsпротивоме́стный телефо́н — antisidetone telephone setпьезозлектри́ческий телефо́н — piezoelectric receiverручно́й телефо́н — hand telephone setтелефо́н систе́мы МБ — local-battery telephone setтелефо́н систе́мы ЦБ — common-battery telephone setтелефо́н с ме́стным эффе́ктом — sidetone telephone setспа́ренный телефо́н — call transfer-relay telephone setча́шечный телефо́н — ear-cap, earpieceэлектре́тный телефо́н — electret earphoneэлектродинами́ческий телефо́н — electrodynamic receiverэлектромагни́тный телефо́н — electromagnetic receiver* * * -
18 communication
1) связь, система связи; средства связи2) передача•- administrative-economic communication
- advanced shipboard communication
- aerial communication
- aeronautical communications
- air steward-to-air steward telephone communication
- airborne SHF-communication
- airborne-to-Earth communication
- aircraft communication
- air-to-air communication
- air-to-air voice communication
- air-to-ground electric communication
- Airways and Air communications
- all-mine telephone communication
- analog tropospheric communication
- analog-to-digital communication
- annunciating communication
- antenna communication
- asynchronous communication
- audio-conference communication
- audio-visual communication
- auroral long-distance communication
- automatic trunk communication
- auxiliary communication
- babyphone communication
- basic communication
- bathysphere-to-carrier-ship communication
- bidirectional communication
- binary-synchronous communication
- boat emergency communications
- both-way simultaneous communication
- branch telephone communication
- broadcast communication
- carrier-current communication
- car-to-car communication
- coastal center-to-coastal center communication
- code-independent data communication
- coherent-light communication
- combine wall communication
- command-telephone communication
- common-service communication
- common-using telegraph communication
- common-using telephone communication
- component triaxial communication
- computerized communication
- computer-to-computer communication
- conductor-to-departure responsible communication
- conference communication
- confidential special radio communication
- contact network communication
- contactless HF-communication
- contingency communication
- continuous communication
- control communication
- data communication
- data-transmission communication
- departmental engineering communication
- departmental telegraph communication
- digital communication
- digital-speech communication
- direct communication
- direct-pair communication
- direct-telephone communication
- disaster communication
- dispatch communication
- display communication
- distress communication
- district-by-district communication
- diversity communication
- diver-to-diver communication
- diving-service communication
- document electric communication
- documental conference communication
- duplex communication
- duplex radiotelephone communication
- Earth-to-airborne communication
- Earth-to-satellite communication
- Earth-to-space-to-Earth communication
- either-way communication
- electrical communication
- electromagnetic communication
- electronic communication
- emergency communication
- emergency ship radio communication
- enciphered-facsimile communication
- engineering station communication
- engineering-telephone communication
- everyone-to-everyone communication
- face communication
- fast-acting telephone communication
- fire-place communication
- fixed aeronautical communication
- fixed-electric communication
- fleet communication
- frequency-hop communication
- gateway-to-gateway communication
- ground-line communication
- group engineering communication
- half-duplex communication
- harmonic communication
- H-carrier communication
- HF-communication
- high-speed mobile communication
- house-car communication
- hydroacoustic communication
- incoming communication
- inductive mines communication
- industrial communication
- industrial-automatic communication
- industrial-engineering communication
- in-plant communication
- interaction communication
- interpaging communication
- interstation communication
- interstellar communication
- intersystem communication
- intraairplane telephone communication
- intrabasin selector communication
- intrabasin telegraph communication
- intrabasin telephone communication
- intrairport communication
- intraship communication
- intratrain telephone communication
- irregular communication
- isochronous communication
- land mobile communication
- land-to-space communication
- letter-printing communication
- lighting wire communication
- line communication
- line-path communication
- line-track telephone communication
- littoral radiotelephone communication
- local common service communication
- local engineering communication
- local telephone communication
- long-haul communication
- long-haul fiber-optical communication
- long-haul telephone communication
- loud-speaking communication
- main conference communication
- main engineering communication
- main radio communication
- manoeuvre radio communication
- man-to-machine communication
- marine communication
- marine facsimile communication
- meteor-burst communication
- meteoric-ionospheric communication
- microwave communication
- militarized guard communication
- mobile aeronautical communication
- mobile communication
- moon-bounce communication
- moorage-by-moorage communication
- movable communication
- MT administration-to-road communication
- multicast communication
- multichannel communication
- multimedia communication
- multiple channel class A communication
- multiple channel class B communication
- multiple channel class C communication
- multiple channel system radio communication
- multipoint communication
- navigating-service communication
- n-way communication
- office communication
- operative communication
- operative-dispatch communication
- operative-managing communication
- operative-repairing communication
- operator-to-train mobile communication
- oral communication
- outgoing communication
- packet communication
- passband data communication
- passenger-to-locomotive driver communication
- passenger-to-policemen communication
- phase-locked communication
- phototelegraph communication
- pilot-to-steward telephone communication
- plane-to-plane communication
- platform announcing communication
- platform radio communication
- platform-to-train mobile communication
- point-to-point communication
- power dispatch communication
- power line communication
- private bypass communication
- private-branch communication
- private-branch industrial communication
- pulse communication
- radial communication
- radial-aerial USB-communication
- radio link communication
- radio relay communication
- radio searching communication
- radiotelephone communication
- railway telephone communication
- real-time communication
- recording communication
- regional communication
- regular communication
- remote reference communication
- road communication
- road engineering communication
- road managing communication
- road power dispatch communication
- road service dispatch communication
- road servicing communication
- road telegraph communication
- rural communication
- safety communication
- satellite marine communication
- satellite-to-Earth communication
- satellite-to-satellite communication
- SB communication
- secure communication
- selector communication
- service communication
- service dispatch communication
- service section communication
- SHF-wave communication
- ship coastal facsimile communication
- ship-driver-to-ship-driver communication
- ship-radio communication
- ship-telephone communication
- ship-to-ship communication
- ship-to-spacecraft communication
- ship-to-submarine communication
- shore-to-ship communication
- short-band communication
- simplex communication
- simplex single-frequency communication
- simplex stripping communication
- simplex two-frequency communication
- single-channel communication
- single-frequency radio communication
- single-hop communication
- single-side loudspeaking communication
- sky-wave communication
- slope telephone communication
- sonic communication
- space communication
- space laser communication
- spacecraft-to-subscriber communication
- space-to-space communication
- special communication
- speech communication
- static-wire communication
- station communication
- station inductive communication
- station mobile communication
- station-by-station telephone communication
- station-radio communication
- steering cab-to-captain's cab communication
- steering cab-to-power dispatchboard communication
- steering cab-to-tiller compartment communication
- submarine laser communication
- submarine sound communication
- submarine TV-communication
- submarine-to-satellite communication
- submarine-to-submarine communication
- subscriber-to-workgroup communication
- switch point communication
- synchronous communication
- telegraphic communication
- telegraphic-telephone radio communication
- telephonist-to-diver communication
- telex communication
- ticket-dispatch communication
- time-bill communication
- train dispatch communication
- train inductive communication
- train radio communication
- train radiotelephone communication
- train radiowire telephone communication
- train-interstation communication
- train-master-to-station-master assistant communication
- train-master-to-train team communication
- train-to-movable object communication
- train-to-train radio communication
- transport police communication
- tropospheric communication
- tropospheric-scutter communication
- trunk communication
- tunnel train radio communication
- twilight scutter communication
- two-frequency radio communication
- two-side loudspeaking communication
- two-way alternative communication
- two-way simultaneous communication
- ultrasonic communication
- ultraviolet communication
- underground communication
- undersea optical communication
- underwater communication
- unwired earth current communication
- USB-communication
- variable frequency sync communication
- vehicle-to-vehicle communication
- videoconference communication
- videotelephone communication
- voice communication
- wagon-to-wagon mobile communication
- wall communication
- waterside communications
- waterside USB-communication
- wave conducting communication
- wire port communication
- wire radio communication
- wire telephone communication
- workgroup-to-workgroup communication
- world-wide telephone communicationEnglish-Russian dictionary of telecommunications and their abbreviations > communication
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19 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 -
20 Heaviside, Oliver
[br]b. 18 May 1850 London, Englandd. 2 February 1925 Torquay, Devon, England[br]English physicist who correctly predicted the existence of the ionosphere and its ability to reflect radio waves.[br]Brought up in poor, almost Dickensian, circumstances, at the age of 13 years Heaviside, a nephew by marriage of Sir Charles Wheatstone, went to Camden House Grammar School. There he won a medal for science, but he was forced to leave because his parents could not afford the fees. After a year of private study, he began his working life in Newcastle in 1870 as a telegraph operator for an Anglo-Dutch cable company, but he had to give up after only four years because of increasing deafness. He therefore proceeded to spend his time studying theoretical aspects of electrical transmission and communication, and moved to Devon with his parents in 1889. Because the operation of many electrical circuits involves transient phenomena, he found it necessary to develop what he called operational calculus (which was essentially a form of the Laplace transform calculus) in order to determine the response to sudden voltage and current changes. In 1893 he suggested that the distortion that occurred on long-distance telephone lines could be reduced by adding loading coils at regular intervals, thus creating a matched-transmission line. Between 1893 and 1912 he produced a series of writings on electromagnetic theory, in one of which, anticipating a conclusion of Einstein's special theory of relativity, he put forward the idea that the mass of an electric charge increases with its velocity. When it was found that despite the curvature of the earth it was possible to communicate over very great distances using radio signals in the so-called "short" wavebands, Heaviside suggested the presence of a conducting layer in the ionosphere that reflected the waves back to earth. Since a similar suggestion had been made almost at the same time by Arthur Kennelly of Harvard, this layer became known as the Kennelly-Heaviside layer.[br]Principal Honours and DistinctionsFRS 1891. Institution of Electrical Engineers Faraday Medal 1924. Honorary PhD Gottingen. Honorary Member of the American Association for the Advancement of Science.Bibliography1872. "A method for comparing electro-motive forces", English Mechanic (July).1873. Philosophical Magazine (February) (a paper on the use of the Wheatstone Bridge). 1889, Electromagnetic Waves.1892, Electrical Papers.1893–1912, Electromagnetic Theory.Further ReadingI.Catt (ed.), 1987, Oliver Heaviside, The Man, St Albans: CAM Publishing.P.J.Nahin, 1988, Oliver Heaviside, Sage in Solitude: The Life and Works of an Electrical Genius of the Victorian Age, Institute of Electrical and Electronics Engineers, New York.J.B.Hunt, The Maxwellians, Ithaca: Cornell University Press.See also: Appleton, Sir Edward VictorKF
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