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complete+prototype

  • 1 полный

    adj. full, complete, total, perfect, whole, everywhere defined;

    полное произведение - final product;
    полное пространство - complete space;
    полный дифференциал - total differential;
    полное упорядочение - linear ordering;
    полная ошибка - total error;
    полный прообраз - preimage, inverse image, complete prototype;
    полная аддитивность - complete additivity, countable additivity;
    полная информация - perfect information;
    полный класс (стратегий) - complete class (of strategies);
    полный коэффициент корреляции - total coefficient of correlation;
    полное сопротивление - impedance;
    полное сплетение - complete wreath product;
    полная вариация - total variation;
    полная группа - divisible (Abelian) group;
    полная регулярность - total regularity;
    множество полной меры - set of full measure;
    полное прямое произведение - direct product

    Русско-английский математический словарь > полный

  • 2 полный

    Русско-английский словарь по математике > полный

  • 3 полный прообраз

    Универсальный русско-английский словарь > полный прообраз

  • 4 agencia inmobiliaria

    f.
    real estate agency, realtors, estate agent's, estate agency.
    * * *
    estate agent's, US real estate office
    * * *
    (n.) = real estate brokerage, real estate firm, real estate agent, estate agent, realtor
    Ex. The application of this method in a real estate brokerage is presented and a complete ES prototype is described.
    Ex. Some businesses, such as travel agencies and real estate firms are finding the interactive system attractive.
    Ex. The WWW edition is updated weekly and includes news and sport and advertisements from the printed newspaper such as those for motor cars and real estate agents.
    Ex. The author looks at some of the systems used by UK and US estate agents for marketing properties.
    Ex. 'Client' has overtones of shifty lawyers and overpaid realtors.
    * * *
    (n.) = real estate brokerage, real estate firm, real estate agent, estate agent, realtor

    Ex: The application of this method in a real estate brokerage is presented and a complete ES prototype is described.

    Ex: Some businesses, such as travel agencies and real estate firms are finding the interactive system attractive.
    Ex: The WWW edition is updated weekly and includes news and sport and advertisements from the printed newspaper such as those for motor cars and real estate agents.
    Ex: The author looks at some of the systems used by UK and US estate agents for marketing properties.
    Ex: 'Client' has overtones of shifty lawyers and overpaid realtors.

    * * *
    real estate office, Br
    estate agency

    Spanish-English dictionary > agencia inmobiliaria

  • 5 двигатель



    - (газотурбинный, поршневой, тепловой) — engine
    - (гидравлический, пневматический, электрический) — motor
    -, авиационный — aircraft engine
    двигатель, используемый или предназначенный к использованию в авиации для перемещения и (или) поддержания ла, на котором он установлен, в воздухе (рис. 46). — an engine that is used or intended to be used in propelting or lifting aircraft.
    - аналогичной конструкцииengine of identical design and сonstruction
    - без наддува (ид)unsupercharged engine
    -, безредукторный — direct-drive engine
    -, безредукторный винто-вентиляторный (незакопоченный) — unducted fan engine (udf)
    винтовентиляторы вращаются непосредственно силовой (свободной) турбиной с противоположным вращением рабочих колес. — fans are driven directly by a counter-rotating turbine, eliminating complexity of a reduction gearbox.
    -, бензиновый — gasoline engine
    -, боковой (рис. 13) — side engine
    - в подвесной мотогондолеpod engine
    -, вентиляторный, с противоположным вращением вентиляторов — contrafan engine
    - вертикальной наводки, приводной (стрелкового вооружения) — (gun) elevation drive motor
    -, винто-вентиляторный (тввд) — prop-fan engine
    -, включенный (работающий) — operating/running/engine
    -, внешний (по отношению к фюзеляжу) (рис. 44) — outboard engine
    - внутреннего сгоранияinternal-combustion engine
    -, внутренний (по отношению к наружному двигателю) (рис. 44) — inboard engine
    - воздушного охлаждения (пд)air-cooled engine
    двигатель, у которого отвод тепла от цилиндров производится воздухом, непосредственно обдувающим их. — an engine whose running temperature is controlled by means of air cooled cylinders.
    -, вспомогательный (всу) — auxiliary power unit (apu)
    -, выключенный — shutdown engine
    -, выключенный (неработающий) — inoperative engine
    -, высокооборотный — high-speed engine
    -, высотный — high-altitude engine
    -, газотурбинный (гтд) — turbine engine
    -, газотурбинный (вертолетныи) — helicopter turboshaft engine
    -,газотурбинный-энергоузел (стартер-энергоузел) — turbine-starter - auxiliary power unit, starter - apu
    - (-) генераторmotor-generator
    устройство для преобразования одного вида эл. энергии в другую (напр., переменный ток в постоянный). — а motor-generator combination for converting one kind of electric power to another (e.g. ас to dc)
    - горизонтальной наводки, приводной (стрелкового вооружения) — (gun) azimuth drive motor
    - двухвальной схемы (турбовальный)two-shaft turbine engine
    -, двухвальный турбовинтовой — two-shaft turboprop engine
    -, двухвальный турбореактивный — two-shaft /-rotor, -spool/turbojet engine
    -, двухкаскадный — two-rotor /-shaft, -spool/ engine, twin-spool engine
    двухвальный турбореактивный двигатель называется также двухроторным или двухкаскадным двигателем. — а two-rotor engine is a twoshaft or two-spool engine with lp and hp compressors and hp and lp turbines.
    -, двухкаскадный, двухконтурный, (турбореактивный) — two-rotor /twin-spool/ by-pass turbo-jet engine
    -, двухкаскадный, турбовальный, газотурбинный, со свободной турбиной — two-rotor /twin-spool/ turboshaft engine with free-power turbine
    -, двухкаскадный, турбовентиляторвый с устройством отклонения направления тяги — two-rotor /twin-spool/ turbofan engine with thrust deflector system
    -, двухконтурный — by-pass /bypass/ engine
    гтд, в котором, помимо основного внутреннего (первого) контура, имеется наружный (второй) контур, представляющий собой канал кольцевого сечения, оканчивающийся у реактивного сопла. — in а by-pass engine, a part of the air leaving the lp cornpressor is dueted through the by-pass duct around the engine main duct to the exhaust unit to be exhausted to the atmosphere.
    -, двухконтурный с дожиганиem во втором контуре — duct-burning by-pass engine
    -, двухконтурный со смешиванием потоков наружного и и внутренного контуров — by-pass exhaust mixing engine
    -, двухроторный — two-rotor engine
    - двухрядная звезда (пд)double-row radial engine
    двигатель, у которого цнлиндры расположены двумя рядами радиально относительнo одного oбщего коленчатоro вала. — an engine having two rows of cylinders arranged radially around а common crankshaft. the corresponding front and rear cylinders may or may not be in line.
    -, двухтактный (пд) — two-cycle engine
    -, дозвуковой — subsonic engine
    -, доработанный по модификации (1705) — engine incorporating mod. (1705), post-mod. (1705) engine
    -, звездообразный — radial engine
    поршневой двигатель с радиальным расположением цилиндров, оси которых лежат в одной, двух или нескольких плоскостях, перпендикулярных к оси коленчатого вала — an engine having stationary cylinders arranged radially around а commom crankshaft.
    -, звездообразный двухрядный — double-row radial engine
    -, звездообразный однорядный — single-row radial engine
    -, исполнительный (эл.) — (electric) actuator, servo motor
    -, исполнительный, канала курса (крена или тангажа) (гироплатформы) — azimuth (roll or pitch) servornotor
    -, карбюраторный (пд) — carburetor engine
    -, коррекционный (гироскопического прибора) — erection torque motor
    -, критический — critical engine
    двигатель, отказ которого вызывает наиболее неблагоприятные изменения в поведении самолета, управляемости и избытке тяги. — "critical engineп means the engine whose failure would most adversely affect the performance or handling qualities of an aircraft.
    -, крыльевой (установленный на крыле) — wing engine
    - левого вращенияengine of lh rotation
    -, маломощный — low-powered engine
    -, многорядный (пд) — multirow engine
    -, многорядный звездообразный — multirow radial engine
    -, модифицированный — modified engine
    - модульной конструкцииmodule-construction engine

    lp compressor - module i, hp compressor - module 2, etc.
    -, мощный — high-powered engine
    -, недоработанный no модификацин (1705) — engine not incorporating mod. (1705), pre-mod. (1705) engine
    -, незакапоченный — uncowled engine
    - непосредственного впрыска (пд)fuel injection engine
    -, неработающий — inoperative engine
    -, одновальный (гтд) — single-shaft /single-rotor/ turbine engine
    -, одновальный двухконтурный — single-shaft /single-rotor/ bypass engine
    -, одновальный турбовентиляторный — single-shaft /single-rotor/ turbofan engine
    -, одновальный турбовинтовой — single-shaft turboprop engine
    -, одновальный турбореактивный — single-shaft /single-rotor/turbojet engine
    -, однорядный (пд) — single-row engine
    -, опытный — prototype engine
    двигатель определенного тиna, еще не прошедший типовые государственные испытания. — the tirst engine of a type and arrangement not approved previously, to be submitted for type approval test.
    -, основной — main engine
    -, оставшийся (продолжающий работать) — remaining engine
    -, отказавший — inoperative/failed/ engine
    - отработки (эл., исполнительный) — servomotor
    - отработки следящей системыservo loop drive motor
    - подтяга (патронной ленты)ammunition booster torque motor
    -, поперечный коррекционный (авиагоризонта) — roll erection torque motor
    -, поршневой (пд) — reciprocating engine
    - правого вращенияengine of rh rotation
    -, продольный коррекционный (авиагоризонта) — pitch erection torque motor
    -, прямоточный — ramjet engine
    двигатель без механического компрессора, в котором сжатие воздуха обеспечивается поступательным движением самого двигателя. — а jet engine with no meehanical compressor, and using the air for combustion compressed by forward motion of the engine.
    - работающийoperating engine
    -, работающий с перебоями — rough engine
    двигатель, работающий с неисправной системой зажигания или подачи топлива (рабочей смеси) — an engine that is running or firing unevenly, usually due to а faulty condition in either the fuel or ignition systems.
    - рамы крена (гироплатформыroll-gimbal servomotor
    - рамы курса (гироплатформыazimuth-gimbal servomotor
    - рамы тангажа (гироплатформы)pitch-gimbal servomotor
    -, реактивный — jet-engine
    двигатель, в котором энергия топлива преобразуется в кинетическую энергию газовой струи, вытекающей из двигателя, a получающаяся за счет этого сила реакции нenоcредственно используется как сила тяги для перемещения летательного аппарата. — an aircraft engine that derives all or most of its thrust by reaction to its ejection of combustion products (or heated air) in a jet and that obtains oxygen from the atmosphere for the combustion of its fuel.
    -, реактивный, пульсирующий — pulse jet (engine)
    применяется для непосредственного вращения несущеro винта вертолета. — pulse jets are designed for helicopter rotor propulsion.
    -, ремонтный — overhauled engine
    серийный двигатель, отремонтированный или восстановленный до состояния, удовлетворяющего требованиям серийного стандарта, и пригодный для дальнейшей эксплуатации в течение установленного межремонтного ресурса. — an engine which has been repaired or reconditioned to а standard rendering it eligible for the complete overhaul life agreed by the national authority.
    - с внешним смесеобразованием (пд)carburetor engine
    двигатель внутреннего сгорания, у которого горючая смесь образуется вне рабочего цилиндра. — an engine in which the fuel/air mixture is formed in the carburetor.
    - с внутренним смесеобразованиемfuel-injection engine
    двигатель, у которого горючая смесь образуется внутри рабочего цилиндра. — an engine in which fuel is directly injected into the cylinders.
    - с водяным охлаждением (пд)water-cooled engine
    - с высокой степенью сжатияhigh-compression engine
    - с нагнетателем (пд)supercharged engine
    - с наддувом (пд) с осевым компрессором (пд)supercharged engine axial-flom turbine engine
    - с передним расположением вентилятораfront fan turbine engine
    - с противоточной камерой сгорания (гтд)reverse-flow turbine engine
    - с редукторомengine with reduction gear
    - с форсажной камерой (гтд). двигатель с дополнительным сжиганием топлива в специальной камере за турбиной — engine with afterburner, afterburning engine, reheat(ed) engine, engine with thrust augmentor
    - с форсированной (взлетной) мощностьюengine with augmented (takeoff) power rating
    - с центробежным компрессором (гтд)radial-flow turbine engine
    -, серийный — series engine
    двигатель, изготовляемый в серийном производстве и соответствующий опытному двигателю, принятому при государственных испытаниях для серийного производства. — an engine essentially identiin design, in materials, and in methods of construction, with one which has been approved previously.
    - со свободной турбинойfree-luroine engine
    двигатель с двумя турбинами, валы которых кинематически не связаны. одна из турбин обычно служит для привода компрессора, а другая используется для передачи полезной работы потребителю, например, воздушному (или несущему) винту. — the engine with two turbines whose shafts are not mechanically coupled. one turbine drives the compressor, and the other free turbine drives the propeller or rotor.
    - следящей системы по внутреннему крену (гироплатформы)inner roll gimbal servomotor
    - следящей системы по наружному крену (гироплатформы)outer roll gimbal servomotor
    - следящей системы по курсу (гироплатформы)azimuth gimbal servomotor
    - следящей системы по тангажу (гироплатформы)pitch gimbal servomotor
    -, собственно — engine itself
    -, средний (рис. 44) — center engine
    - стабилизации гироплатформы — stable platform-stabilization servomotor/servo/
    -, стартовый (работающий при взлете) — booster
    -, стартовый твердотопливный — solid propellant booster
    -, трехкаскадный, турбореактивный, с передним вентилятором — three-rotor /triple-spool, triple shaft/ front fan turbo-jet engine
    -, турбовентиляторный — turbofan engine
    двухконтурный турбореактивный двигатель, в котором часть воздуха выбрасывается за первыми ступенями компрессора низкого давления, а остальная часть воздуха за кнд поступает в основной контур с камерами сгорания. — in the turbofan engine a part of the air bypassed and exhausted to atmosphere after the first (two) stages of lp compressor. about half of the thrust is produced by the fan exhaust.
    -, турбовентиляторный (с дожиганием в вентиляторном контуре) — duct-burning turbofan engine
    -, турбовинтовентиляторный — (turbo) propfan engine, unducted fan engine (ufe)
    -, турбовинтовой (твд) — turboprop engine
    газотурбинный двигатель, в котором тепло превращается в кинетическую энергию реактивной струи и в механическую работу на валу двигателя, которая используется для вращения воздушного винта. — а turboprop engine is a turbine engine driving the propeller and developing an additional propulsive thrust by reaction to ejection of combustion products.
    -, "турбовинтовой" (вертолетный, с отбором мощности на вал) — turboshaft engine
    -, турбовинтовой, с толкающим винтом — pusher-turboprop engine
    -, турбопрямоточный — turbo/ram jet engine
    комбинация из турбореактивного (до м-з) и прямоточного (для больших чисел м). — combines а turbo-jet engine (for speeds up to mach 3) and ram jet engine for higher mach numbers.
    -,турбо-ракетный — turbo-rocket engine
    аналог турбопрямоточному двигателю с автономным кислородным питанием, — а turbo/ram jet engine with its own oxygen to provide combustion.
    -, турбореактивный — turbojet engine
    газотурбинный двигатель (с приводом компрессора от турбин), в котором тепло превращается только в кинетическую энергию реактивной струи. — a jet engine incorporating a turbine-driven air compressor to take in and compress the air for the combustion of fuel, the gases of combustion being used both to rotate the turbine and to create a thrust-producing jet.
    -, установленный в мотогондоле — nacelle-mounted engine
    -, установленный в подвесной мотогондоле — pod engine
    -, четырехтактный (поршневой — four-cycle engine
    за два оборота коленчатого вала происходит четыре хода поршня в каждом цилиндре, по одному такту на ход. такт 1 - впуск всасывание рабочей смеси в цилиндр), такт 2 - матке рабочей смеси, такт 3 - рабочий ход (зажигание смеси), такт 4 - выхлоп (выпуск отработанных газов из цилиндра в атмосферу) — a common type of engine which requires two revolutions of the crankshaft (four strokes of the piston) to complete the four events of (1) admission of or forcing the charged mixture of combustible gas into the cylinder, (2) compression of the charge, (3) ignition and burning of the charge, which develops pressure (power) acting on the piston and (4) exhaust or expulsion of the charge from the cylinder.
    -, шаговой (эл.) — step-servo motor
    -, электрический — electric motor
    устройство, преобразующее электрическую энергию во вращательное механическое движение. — device which converts electrical energy into rotating mechanical energy.
    - (-) энергоузел, газотурбинный (ггдэ) — turbine starter /auxiliary power unit, starter/ apu
    для запуска основн. двигателей, хол. прокрутки (стартерный режим) и привода агрегатов самолета при неработающих двигателях (режим энергоузла), имеет свой электростартер.
    в зоне д. — in the region of the engine
    выбег д. — engine run-down
    гонка д. — engine run
    данные д. — engine data
    заливка д. (пд перед запуском) — engine priming
    замена д. — engine replacement /change/
    запуск д. — engine start
    испытание д. — engine test
    мощность д. — engine power
    на входе в д. — at /in/ inlet to the engine
    обороты д. — engine speed /rpm, rpm/
    опробование д. — engine ground test
    опробование д. в полете — in-flight engine test
    опробование д. на земле — engine ground test
    останов д. (выключение) — engine shutdown
    остановка д. (отказ) — engine failure
    остановка д. (выбег) — run down
    остановка д. вслествие недостатка масла (топлива) — engine failure due to oil (fuel) starvation
    отказ д. — engine failure
    перебои в работе д. — rough engine operation
    подогрев д. — engine heating
    проба д. (на земле) — engine ground test
    прогрев д. — engine warm-up
    прокрутка д. (холодная) — engine cranking /motoring/
    работа д. — engine operation
    разгон д. — engine acceleration
    стоянка д. (период, в течение которого двигатель не работает) — engine shutdown. one hundred starts must be made of which 25 starts must be preceded by at least a two-hour engine shutdown.
    тряска д. — engine vibration
    тяга д. — engine thrust
    установка д. — engine installation
    шум д. — engine noise
    вывешивать д. с помощью лебедки — support weight of the engine by a hoist
    выводить д. на требуемые обороты % — accelerate the engine to a required speed of %
    выключать д. — shut down the engine
    глушить д. — shut down the engine
    гонять д. — run the engine
    заливать д. (пд) — prim the engine
    заменять д. — replace the engine
    запускать д. — start the engine
    запускать д. в воздухе — (re)start the engine
    испытывать д. — test the engine
    опробовать д. на земле — ground test the engine
    останавливать д. — shut down the engine
    подвешивать д. — mount the engine
    поднимать д. подъемником — hoist the engine
    подогревать д. — heat the engine
    проворачивать д. на... оборотов — turn the engine... revolutions
    прогревать д. (на оборотах...%) — warm up the engine (at a speed of... %)
    продопжать полет на (двух) д. — continue flight on (two) engines
    разгоняться на одном д. — accelerate with one engine operating
    разгоняться при неработающем критическом д. — accelerate with the critical епgine inoperative
    сбавлять (убирать) обороты (работающего) д. — decelerate the engine
    увеличивать обороты (работающего) д. — accelerate the engine
    устанавливать д. — install the engine

    Русско-английский сборник авиационно-технических терминов > двигатель

  • 6 середина

    Середина (1979 года)-- The availability of engineering prototype hardware is scheduled for mid-1979. Серия - series, set; line (изделий); succession, sequence (последовательная)
     The indirect-transfer theory will be used to construct a set of nondimensional parametric curves.
     ANKER-HOLTH offers a complete line of standard hydraulic and pneumatic cylinders up to 20 bore.

    Русско-английский научно-технический словарь переводчика > середина

  • 7 Stephenson, Robert

    [br]
    b. 16 October 1803 Willington Quay, Northumberland, England
    d. 12 October 1859 London, England
    [br]
    English engineer who built the locomotive Rocket and constructed many important early trunk railways.
    [br]
    Robert Stephenson's father was George Stephenson, who ensured that his son was educated to obtain the theoretical knowledge he lacked himself. In 1821 Robert Stephenson assisted his father in his survey of the Stockton \& Darlington Railway and in 1822 he assisted William James in the first survey of the Liverpool \& Manchester Railway. He then went to Edinburgh University for six months, and the following year Robert Stephenson \& Co. was named after him as Managing Partner when it was formed by himself, his father and others. The firm was to build stationary engines, locomotives and railway rolling stock; in its early years it also built paper-making machinery and did general engineering.
    In 1824, however, Robert Stephenson accepted, perhaps in reaction to an excess of parental control, an invitation by a group of London speculators called the Colombian Mining Association to lead an expedition to South America to use steam power to reopen gold and silver mines. He subsequently visited North America before returning to England in 1827 to rejoin his father as an equal and again take charge of Robert Stephenson \& Co. There he set about altering the design of steam locomotives to improve both their riding and their steam-generating capacity. Lancashire Witch, completed in July 1828, was the first locomotive mounted on steel springs and had twin furnace tubes through the boiler to produce a large heating surface. Later that year Robert Stephenson \& Co. supplied the Stockton \& Darlington Railway with a wagon, mounted for the first time on springs and with outside bearings. It was to be the prototype of the standard British railway wagon. Between April and September 1829 Robert Stephenson built, not without difficulty, a multi-tubular boiler, as suggested by Henry Booth to George Stephenson, and incorporated it into the locomotive Rocket which the three men entered in the Liverpool \& Manchester Railway's Rainhill Trials in October. Rocket, was outstandingly successful and demonstrated that the long-distance steam railway was practicable.
    Robert Stephenson continued to develop the locomotive. Northumbrian, built in 1830, had for the first time, a smokebox at the front of the boiler and also the firebox built integrally with the rear of the boiler. Then in Planet, built later the same year, he adopted a layout for the working parts used earlier by steam road-coach pioneer Goldsworthy Gurney, placing the cylinders, for the first time, in a nearly horizontal position beneath the smokebox, with the connecting rods driving a cranked axle. He had evolved the definitive form for the steam locomotive.
    Also in 1830, Robert Stephenson surveyed the London \& Birmingham Railway, which was authorized by Act of Parliament in 1833. Stephenson became Engineer for construction of the 112-mile (180 km) railway, probably at that date the greatest task ever undertaken in of civil engineering. In this he was greatly assisted by G.P.Bidder, who as a child prodigy had been known as "The Calculating Boy", and the two men were to be associated in many subsequent projects. On the London \& Birmingham Railway there were long and deep cuttings to be excavated and difficult tunnels to be bored, notoriously at Kilsby. The line was opened in 1838.
    In 1837 Stephenson provided facilities for W.F. Cooke to make an experimental electrictelegraph installation at London Euston. The directors of the London \& Birmingham Railway company, however, did not accept his recommendation that they should adopt the electric telegraph and it was left to I.K. Brunel to instigate the first permanent installation, alongside the Great Western Railway. After Cooke formed the Electric Telegraph Company, Stephenson became a shareholder and was Chairman during 1857–8.
    Earlier, in the 1830s, Robert Stephenson assisted his father in advising on railways in Belgium and came to be increasingly in demand as a consultant. In 1840, however, he was almost ruined financially as a result of the collapse of the Stanhope \& Tyne Rail Road; in return for acting as Engineer-in-Chief he had unwisely accepted shares, with unlimited liability, instead of a fee.
    During the late 1840s Stephenson's greatest achievements were the design and construction of four great bridges, as part of railways for which he was responsible. The High Level Bridge over the Tyne at Newcastle and the Royal Border Bridge over the Tweed at Berwick were the links needed to complete the East Coast Route from London to Scotland. For the Chester \& Holyhead Railway to cross the Menai Strait, a bridge with spans as long-as 460 ft (140 m) was needed: Stephenson designed them as wrought-iron tubes of rectangular cross-section, through which the trains would pass, and eventually joined the spans together into a tube 1,511 ft (460 m) long from shore to shore. Extensive testing was done beforehand by shipbuilder William Fairbairn to prove the method, and as a preliminary it was first used for a 400 ft (122 m) span bridge at Conway.
    In 1847 Robert Stephenson was elected MP for Whitby, a position he held until his death, and he was one of the exhibition commissioners for the Great Exhibition of 1851. In the early 1850s he was Engineer-in-Chief for the Norwegian Trunk Railway, the first railway in Norway, and he also built the Alexandria \& Cairo Railway, the first railway in Africa. This included two tubular bridges with the railway running on top of the tubes. The railway was extended to Suez in 1858 and for several years provided a link in the route from Britain to India, until superseded by the Suez Canal, which Stephenson had opposed in Parliament. The greatest of all his tubular bridges was the Victoria Bridge across the River St Lawrence at Montreal: after inspecting the site in 1852 he was appointed Engineer-in-Chief for the bridge, which was 1 1/2 miles (2 km) long and was designed in his London offices. Sadly he, like Brunel, died young from self-imposed overwork, before the bridge was completed in 1859.
    [br]
    Principal Honours and Distinctions
    FRS 1849. President, Institution of Mechanical Engineers 1849. President, Institution of Civil Engineers 1856. Order of St Olaf (Norway). Order of Leopold (Belgium). Like his father, Robert Stephenson refused a knighthood.
    Further Reading
    L.T.C.Rolt, 1960, George and Robert Stephenson, London: Longman (a good modern biography).
    J.C.Jeaffreson, 1864, The Life of Robert Stephenson, London: Longman (the standard nine-teenth-century biography).
    M.R.Bailey, 1979, "Robert Stephenson \& Co. 1823–1829", Transactions of the Newcomen Society 50 (provides details of the early products of that company).
    J.Kieve, 1973, The Electric Telegraph, Newton Abbot: David \& Charles.
    PJGR

    Biographical history of technology > Stephenson, Robert

  • 8 Tesla, Nikola

    SUBJECT AREA: Electricity
    [br]
    b. 9 July 1856 Smiljan, Croatia
    d. 7 January 1943 New York, USA
    [br]
    Serbian (naturalized American) engineer and inventor of polyphase electrical power systems.
    [br]
    While at the technical institute in Graz, Austria, Tesla's attention was drawn to the desirability of constructing a motor without a commutator. He considered the sparking between the commutator and brushes of the Gramme machine when run as a motor a serious defect. In 1881 he went to Budapest to work on the telegraph system and while there conceived the principle of the rotating magnetic field, upon which all polyphase induction motors are based. In 1882 Tesla moved to Paris and joined the Continental Edison Company. After building a prototype of his motor he emigrated to the United States in 1884, becoming an American citizen in 1889. He left Edison and founded an independent concern, the Tesla Electric Company, to develop his inventions.
    The importance of Tesla's first patents, granted in 1888 for alternating-current machines, cannot be over-emphasized. They covered a complete polyphase system including an alternator and induction motor. Other patents included the polyphase transformer, synchronous motor and the star connection of three-phase machines. These were to become the basis of the whole of the modern electric power industry. The Westinghouse company purchased the patents and marketed Tesla motors, obtaining in 1893 the contract for the Niagara Falls two-phase alternators driven by 5,000 hp (3,700 kW) water turbines.
    After a short period with Westinghouse, Tesla resigned to continue his research into high-frequency and high-voltage phenomena using the Tesla coil, an air-cored transformer. He lectured in America and Europe on his high-frequency devices, enjoying a considerable international reputation. The name "tesla" has been given to the SI unit of magnetic-flux density. The induction motor became one of the greatest advances in the industrial application of electricity. A claim for priority of invention of the induction motor was made by protagonists of Galileo Ferraris (1847–1897), whose discovery of rotating magnetic fields produced by alternating currents was made independently of Tesla's. Ferraris demonstrated the phenomenon but neglected its exploitation to produce a practical motor. Tesla himself failed to reap more than a small return on his work and later became more interested in scientific achievement than commercial success, with his patents being infringed on a wide scale.
    [br]
    Principal Honours and Distinctions
    American Institute of Electrical Engineers Edison Medal 1917. Tesla received doctorates from fourteen universities.
    Bibliography
    1 May 1888, American patent no. 381,968 (initial patent for the three-phase induction motor).
    1956, Nikola Tesla, 1856–1943, Lectures, Patents, Articles, ed. L.I.Anderson, Belgrade (selected works, in English).
    1977, My Inventions, repub. Zagreb (autobiography).
    Further Reading
    M.Cheney, 1981, Tesla: Man Out of Time, New Jersey (a full biography). C.Mackechnie Jarvis, 1969, in IEE Electronics and Power 15:436–40 (a brief treatment).
    T.C.Martin, 1894, The Inventions, Researches and Writings of Nikola Tesla, New York (covers his early work on polyphase systems).
    GW

    Biographical history of technology > Tesla, Nikola

  • 9 Westinghouse, George

    [br]
    b. 6 October 1846 Central Bridge, New York, USA
    d. 12 March 1914 New York, New York, USA
    [br]
    American inventor and entrepreneur, pioneer of air brakes for railways and alternating-current distribution of electricity.
    [br]
    George Westinghouse's father was an ingenious manufacturer of agricultural implements; the son, after a spell in the Union Army during the Civil War, and subsequently in the Navy as an engineer, went to work for his father. He invented a rotary steam engine, which proved impracticable; a rerailing device for railway rolling stock in 1865; and a cast-steel frog for railway points, with longer life than the cast-iron frogs then used, in 1868–9. During the same period Westinghouse, like many other inventors, was considering how best to meet the evident need for a continuous brake for trains, i.e. one by which the driver could apply the brakes on all vehicles in a train simultaneously instead of relying on brakesmen on individual vehicles. By chance he encountered a magazine article about the construction of the Mont Cenis Tunnel, with a description of the pneumatic tools invented for it, and from this it occurred to him that compressed air might be used to operate the brakes along a train.
    The first prototype was ready in 1869 and the Westinghouse Air Brake Company was set up to manufacture it. However, despite impressive demonstration of the brake's powers when it saved the test train from otherwise certain collision with a horse-drawn dray on a level crossing, railways were at first slow to adopt it. Then in 1872 Westinghouse added to it the triple valve, which enabled the train pipe to charge reservoirs beneath each vehicle, from which the compressed air would apply the brakes when pressure in the train pipe was reduced. This meant that the brake was now automatic: if a train became divided, the brakes on both parts would be applied. From then on, more and more American railways adopted the Westinghouse brake and the Railroad Safety Appliance Act of 1893 made air brakes compulsory in the USA. Air brakes were also adopted in most other parts of the world, although only a minority of British railway companies took them up, the remainder, with insular reluctance, preferring the less effective vacuum brake.
    From 1880 Westinghouse was purchasing patents relating to means of interlocking railway signals and points; he combined them with his own inventions to produce a complete signalling system. The first really practical power signalling scheme, installed in the USA by Westinghouse in 1884, was operated pneumatically, but the development of railway signalling required an awareness of the powers of electricity, and it was probably this that first led Westinghouse to become interested in electrical processes and inventions. The Westinghouse Electric Company was formed in 1886: it pioneered the use of electricity distribution systems using high-voltage single-phase alternating current, which it developed from European practice. Initially this was violently opposed by established operators of direct-current distribution systems, but eventually the use of alternating current became widespread.
    [br]
    Principal Honours and Distinctions
    Légion d'honneur. Order of the Crown of Italy. Order of Leopold.
    Bibliography
    Westinghouse took out some 400 patents over forty-eight years.
    Further Reading
    H.G.Prout, 1922, A Life of "George Westinghouse", London (biography inclined towards technicalities).
    F.E.Leupp, 1918, George Westinghouse: His Life and Achievements, Boston (London 1919) (biography inclined towards Westinghouse and his career).
    J.F.Stover, 1961, American Railroads, Chicago: University of Chicago Press, pp. 152–4.
    PJGR

    Biographical history of technology > Westinghouse, George

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