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1 optical astronomy
[ˌɒptɪk(ə)lə'strɒnəmɪ]Engineering: OA -
2 National Optical Astronomy Observatories
Abbreviation: NOAOУниверсальный русско-английский словарь > National Optical Astronomy Observatories
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3 National Optical Astronomy Observatory
Универсальный русско-английский словарь > National Optical Astronomy Observatory
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4 Bio Optical Organized Knowledge
Astronomy: BOOKУниверсальный русско-английский словарь > Bio Optical Organized Knowledge
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5 оптическая астрономия
Русско-английский физический словарь > оптическая астрономия
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6 астрономия
astronomy@авиационная астрономияaviation astronomy@баллонная астрономияballoon astronomy@визуальная астрономия астрономияvisual astronomy@галактическая радиоастрономияgalactic radioastronomy@гамма- астрономияgamma-ray astronomy@геодезическая астрономияgeodetic astronomy@дотелескопическая астрономияpretelescopic astronomy@звездная астрономия1.stellar astronomy 2.astromechanics@инфракрасная астрономияinfrared astronomy@классическая астрономияclassical astronomy@космическая астрономияspace astronomy@космическая радиоастрономияcosmic radioastronomy@любительская астрономияamateur astronomy@меридианная астрономияmeridian astronomy@метеорная астрономияmeteoric(al) astronomy@метеорная радиоастрономияmeteoric radioastronomy@мореходная астрономияnautical astronomy@наблюдательная астрономияobservational astronomy@наземная астрономияground-based astronomy@общая астрономияgeneral astronomy@описательная астрономияdescriptive astronomy@оптическая астрономия1.optical astronomy 2.convertional astronomy@планетная астрономияplanetary astronomy@позиционная астрономияposition astronomy@полевая астрономия @практическая астрономияpractical astronomy@радиоастрономияradioastronomy@радиолокационная астрономияradar astronomy@ракетная астрономияrocket astronomy@рентгеновская астрономияX-ray astronomy@современная астрономия1. modern astronomy 2.pre-sent-day astronomy@спутниковая астрономияsatellite astronomy@сферическая астрономияspherical astronomy@телевизионная астрономияtelevision astronomy@телескопическая астрономияtelescopic astronomy@теоретическая астрономияtheoretical astronomy@ультрафиолетовая астрономияultraviolet astronomy@фундаментальная астрономияfundamental astronomy@эфемеридная астрономияephemerical astronomy@ -
7 астрономия
* * *астроно́мия ж.
astronomyавиацио́нная астроно́мия — aviation astronomyвнеатмосфе́рная астроно́мия — extra-terrestrial astronomyвнегалакти́ческая астроно́мия — extra-galactical astronomyгалакти́ческая астроно́мия — stellar astronomyгеодези́ческая астроно́мия — field astronomyзвё́здная астроно́мия — stellar astronomyкосми́ческая астроно́мия — space astronomyла́зерная астроно́мия — laser astronomyморехо́дная астроно́мия — nautical astronomyнаблюда́тельная астроно́мия — observational astronomyнейтри́нная астроно́мия — neutrino astronomyопти́ческая астроно́мия — optical astronomyполева́я астроно́мия — field astronomyпракти́ческая астроно́мия — practical astronomyрадиолокацио́нная астроно́мия — radar astronomyрентге́новская астроно́мия — X-ray astronomyсфери́ческая астроно́мия — spherical astronomyтеорети́ческая астроно́мия — theoretical astronomy -
8 астрономия
ж. astronomy -
9 Национальная оптическая астрономическая обсерватория
Astronautics: National Optical Astronomy Observatory( USA)Универсальный русско-английский словарь > Национальная оптическая астрономическая обсерватория
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10 национальная оптическая астрономическая обсерватория
Astronautics: National Optical Astronomy Observatory( USA)Универсальный русско-английский словарь > национальная оптическая астрономическая обсерватория
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11 оптическая астрономия
General subject: optical astronomyУниверсальный русско-английский словарь > оптическая астрономия
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12 оптическая наблюдаемая галактика
Astronomy: optical galaxyУниверсальный русско-английский словарь > оптическая наблюдаемая галактика
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13 оптически наблюдаемая галактика
Astronomy: optical galaxyУниверсальный русско-английский словарь > оптически наблюдаемая галактика
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14 Townes, Charles Hard
SUBJECT AREA: Electronics and information technology[br]b. 28 July 1915 Greenville, South Carolina, USA[br]American physicist who developed the maser and contributed to the development of the laser.[br]Charles H.Townes entered Furman University, Greenville, at the early age of 16 and in 1935 obtained a BA in modern languages and a BS in physics. After a year of postgraduate study at Duke University, he received a master's degree in physics in 1936. He then went on to the California Institute of Technology, where he obtained a PhD in 1939. From 1939 to 1947 he worked at the Bell Telephone Laboratories, mainly on airborne radar, although he also did some work on radio astronomy. In 1948 he joined Columbia University as Associate Professor of Physics and in 1950 was appointed a full professor. He was Director of the University's Radiation Laboratory from 1950 to 1952, and from 1952 to 1955 he was Chairman of the Physics Department.To meet the need for an oscillator generating very short wavelength electromagnetic radiation, Townes in 1951 realized that use could be made of the different natural energy levels of atoms and molecules. The practical application of this idea was achieved in his laboratory in 1953 using ammonia gas to make the device known as a maser (an acronym of microwave amplification by stimulated emission of radiation). The maser was developed in the next few years and in 1958, in a joint paper with his brother-in-law Arthur L. Schawlow, Townes suggested the possibility of a further development into optical frequencies or an optical maser, later known as a laser (an acronym of light amplification by stimulated emission of radiation). Two years later the first such device was made by Theodore H. Maiman.In 1959 Townes was given leave from Columbia University to serve as Vice-President and Director of Research at the Institute for Defense Analyses until 1961. He was then appointed Provost and Professor of Physics at the Massachusetts Institute of Technology. In 1967 he became University Professor of Physics at the University of California, where he has extended his research interests in the field of microwave and infra-red astronomy. He is a member of the National Academy of Sciences, the Institute of Electrical and Electronics Engineers and the American Astronomical Society.[br]Principal Honours and DistinctionsNobel Prize for Physics 1964. Foreign Member, Royal Society of London. President, American Physical Society 1967. Townes has received many awards from American and other scientific societies and institutions and honorary degrees from more than twenty universities.BibliographyTownes is the author of many scientific papers and, with Arthur L.Schawlow, ofMicrowave Spectroscopy (1955).1980, entry, McGraw-Hill Modern Scientists and Engineers, Part 3, New York, pp. 227– 8 (autobiography).1991, entry, The Nobel Century, London, p. 106 (autobiography).Further ReadingT.Wasson (ed.), 1987, Nobel Prize Winners, New York, pp. 1,071–3 (contains a short biography).RTS -
15 метод
1.method 2.techniqueметоды астрономииtechniques of astronomyметоды астрономических исследованийastronomical techniquesметод Аргеландерасм. метод ступенейметод Весселинка при определении радиуса переменной звездыWesselink analysisметод возмущенийperturbation methodметод ‘глаз – ухо’eye-and-ear methodметод зависимостейmethod of dependencesметод затменных наблюденийeclipse techniqueметод наблюденийobservational methodметод ножа Фукосм. теневой методметоды обработки данных наблюденийtechniques of data processingметод определения спектральных классов звездclassification methodметод отклонений{ (ненулевой)deflection methodметоды приближенных вычисленийapproximation techniqueметод пробcut-and-try methodметод прямого визуального наблюденияdirect-vision methodметод регистрации звездных прохожденийmethod of recordingметод серого клинаgrey-wedge techniqueметод сравненияcomparison methodметод ступенейstep method (in visual photometry)метод ТалкоттаTalcott method (of latitude determination)метод Тернерасм. метод шести постоянныхметод фотоэмульсийemulsion techniqueметод шести постоянныхамт. six-constant methodметод Шустера-ШварцшильдаShuster – Schwarzschild methodабсолютный методabsolute methodастрономические методыastronomical methodsгрубый методcrude methodдифференциальный методdifferential methodколичественный метод определения спектральных классов звездquantitative classification methodкомпенсационный методbalanced methodнеточный методinexact methodнулевой метод1.balanced method 2.null methodоптические методыoptical techniquesпрямой методdirect methodрадиоастрономический методradio astronomy methodсложный методelaborate methodспектрографический методspectrographic methodспектроскопический методspectroscopic methodстатистические методыstatistical methodsсуточный методdiurnal methodтеневой методопт. 1.knife-edge analysis 2.shadow methodточный методexact methodтриангуляционный методгеод. triangulation methodфотографический методphotographic methodфотометрический методphotometric methodфотоэлектрический методphotoelectric methodцифровой методdigital methodчисленный методnumerical method -
16 introducir
v.1 to put in, to insert (meter) (llave, carta).introduzca su número secreto enter your PIN number2 to bring in, to introduce.una banda que introduce droga en el país a gang smuggling drugs into the countryElla introdujo la madera She introduced=inserted the wood.Ella introdujo a la nueva secretaria She introduced the new secretary.Ella introdujo la nueva técnica She introduced the new technique.Ella introdujo su nuevo producto She introduced her new product.Ella introdujo al plomero She introduced=ushered in the plumber.3 to enter, to type in.El chico introdujo los datos The boy entered=typed in the data.4 to slip in.5 to be inserted in, to be introduced in.Se te introduce una aguja A needle is inserted in you.* * *2 (meter) to put, place; (insertar) insert■ el domador introduce su cabeza en las fauces del león the lion tamer puts his head in the lion's mouth3 (importar) to bring in, import; (clandestinamente) to smuggle in1 (entrar) to go in, get in, enter\introducir modificaciones/novedades/cambios en algo to modify something, make changes to something* * *verb1) to introduce2) insert3) input, insert* * *1. VT1) (=meter)a) [+ mano, pie] to put, place (en in(to))[+ moneda, llave] to put, insert (en in(to))introdujo los pies en el agua — he put o placed his feet in(to) the water
introduzca la moneda/el disquete en la ranura — insert the coin/the diskette in(to) the slot
b) [+ enfermedad, mercancías] to bring (en into)introduce (en into) [+ contrabando, droga] to bring (en in(to))cualquier animal puede introducir la rabia en el país — any animal could bring o introduce rabies into the country
esa bebida hace ya años que se introdujo en España — that drink was introduced in Spain o was brought onto the Spanish market years ago
introducir algo en el mercado — to bring sth onto the market, introduce sth into the market
c)introducir a algn en — [+ habitación] to show sb into; [+ situación real] to introduce sb to; [+ situación irreal] to transport sb to
la novela nos introduce en el Egipto de Cleopatra — the novel takes us back to the Egypt of Cleopatra
2) (=empezar) [+ cultivo, ley, método] to introducepoco a poco se fueron introduciendo las tradiciones árabes — Arab traditions were gradually introduced
para introducir el tema, empezaré hablando de política exterior — to introduce the subject, I'll begin by discussing foreign policy
introducir la ley del divorcio causó muchos problemas — the introduction of the divorce law caused many problems, introducing the divorce law was very problematic
3) (=realizar) [+ medidas, reformas] to bring in, introducequieren introducir cambios en la legislación — they want to make changes to the current legislation, they want to introduce changes into the current legislation
las reformas se introducirán gradualmente a lo largo de los próximos tres años — the reforms will be phased in over the next three years, the reforms will be brought in o introduced gradually over the next three years
se deben introducir mejoras en el diseño del folleto — improvements need to be made to the pamphlet design
4) (Inform) [+ datos] to input, enter2.See:* * *1.verbo transitivo1) <llave/moneda> to insertintrodujo la papeleta en la urna — he put his ballot paper in o into the ballot box
2)a) <cambios/medidas/ley> to introduce, bring inintroducir un nuevo producto en el mercado — to introduce a new product into o bring a new product onto the market
b) <contrabando/drogas> to bring in, smuggle inun solo perro podría introducir la enfermedad en el país — a single dog could bring o introduce the disease into the country
3)a) (presentar, iniciar) to introduceb) < persona> ( a una actividad)c) ( en un ambiente)2.el escritor nos introduce en la Francia del siglo pasado — the writer takes us back to the France of the last century
introducirse v prona) ( meterse)b) persona to gain access tose introdujeron en el banco por un túnel — they gained access to o got into the bank via a tunnel
c) ( entrar en uso) modato come ind) ( hacerse conocido) to become known* * *= enter, feed, input, insert, introduce, key in, load into, put in, put into, read in, usher in, inaugurate, carry in, slip in between, roll out.Ex. Entry of an 'e' for end will bring back the screen shown in Figure 23 where you can make another choice or enter 'e' for end.Ex. The computer merely needs to be fed with the source documents and their citation, and with the appropriate software, will generate the indexes.Ex. Thus the electronic journal (e-journal) is a concept where scientists are able to input ideas and text to a computer data base for their colleagues to view, and similarly to view the work of others.Ex. Gaps are left in the apportionment of notation in order to permit new subjects to be inserted.Ex. The report introduced a range of ideas which have influenced subsequent code construction.Ex. The advantage is that information does not have to be keyed in.Ex. Multiple copies of the catalogue or index in the conventional sense are not required, but the data base can be copied and loaded into various computer systems.Ex. For those of you who are not familiar with OCLC and the way we work the data base is not a vast receptacle into which we throw any kind of record that anybody wants to put in.Ex. If the bibliographic record is found, it can be put into the system catalog immediately.Ex. Light pens can be used to read in data from bar codes on borrowers' cards, books, records, audio-visual materials.Ex. Optical technology has ushered in a new phase in the storage and retrieval of information.Ex. In the beginning staff delivered books to readers in their homes, while in 1972 a mobile library service was inaugurated enabling readers to choose their own materials.Ex. The first printing presses had two moving parts: the carriage assembly, which carried the type and paper in and out of the press, and the impression assembly, by means of which the paper was pressed down on to the inked type.Ex. At all periods, but uncommonly before the eighteenth century, the lines of type might be 'leaded', thin strips of typemetal, reglet, or card being slipped in between each one.Ex. I don't need to tell those of you from higher education institutions how course management systems are starting to really proliferate and roll out in higher education.----* introducir a golpes = hammer into.* introducir Algo/Alguien en = usher + Nombre + into.* introducir Algo en = take + Nombre + into.* introducir arrastrando = haul in.* introducir datos = key + data.* introducir datos en el ordenador = input.* introducir datos partiendo de cero = enter from + scratch.* introducir de contrabando = smuggle in.* introducir de nuevo = re-enter [reenter].* introducir en = merge into.* introducir escalonadamente = spiral.* introducir gradualmente = phase in.* introducir ilegalmente = smuggle in.* introducir información = provide + input.* introducir mediante el teclado = keyboard.* introducir mejoras = make + improvements.* introducir poco a poco a = filter through to.* introducir por primera vez = pioneer.* introducir progresivamente = spiral.* introducirse = creep (up) (in/into), enter into, make + Posesivo + way (into/onto).* introducirse completamente en = immerse + Reflexivo + in.* introducirse en = insinuate + Posesivo + way through, insinuate + Reflexivo + (into), insinuate into.* introducirse poco a poco = ease + Reflexivo + in.* introducirse sigilosamente = creep up on.* introducir tirando = haul in.* introducir un cambio = bring + change.* volver a introducir = re-enter [reenter], reintroduce, reinsert.* * *1.verbo transitivo1) <llave/moneda> to insertintrodujo la papeleta en la urna — he put his ballot paper in o into the ballot box
2)a) <cambios/medidas/ley> to introduce, bring inintroducir un nuevo producto en el mercado — to introduce a new product into o bring a new product onto the market
b) <contrabando/drogas> to bring in, smuggle inun solo perro podría introducir la enfermedad en el país — a single dog could bring o introduce the disease into the country
3)a) (presentar, iniciar) to introduceb) < persona> ( a una actividad)c) ( en un ambiente)2.el escritor nos introduce en la Francia del siglo pasado — the writer takes us back to the France of the last century
introducirse v prona) ( meterse)b) persona to gain access tose introdujeron en el banco por un túnel — they gained access to o got into the bank via a tunnel
c) ( entrar en uso) modato come ind) ( hacerse conocido) to become known* * *= enter, feed, input, insert, introduce, key in, load into, put in, put into, read in, usher in, inaugurate, carry in, slip in between, roll out.Ex: Entry of an 'e' for end will bring back the screen shown in Figure 23 where you can make another choice or enter 'e' for end.
Ex: The computer merely needs to be fed with the source documents and their citation, and with the appropriate software, will generate the indexes.Ex: Thus the electronic journal (e-journal) is a concept where scientists are able to input ideas and text to a computer data base for their colleagues to view, and similarly to view the work of others.Ex: Gaps are left in the apportionment of notation in order to permit new subjects to be inserted.Ex: The report introduced a range of ideas which have influenced subsequent code construction.Ex: The advantage is that information does not have to be keyed in.Ex: Multiple copies of the catalogue or index in the conventional sense are not required, but the data base can be copied and loaded into various computer systems.Ex: For those of you who are not familiar with OCLC and the way we work the data base is not a vast receptacle into which we throw any kind of record that anybody wants to put in.Ex: If the bibliographic record is found, it can be put into the system catalog immediately.Ex: Light pens can be used to read in data from bar codes on borrowers' cards, books, records, audio-visual materials.Ex: Optical technology has ushered in a new phase in the storage and retrieval of information.Ex: In the beginning staff delivered books to readers in their homes, while in 1972 a mobile library service was inaugurated enabling readers to choose their own materials.Ex: The first printing presses had two moving parts: the carriage assembly, which carried the type and paper in and out of the press, and the impression assembly, by means of which the paper was pressed down on to the inked type.Ex: At all periods, but uncommonly before the eighteenth century, the lines of type might be 'leaded', thin strips of typemetal, reglet, or card being slipped in between each one.Ex: I don't need to tell those of you from higher education institutions how course management systems are starting to really proliferate and roll out in higher education.* introducir a golpes = hammer into.* introducir Algo/Alguien en = usher + Nombre + into.* introducir Algo en = take + Nombre + into.* introducir arrastrando = haul in.* introducir datos = key + data.* introducir datos en el ordenador = input.* introducir datos partiendo de cero = enter from + scratch.* introducir de contrabando = smuggle in.* introducir de nuevo = re-enter [reenter].* introducir en = merge into.* introducir escalonadamente = spiral.* introducir gradualmente = phase in.* introducir ilegalmente = smuggle in.* introducir información = provide + input.* introducir mediante el teclado = keyboard.* introducir mejoras = make + improvements.* introducir poco a poco a = filter through to.* introducir por primera vez = pioneer.* introducir progresivamente = spiral.* introducirse = creep (up) (in/into), enter into, make + Posesivo + way (into/onto).* introducirse completamente en = immerse + Reflexivo + in.* introducirse en = insinuate + Posesivo + way through, insinuate + Reflexivo + (into), insinuate into.* introducirse poco a poco = ease + Reflexivo + in.* introducirse sigilosamente = creep up on.* introducir tirando = haul in.* introducir un cambio = bring + change.* volver a introducir = re-enter [reenter], reintroduce, reinsert.* * *introducir [I6 ]vtA (meter) introducir algo EN algo:introdujo la papeleta en la urna he put his ballot paper in o into the ballot box, he placed his ballot paper in the ballot boxintroducir la moneda en la ranura insert the coin in the slotintrodujo la llave en la cerradura he put o inserted the key in o into the lockintroducir un cuchillo en el centro del pastel insert a knife into the middle of the cakeB1 ‹cambios/medidas/ley› to introduce, bring in, institute ( frml) introducir algo EN algo:se introdujo una modificación en el reglamento a change was made in the rulesfue introducida en Europa en el siglo XVI it was introduced o brought into Europe in the 16th centuryquieren introducir un nuevo producto en el mercado they plan to introduce a new product into o bring a new product onto the market2 ‹contrabando/drogas› to bring in, smuggle inun solo perro podría introducir la enfermedad en el país a single dog could bring o introduce the disease into the countryC1 (presentar, iniciar) to introduceestas tres notas introducen el nuevo tema musical these three notes introduce the new theme2 ‹persona› (a una actividad) introducir a algn A algo to introduce sb TO sthfue él quien me introdujo a la lectura de los clásicos it was he who introduced me to the classics3 (en un ambiente) introducir a algn EN algo:su música nos introduce en un mundo mágico his music transports us to a magical worldel escritor nos introduce en la Francia del siglo pasado the writer takes us back to the France of the last century1(meterse): el agua se introducía por las ranuras the water was coming in o was seeping through the cracksla moneda rodó hasta introducirse por una grieta the coin rolled along and dropped down a crack2 «persona» to gain access tose introdujeron en el banco por un túnel they gained access to o got into the bank via a tunnel3«ideas/costumbres/moda»: introducirse EN algo: ideas foráneas que se introdujeron poco a poco en nuestra sociedad foreign ideas which gradually found their way into our societysu obra se introdujo en México a través de las traducciones de Sanz his works became known in Mexico through Sanz's translations* * *
introducir ( conjugate introducir) verbo transitivo
1 ( en general) to put … in;
‹ moneda› to insert;
introducir algo en algo to put sth into sth;
‹ moneda› to insert sth in sth
2
‹ producto› to introduce
3 ( presentar) ‹acto/cantante› to introduce
introducirse verbo pronominal
[ costumbre] to be introduced
introducir verbo transitivo
1 to introduce: su padre lo introdujo en la política, his father introduced him to politics
2 (meter) to insert, put in: introduzca una moneda, por favor, please insert coin
' introducir' also found in these entries:
Spanish:
deslizar
- embutir
- iniciar
- pasar
- sonda
- meter
English:
bring in
- dread
- feed
- input
- insert
- introduce
- jam in
- key in
- opportunity
- pack in
- phase
- promise
- put in
- stick in
- well
- work in
- bring
- float
* * *♦ vt1. [meter] [llave, carta] to put in, to insert;Informát [datos] to input, to enter;introdujo la moneda en la ranura she put o inserted the coin in the slot;introdujo la carta en el sobre he put the letter in the envelope;introduzca su número secreto enter your PIN number2. [conducir] [persona] to show in;introdujo a los visitantes en la sala de espera she showed the visitors into the waiting room3. [en película, novela] to introduce;en su última obra el autor introduce a dos nuevos personajes in his latest work the author introduces two new characters4. [medidas, ley] to introduce, to bring in;introdujeron un plan para combatir el desempleo they introduced o brought in a scheme to combat unemployment;piensan introducir cambios en la ley they are planning to make changes to the law5. [mercancías] to bring in, to introduce;los españoles introdujeron los caballos en América the Spanish introduced horses to America;una banda que introduce droga en el país a gang smuggling drugs into the country;fue él quien introdujo las ideas revolucionarias en el país it was he who introduced o brought revolutionary ideas to the countryla introdujo en el mundo de la moda he introduced her to the world of fashion;nos introdujo en los principios básicos de la astronomía he introduced us to the basic principles of astronomy* * *v/t1 introduce2 ( meter) insert3 INFOR input* * *introducir {61} vt1) : to introduce2) : to bring in3) : to insert4) : to input, to enter* * *introducir vb -
17 исследование
1.investigation 2.exploration 3.research 4.study 5.workисследование астроклиматаseeing testисследование визуальным теневым методом1.visual knife-edge test 2.visual-shadow testисследования внегалактических объектовextragalactic recearchesисследования водорода на волне 21 см21-cm (line) worksисследования Галактикиgalactic investigationsисследования галактического радиоизлученияgalactic studiesисследования дискретных радиоисточниковradio stars studiesисследования звездstellar investigationsисследование излучения водородаhydrogen line worksисследования инструментовinstrumental investigationsисследование качества астрономических изображенийseeing testисследование качества изображений при выборе места обсерваторииsite testисследования Луныlunar researchesисследования метеоровmeteor researchesисследования монохроматического радиоизлучения водорода Метагалактикиextragalactic hydrogen line studiesисследование оптики по методу ГартманаHartmann testисследования радиолинии водородаhydrogen line studiesисследования с высокой разрешающей силойhigh resolution investigationsисследования Солнца1.solar researches 2.solar worksастрономические исследования1.astronomical researches 2.astronomical studiesастрономические радиолокационные исследованиеastronomical radar worksастрономические исследование с помощью космических аппаратовspacecraft astronomyастрофизические исследованияastrophysical researchesкосмические исследования1.space exploration 2.space researchesкосмологические исследования1.cosmological investigations 2.cosmological studiesоптические исследованияoptical studiesпроблемное исследованиеbasic researchрадиоастрономические исследованияradio investigationsрадиолокационные исследования1.radar investigations 2.radar echo studiesспектральные исследованияspectroscopic researchesфотометрические исследованияphotometric studiesэкспедиционные исследованияfield tests -
18 Huygens, Christiaan
SUBJECT AREA: Horology[br]b. 14 April 1629 The Hague, the Netherlandsd. 8 June 1695 The Hague, the Netherlands[br]Dutch scientist who was responsible for two of the greatest advances in horology: the successful application of both the pendulum to the clock and the balance spring to the watch.[br]Huygens was born into a cultured and privileged class. His father, Constantijn, was a poet and statesman who had wide interests. Constantijn exerted a strong influence on his son, who was educated at home until he reached the age of 16. Christiaan studied law and mathematics at Ley den University from 1645 to 1647, and continued his studies at the Collegium Arausiacum in Breda until 1649. He then lived at The Hague, where he had the means to devote his time entirely to study. In 1666 he became a Member of the Académie des Sciences in Paris and settled there until his return to The Hague in 1681. He also had a close relationship with the Royal Society and visited London on three occasions, meeting Newton on his last visit in 1689. Huygens had a wide range of interests and made significant contributions in mathematics, astronomy, optics and mechanics. He also made technical advances in optical instruments and horology.Despite the efforts of Burgi there had been no significant improvement in the performance of ordinary clocks and watches from their inception to Huygens's time, as they were controlled by foliots or balances which had no natural period of oscillation. The pendulum appeared to offer a means of improvement as it had a natural period of oscillation that was almost independent of amplitude. Galileo Galilei had already pioneered the use of a freely suspended pendulum for timing events, but it was by no means obvious how it could be kept swinging and used to control a clock. Towards the end of his life Galileo described such a. mechanism to his son Vincenzio, who constructed a model after his father's death, although it was not completed when he himself died in 1642. This model appears to have been copied in Italy, but it had little influence on horology, partly because of the circumstances in which it was produced and possibly also because it differed radically from clocks of that period. The crucial event occurred on Christmas Day 1656 when Huygens, quite independently, succeeded in adapting an existing spring-driven table clock so that it was not only controlled by a pendulum but also kept it swinging. In the following year he was granted a privilege or patent for this clock, and several were made by the clockmaker Salomon Coster of The Hague. The use of the pendulum produced a dramatic improvement in timekeeping, reducing the daily error from minutes to seconds, but Huygens was aware that the pendulum was not truly isochronous. This error was magnified by the use of the existing verge escapement, which made the pendulum swing through a large arc. He overcame this defect very elegantly by fitting cheeks at the pendulum suspension point, progressively reducing the effective length of the pendulum as the amplitude increased. Initially the cheeks were shaped empirically, but he was later able to show that they should have a cycloidal shape. The cheeks were not adopted universally because they introduced other defects, and the problem was eventually solved more prosaically by way of new escapements which reduced the swing of the pendulum. Huygens's clocks had another innovatory feature: maintaining power, which kept the clock going while it was being wound.Pendulums could not be used for portable timepieces, which continued to use balances despite their deficiencies. Robert Hooke was probably the first to apply a spring to the balance, but his efforts were not successful. From his work on the pendulum Huygens was well aware of the conditions necessary for isochronism in a vibrating system, and in January 1675, with a flash of inspiration, he realized that this could be achieved by controlling the oscillations of the balance with a spiral spring, an arrangement that is still used in mechanical watches. The first model was made for Huygens in Paris by the clockmaker Isaac Thuret, who attempted to appropriate the invention and patent it himself. Huygens had for many years been trying unsuccessfully to adapt the pendulum clock for use at sea (in order to determine longitude), and he hoped that a balance-spring timekeeper might be better suited for this purpose. However, he was disillusioned as its timekeeping proved to be much more susceptible to changes in temperature than that of the pendulum clock.[br]Principal Honours and DistinctionsFRS 1663. Member of the Académie Royale des Sciences 1666.BibliographyFor his complete works, see Oeuvres complètes de Christian Huygens, 1888–1950, 22 vols, The Hague.1658, Horologium, The Hague; repub., 1970, trans. E.L.Edwardes, AntiquarianHorology 7:35–55 (describes the pendulum clock).1673, Horologium Oscillatorium, Paris; repub., 1986, The Pendulum Clock or Demonstrations Concerning the Motion ofPendula as Applied to Clocks, trans.R.J.Blackwell, Ames.The balance spring watch was first described in Journal des Sçavans 25 February 1675, and translated in Philosophical Transactions of the Royal Society (1675) 4:272–3.Further ReadingH.J.M.Bos, 1972, Dictionary of Scientific Biography, ed. C.C.Gillispie, Vol. 6, New York, pp. 597–613 (for a fuller account of his life and scientific work, but note the incorrect date of his death).R.Plomp, 1979, Spring-Driven Dutch Pendulum Clocks, 1657–1710, Schiedam (describes Huygens's application of the pendulum to the clock).S.A.Bedini, 1991, The Pulse of Time, Florence (describes Galileo's contribution of the pendulum to the clock).J.H.Leopold, 1982, "L"Invention par Christiaan Huygens du ressort spiral réglant pour les montres', Huygens et la France, Paris, pp. 154–7 (describes the application of the balance spring to the watch).A.R.Hall, 1978, "Horology and criticism", Studia Copernica 16:261–81 (discusses Hooke's contribution).DV
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