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21 Breguet, Abraham-Louis
SUBJECT AREA: Horology[br]baptized 10 January 1747 Neuchâtel, Switzerlandd. 17 September 1823 Paris, France[br]Swiss clock-and watchmaker who made many important contributions to horology.[br]When Breguet was 11 years old his father died and his mother married a Swiss watchmaker who had Paris connections. His stepfather introduced him to horology and this led to an apprenticeship in Paris, during which he also attended evening classes in mathematics at the Collège Mazarin. In 1775 he married and set up a workshop in Paris, initially in collaboration with Xavier Gide. There he established a reputation among the aristocracy for elegant and innovative timepieces which included a perpétuelle, or self-winding watch, which he developed from the ideas of Perrelet. He also enjoyed the patronage of Marie Antoinette and Louis XVI. During the French Revolution his life was in danger and in 1793 he fled to Neuchâtel. The two years he spent there comprised what was intellectually one of his most productive periods and provided many of the ideas that he was able to exploit after he had returned to Paris in 1795. By the time of his death he had become the most prestigious watchmaker in Europe: he supplied timepieces to Napoleon and, after the fall of the Empire, to Louis XVIII, as well as to most of the crowned heads of Europe.Breguet divided his contributions to horology into three categories: improvements in appearance and functionality; improvements in durability; and improvements in timekeeping. His pendule sympathique was in the first category and consisted of a clock which during the night set a watch to time, regulated it and wound it. His parachute, a spring-loaded bearing, made a significant contribution to the durability of a watch by preventing damage to its movement if it was dropped. Among the many improvements that Breguet made to timekeeping, two important ones were the introduction of the overcoil balance spring and the tourbillon. By bending the outside end of the balance spring over the top of the coils Breguet was able to make the oscillations of the balance isochronous, thus achieving for the flat spring what Arnold had already accomplished for the cylindrical balance spring. The timekeeping of a balance is also dependent on its position, and the tourbillon was an attempt to average-out positional errors by placing the balance wheel and the escapement in a cage that rotated once every minute. This principle was revived in a simplified form in the karussel at the end of the nineteenth century.[br]Principal Honours and DistinctionsHorloger de la marine 1815. Chevalier de la Légion d'honneur 1815.BibliographyBreguet gathered information for a treatise on horology that was never published but which was later plagiarized by Louis Moinet in his Traité d'horlogerie, 1848.Further ReadingG.Daniels, 1974, The An of Breguet, London (an account of his life with a good technical assessment of his work).DV -
22 Unruh
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23 Harrison, John
[br]b. 24 March 1693 Foulby, Yorkshire, Englandd. 24 March 1776 London, England[br]English horologist who constructed the first timekeeper of sufficient accuracy to determine longitude at sea and invented the gridiron pendulum for temperature compensation.[br]John Harrison was the son of a carpenter and was brought up to that trade. He was largely self-taught and learned mechanics from a copy of Nicholas Saunderson's lectures that had been lent to him. With the assistance of his younger brother, James, he built a series of unconventional clocks, mainly of wood. He was always concerned to reduce friction, without using oil, and this influenced the design of his "grasshopper" escapement. He also invented the "gridiron" compensation pendulum, which depended on the differential expansion of brass and steel. The excellent performance of his regulator clocks, which incorporated these devices, convinced him that they could also be used in a sea dock to compete for the longitude prize. In 1714 the Government had offered a prize of £20,000 for a method of determining longitude at sea to within half a degree after a voyage to the West Indies. In theory the longitude could be found by carrying an accurate timepiece that would indicate the time at a known longitude, but the requirements of the Act were very exacting. The timepiece would have to have a cumulative error of no more than two minutes after a voyage lasting six weeks.In 1730 Harrison went to London with his proposal for a sea clock, supported by examples of his grasshopper escapement and his gridiron pendulum. His proposal received sufficient encouragement and financial support, from George Graham and others, to enable him to return to Barrow and construct his first sea clock, which he completed five years later. This was a large and complicated machine that was made out of brass but retained the wooden wheelwork and the grasshopper escapement of the regulator clocks. The two balances were interlinked to counteract the rolling of the vessel and were controlled by helical springs operating in tension. It was the first timepiece with a balance to have temperature compensation. The effect of temperature change on the timekeeping of a balance is more pronounced than it is for a pendulum, as two effects are involved: the change in the size of the balance; and the change in the elasticity of the balance spring. Harrison compensated for both effects by using a gridiron arrangement to alter the tension in the springs. This timekeeper performed creditably when it was tested on a voyage to Lisbon, and the Board of Longitude agreed to finance improved models. Harrison's second timekeeper dispensed with the use of wood and had the added refinement of a remontoire, but even before it was tested he had embarked on a third machine. The balance of this machine was controlled by a spiral spring whose effective length was altered by a bimetallic strip to compensate for changes in temperature. In 1753 Harrison commissioned a London watchmaker, John Jefferys, to make a watch for his own personal use, with a similar form of temperature compensation and a modified verge escapement that was intended to compensate for the lack of isochronism of the balance spring. The time-keeping of this watch was surprisingly good and Harrison proceeded to build a larger and more sophisticated version, with a remontoire. This timekeeper was completed in 1759 and its performance was so remarkable that Harrison decided to enter it for the longitude prize in place of his third machine. It was tested on two voyages to the West Indies and on both occasions it met the requirements of the Act, but the Board of Longitude withheld half the prize money until they had proof that the timekeeper could be duplicated. Copies were made by Harrison and by Larcum Kendall, but the Board still continued to prevaricate and Harrison received the full amount of the prize in 1773 only after George III had intervened on his behalf.Although Harrison had shown that it was possible to construct a timepiece of sufficient accuracy to determine longitude at sea, his solution was too complex and costly to be produced in quantity. It had, for example, taken Larcum Kendall two years to produce his copy of Harrison's fourth timekeeper, but Harrison had overcome the psychological barrier and opened the door for others to produce chronometers in quantity at an affordable price. This was achieved before the end of the century by Arnold and Earnshaw, but they used an entirely different design that owed more to Le Roy than it did to Harrison and which only retained Harrison's maintaining power.[br]Principal Honours and DistinctionsRoyal Society Copley Medal 1749.Bibliography1767, The Principles of Mr Harrison's Time-keeper, with Plates of the Same, London. 1767, Remarks on a Pamphlet Lately Published by the Rev. Mr Maskelyne Under theAuthority of the Board of Longitude, London.1775, A Description Concerning Such Mechanisms as Will Afford a Nice or True Mensuration of Time, London.Further ReadingR.T.Gould, 1923, The Marine Chronometer: Its History and Development, London; reprinted 1960, Holland Press.—1978, John Harrison and His Timekeepers, 4th edn, London: National Maritime Museum.H.Quill, 1966, John Harrison, the Man who Found Longitude, London. A.G.Randall, 1989, "The technology of John Harrison's portable timekeepers", Antiquarian Horology 18:145–60, 261–77.J.Betts, 1993, John Harrison London (a good short account of Harrison's work). S.Smiles, 1905, Men of Invention and Industry; London: John Murray, Chapter III. Dictionary of National Biography, Vol. IX, pp. 35–6.DV -
24 пружинные весы
1) General subject: Roman balance, quick balance, spiral balance, spring balance2) Engineering: spring scales3) Automobile industry: spring scale4) Makarov: compression balance -
25 безмен
1) General subject: Danish balance, Roman balance, quick balance, spiral balance, spring balance, steelyard, steelyard (рычажный), weighbeam2) Engineering: beam scale, kitchen balance, steelyard balance, steelyard-type balance, spring scale3) Automobile industry: weigh beam -
26 Le Roy, Pierre
SUBJECT AREA: Horology[br]b. 24 November 1717 Paris, Franced. 25 August 1785 Viry-sur-Orge, France[br]French horologist who invented the detached détente escapement and the compensation balance.[br]Le Roy was born into a distinguished horological family: his father, Julien, was Clockmaker to the King. Pierre became Master in 1737 and continued to work with his father, taking over the business when his father died in 1759. However, he seems to have left the commercial side of the business to others so that he could concentrate on developing the marine chronometer. Unlike John Harrison, he believed that the solution lay in detaching the escapement from the balance, and in 1748 he submitted a proposal for the first detached escapement to the Académie des Sciences in Paris. He also differed from Harrison in his method of temperature compensation, which acted directly on the balance by altering its radius of gyration. This was achieved either by mounting thermometers on the balance or by using bimetallic strips which effectively reduced the diameter of the balance as the temperature rose (with refinements, this later became the standard method of temperature compensation in watches and chronometers). Le Roy had already discovered that for every spiral balance spring there was a particular length at which it would be isochronous, and this method of temperature compensation did not destroy that isochronism by altering the length, as other methods did. These innovations were incorporated in a chronometer with an improved detached escapement which he presented to Louis XV in 1766 and described in a memoir to the Académie des Sciences. This instrument contained the three essential elements of all subsequent chronometers: an isochronous balance spring, a detached escapement and a balance with temperature compensation. Its performance was similar to that of Harrison's fourth timepiece, and Le Roy was awarded prizes by the Académie des Sciences for the chronometer and for his memoir. However, his work was never fully appreciated in France, where he was over-shadowed by his rival Ferdinand Berthoud. When Berthoud was awarded the coveted title of Horloger de la Marine, Le Roy became disillusioned and shortly afterwards gave up chronometry and retired to the country.[br]Principal Honours and DistinctionsHorloger du Roi 1760.Bibliography1748, "Echappement à détente", Histoire et mémoires de l'Académie Royale des Sciences.Further ReadingR.T.Gould, 1923, The Marine Chronometer: Its History and Development, London; reprinted 1960, Holland Press (still the standard work on the subject).DV -
27 динамометр
1) General subject: dynamometer2) Naval: weighing machine3) Medicine: dynamometer (прибор для измерения силы мышцы), ergometer, myodynamometer (прибор для определения силы мышцы), sthenometer (прибор для измерения силы, развиваемой какой-л. группой мышц)4) Engineering: force gage, impact weigher, load gage, spring balance, spring gage, testing machine, dyno, spring scale5) Construction: dynamometric measuring appliance (для измерения величины силы), load indicator6) Automobile industry: forcemeter7) Forestry: skyline tension indicator8) Textile: strength testing machine, tester10) Astronautics: force indicator, force measuring device, force-measuring device11) Metrology: force gauge, load cell12) Polymers: breaking tester, pendulum balance, strength tester, strength-testing machine, tensile strength tester, tensile testing machine, tension strength tester13) Automation: force dynamometer14) General subject: push-pull scale (индикатор стрелочного типа)15) Makarov: dynamometer (для измерения мощности работы или вращающего момента), dynamometer (прибор для измерения силы, развиваемой какой-л. группой мышц), load gauge (для измерения усилия), spring balance (для измерения усилия), tensile tester, tension tester, testing machine (испытательная машина) -
28 Tompion, Thomas
SUBJECT AREA: Horology[br]baptized 25 July 1639 Ickwell Green, Englandd. 20 November 1713 London, England[br]English clock-and watchmaker of great skill and ingenuity who laid the foundations of his country's pre-eminence in that field.[br]Little is known about Tompion's early life except that he was born into a family of blacksmiths. When he was admitted into the Clockmakers' Company in 1671 he was described as a "Great Clockmaker", which meant a maker of turret clocks, and as these clocks were made of wrought iron they would have required blacksmithing skills. Despite this background, he also rapidly established his reputation as a watchmaker. In 1674 he moved to premises in Water Lane at the sign of "The Dial and Three Crowns", where his business prospered and he remained for the rest of his life. Assisted by journeymen and up to eleven apprentices at any one time, the output from his workshop was prodigious, amounting to over 5,000 watches and 600 clocks. In his lifetime he was famous for his watches, as these figures suggest, but although they are of high quality they do not differ markedly from those produced by other London watchmakers of that period. He is now known more for the limited number of elaborate clocks that he produced, such as the equation clock and the spring-driven clock of a year's duration, which he made for William III. Around 1711 he took into partnership his nephew by marriage, George Graham, who carried on the business after his death.Although Tompion does not seem to have been particularly innovative, he lived at a time when great advances were being made in horology, which his consummate skill as a craftsman enabled him to exploit. In this he was greatly assisted by his association with Robert Hooke, for whom Tompion constructed a watch with a balance spring in 1675; at that time Hooke was trying to establish his priority over Huygens for this invention. Although this particular watch was not successful, it made Tompion aware of the potential of the balance spring and he became the first person in England to apply Huygens's spiral spring to the balance of a watch. Although Thuret had constructed such a watch somewhat earlier in France, the superior quality of Tompion's wheel work, assisted by Hooke's wheel-cutting engine, enabled him to dominate the market. The anchor escapement (which reduced the amplitude of the pendulum's swing) was first applied to clocks around this time and produced further improvements in accuracy which Tompion and other makers were able to utilize. However, the anchor escapement, like the verge escapement, produced recoil (the clock was momentarily driven in reverse). Tompion was involved in attempts to overcome this defect with the introduction of the dead-beat escapement for clocks and the horizontal escapement for watches. Neither was successful, but they were both perfected later by George Graham.[br]Principal Honours and DistinctionsMaster of the Clockmakers' Company 1703.Bibliography1695, with William Houghton and Edward Barlow, British patent no. 344 (for a horizontal escapement).Further ReadingR.W.Symonds, 1951, Thomas Tompion, His Life and Work, London (a comprehensive but now slightly dated account).H.W.Robinson and W.Adams (eds), 1935, The Diary of Robert Hooke (contains many references to Tompion).D.Howse, 1970, The Tompion clocks at Greenwich and the dead-beat escapement', Antiquarian Horology 7:18–34, 114–33.DV -
29 пружина
fFRA ressort mDEU Feder fENG springITA molla fPLN sprężyna fRUS пружина fсм. поз. 707 на,
,
,
,
,
,
,
FRA ressort m de suspensionDEU Haltefeder fITA molla f di sospensionePLN sprężyna f zawieszeniaRUS пружина fсм. поз. 2307 на—FRA ressort m de condamnationDEU Riegelfeder fENG locking springITA molla f di bloccoPLN sprężyna f ryglaRUS пружина f движкасм. поз. 1152 напружина для внутреннего поводка защёлки
—FRA ressort m spiral du fouillot intérieurDEU Feder f für innere SchloßnußITA molla f a spirale del nasello internoPLN sprężyna f zwojowa orzecha wewnętrznegoRUS пружина f для внутреннего поводка защёлкисм. поз. 1133 на—FRA ressort m de rappel du verrouillageDEU Feder f für KlappenverschlußITA molla f di richiamo del dispositivo di bloccaggioPLN sprężyna f ryglaRUS пружина f для запора люкасм. поз. 1392 напружина для наружного поводка защёлки
—FRA ressort m du fouillot extérieurDEU Feder f für äußere SchloßnußITA molla f del nasello esternoPLN sprężyna f orzecha zewnętrznegoRUS пружина f для наружного поводка защёлкисм. поз. 1132 на—FRA ressort m de renforcementDEU Deckfeder fITA molla f di forzamentoPLN sprężyna f wzmacniającaRUS пружина f жёсткостисм. поз. 1120 на—FRA ressort m de verrouDEU Riegelfeder fENG lock springITA molla f di bloccaggioPLN sprężyna f ryglaRUS пружина f запорного механизмасм. поз. 147 на—FRA ressort m du doigt de sécurité du fouillot intérieurDEU Rastfeder f für innere SchloßnußITA molla f del nottolino di sicurezza del nasello internoPLN sprężyna f rygla orzecha wewnętrznegoRUS пружина f защёлкисм. поз. 1137 наFRA ressort m de pèneDEU Fallenfeder fENG bolt springITA molla f del palettoPLN sprężyna f zapadki zamkaRUS пружина f защёлкисм. поз. 1142 на—FRA ressort m de soupapeDEU Ventilfeder fENG valve springITA molla f della valvolaPLN sprężyna f zaworuRUS пружина f клапанасм. поз. 2234 на,
—FRA ressort m de couvercle de godet graisseurDEU Feder f für Schmierdeckel mITA molla f del coperchio per beccuccio ungitorePLN sprężyna f pokrywkiRUS пружина f крышки маслёнкисм. поз. 215 на—FRA ressort m de rappel de consoleDEU Klemmfeder fENG bracket springITA molla f di richiamo della mensolaPLN sprężyna f stolikaRUS пружина f откидного столикасм. поз. 1769 напружина оттягивающая тормозной башмак
—FRA ressort m du sabotDEU Bremsklotzstellfeder fITA molla f dello zoccoloPLN sprężyna f klockaRUS пружина f оттягивающая тормозной башмаксм. поз. 558 на—FRA ressort m de tampon graisseurDEU Feder f für Schmierpolster nITA molla f del guancialetto lubrificantePLN sprężyna f przyrządu smarującegoRUS пружина f польстерасм. поз. 191 на—FRA ressort m d’obturateurDEU Staubringfeder fITA molla f dell'otturatorePLN sprężyna f uszczelkiRUS пружина f пылевой шайбысм. поз. 193 на,
—FRA ressort m de siègeDEU Federeinlage f für Sitz mENG seat springITA molla f del divanoRUS пружина f сидениясм. поз. 1741 на,
,
—FRA ressort m de dossierDEU Federeinlage f für Rückenlehne fENG seat-back springITA molla f di schienaleRUS пружина f спинки диванасм. поз. 1772 на—FRA ressort m du verrou de condamnationDEU Feder f für Riegeldom mITA molla f del dispositivo di bloccaggioPLN sprężyna f ryglaRUS пружина f стержня запорасм. поз. 1157 на—FRA ressort m de l’arrêt des fouillotsDEU Feder f zur SperrklinkeITA molla f dell'arresto del naselloPLN sprężyna f pazura blokującegoRUS пружина f стопорасм. поз. 1130 на—FRA ressort m de garnitureDEU Stulpfeder fITA molla f di guarnizionePLN pierścień m sprężystyRUS пружина f уплотняющая воротниксм. поз. 669 на—FRA ressort m de butéeDEU Druckfeder f für TürpufferENG stop springITA molla f (del perno di battuta)PLN sprężyna f odbijakaRUS пружина f упора дверисм. поз. 1256 на—FRA ressort m de rappel du pèneDEU Rückziehfeder f für FalleITA molla f di richiamo del palettoPLN sprężyna f powrotnikaRUS пружина f фиксатора защёлкисм. поз. 1161 на—FRA ressort m de rappelDEU Kolben-Rückdruckfeder fENG return springITA molla f di richiamoPLN sprężyna f tłokaRUS пружина f штокасм. поз. 673 напружина, возвратная
—FRA ressort m de rappelDEU Rückziehfeder fENG return springITA molla f di richiamoPLN sprężyna f powrotnaRUS пружина f, возвратнаясм. поз. 522 на,
,
,
,
,
,
,
пружина, коническая
—FRA ressort m coniqueDEU Schraubenfeder f, kegelförmigeENG conical springITA molla f conicaPLN sprężyna f stożkowaRUS пружина f, коническаясм. поз. 554 напружина, коническая спиральная
—FRA ressort m en voluteDEU Kegelfeder fENG volute springITA molla f a bovoloPLN sprężyna f ślimakowaRUS пружина f, коническая спиральнаясм. поз. 406 напружина, контактная
—FRA ressort m de connexionDEU Kontaktfeder fITA molla f di contattoPLN sprężyna f kontaktowaRUS пружина f, контактнаясм. поз. 2152 напружина, натяжная
—FRA ressort m de tension de courroieDEU Riemenspannfeder fITA molla f di tensione della cinghiaPLN sprężyna f naprężacza pasaRUS пружина f, натяжнаясм. поз. 2022 напружина, резиновая
—FRA ressort m de traction en caoutchoucDEU Gummifeder f für ZugeinrichtungENG rubber springITA molla f di trazione di gommaPLN amortyzator m cięgłowy, gumowyRUS пружина f, резиноваясм. поз. 474 напружина, спиральная
—FRA ressort m en hélice de suspension primaireDEU Schraubentragfeder fITA molla f ad ehca di sospensione primariaPLN sprężyna f nośna śrubowaRUS пружина f, спиральнаясм. поз. 255 на,
,
,
пружина, спиральная внутренняя
—FRA ressort m en hélice de suspension secondaireDEU Schraubenfeder fITA molla f ad elica di sospensione secondariaPLN sprężyna f śrubowa bujakaRUS пружина f, спиральная внутренняясм. поз. 301 на,
пружина, спиральная для разгрузки скользунов
—DEU Schraubenfeder f für Entlastung der GleitstückeITA molla f di scarico parziale sui pattiniPLN sprężyna f odciągającaRUS пружина f, спиральная для разгрузки скользуновсм. поз. 267 на,
пружина, спиральная коническая
—FRA ressort m de traction en voluteDEU Wickelfeder f für ZugeinrichtungENG volute-springITA molla f di trazione a bovoloPLN sprężyna f cięgłaRUS пружина f, спиральная коническаясм. поз. 459 на,
пружина, стиральная
—FRA ressort m en héliceDEU Schraubenfeder fENG helical springITA molla f elicoidalePLN sprężyna f śrubowaRUS пружина f, стиральнаясм. поз. 425 напружина, стопорная
—FRA ressort m d’arrêt de porteDEU Feststellfeder fENG door-stop springITA molla f d'arresto della portaPLN sprężyna f ustalaezaRUS пружина f, стопорнаясм. поз. 1119 напружина, тарированная
—FRA ressort m antagonisteDEU Wiegefeder fENG balance springITA molla f antagonistaPLN sprężyna f zwrotnaRUS пружина f, тарированнаясм. поз. 656 на -
30 спиральная пружина
1) General subject: coil spring2) Engineering: balance spring3) Construction: helical spring, spiral spring4) Railway term: coiled spring5) Automobile industry: volute spring, hair spring6) Textile: spiral coil, spring coil7) Automation: (плоская) spiral spring8) Arms production: ring springУниверсальный русско-английский словарь > спиральная пружина
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31 Unruhfeder
f1. balance spring2. hair spring Am.f[über der Unruh]oversprung balance spring -
32 уравновешивающая пружина
1) Engineering: compensating spring, relief spring, relieving spring2) Automobile industry: balancing spring3) Mining: levelling spring4) Drilling: balance springУниверсальный русско-английский словарь > уравновешивающая пружина
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33 bilanciere
"rocker arm;Kipphebel;Schwinghebel;balancim"* * *bilanciere s.m.1 ( di orologio) balance (wheel): bilanciere compensato, compensation balance; molla del bilanciere, hairspring (o balance spring)* * *[bilan'tʃɛre]sostantivo maschile1) mecc. rocker arm2) (di orologio) balance wheel3) (di funambolo) balancing pole; (di portatore di pesi) yoke4) sport (attrezzo) barbell* * *bilanciere/bilan't∫εre/sostantivo m.1 mecc. rocker arm2 (di orologio) balance wheel3 (di funambolo) balancing pole; (di portatore di pesi) yoke4 sport (attrezzo) barbell. -
34 весовой балансир
Авиация и космонавтика. Русско-английский словарь > весовой балансир
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35 трос
mтрос уравновешивающего механизма, боковой
—FRA câble m inférieur d’équilibrageITA cavo m inferiore d'equilibraturaPLN linka f dolna wyrównywaczaRUS трос m уравновешивающего механизма, боковойсм. поз. 1318 натрос уравновешивающего механизма, верхний
—FRA câble m supérieur d’équilibrageITA cavo m superiore d'eqtrilibraturaPLN linka f górna wyrównywaczaRUS трос m уравновешивающего механизма, верхнийсм. поз. 1309 натрос, направляющий
—FRA câble m de guidage de parallélismeENG guide cableITA cavo m di guida di parallelismoPLN linka f okiennaRUS трос m, направляющийсм. поз. 1303 на -
36 волосок
1) General subject: filament, hair, hairspring2) Engineering: balance spring, hair-spring, helical spring, thread3) Agriculture: fibre4) Forestry: tula5) Metallurgy: hairline6) Cartography: filament (в сетке нитей), hair line (в оптических приборах)7) Drilling: fiber8) Makarov: hair (в прецизионных приборах), hair spring (в часах) -
37 балансирная пружина
1) General subject: balance spring2) Engineering: balancing spring3) Railway term: equalizer springУниверсальный русско-английский словарь > балансирная пружина
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38 контрпружина
Engineering: antagonistic spring, balance spring, counterspring, opposing spring -
39 Guillaume, Charles-Edouard
[br]b. 15 February 1861 Fleurier, Switzerlandd. 13 June 1938 Sèvres, France[br]Swiss physicist who developed two alloys, "invar" and "elinvar", used for the temperature compensation of clocks and watches.[br]Guillaume came from a family of clock-and watchmakers. He was educated at the Gymnasium in Neuchâtel and at Zurich Polytechnic, from which he received his doctorate in 1883 for a thesis on electrolytic capacitors. In the same year he joined the International Bureau of Weights and Measures at Sèvres in France, where he was to spend the rest of his working life. He retired as Director in 1936. At the bureau he was involved in distributing the national standards of the metre to countries subscribing to the General Conference on Weights and Measures that had been held in 1889. This made him aware of the crucial effect of thermal expansion on the lengths of the standards and he was prompted to look for alternative materials that would be less costly than the platinum alloys which had been used. While studying nickel steels he made the surprising discovery that the thermal expansion of certain alloy compositions was less than that of the constituent metals. This led to the development of a steel containing about 36 per cent nickel that had a very low thermal coefficient of expansion. This alloy was subsequently named "invar", an abbreviation of invariable. It was well known that changes in temperature affected the timekeeping of clocks by altering the length of the pendulum, and various attempts had been made to overcome this defect, most notably the mercury-compensated pendulum of Graham and the gridiron pendulum of Harrison. However, an invar pendulum offered a simpler and more effective method of temperature compensation and was used almost exclusively for pendulum clocks of the highest precision.Changes in temperature can also affect the timekeeping of watches and chronometers, but this is due mainly to changes in the elasticity or stiffness of the balance spring rather than to changes in the size of the balance itself. To compensate for this effect Guillaume developed another more complex nickel alloy, "elinvar" (elasticity invariable), whose elasticity remained almost constant with changes in temperature. This had two practical consequences: the construction of watches could be simplified (by using monometallic balances) and more accurate chronometers could be made.[br]Principal Honours and DistinctionsNobel Prize for Physics 1920. Corresponding member of the Académie des Sciences. Grand Officier de la Légion d'honneur 1937. Physical Society Duddell Medal 1928. British Horological Institute Gold Medal 1930.Bibliography1897, "Sur la dilation des aciers au nickel", Comptes rendus hebdomadaires des séances de l'Académie des sciences 124:176.1903, "Variations du module d"élasticité des aciers au nickel', Comptes rendushebdomadaires des séances de l'Académie des sciences 136:498."Les aciers au nickel et leurs applications à l'horlogerie", in J.Grossmann, Horlogerie théorique, Paris, Vol. II, pp. 361–414 (describes the application of invar and elinvar to horology).Sir Richard Glazebrook (ed.), 1923 "Invar and Elinvar", Dictionary of Applied Physics, 5 vols, London, Vol. V, pp. 320–7 (a succinct account in English).Further ReadingR.M.Hawthorne, 1989, Nobel Prize Winners, Physics, 1901–1937, ed. F.N.Magill, Pasadena, Salem Press, pp. 244–51.See also: Le Roy, PierreDVBiographical history of technology > Guillaume, Charles-Edouard
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40 유사
n. hair spring, balance spring, emergency, reminiscences, quicksand, similarity, resemblance, analogy, semblance, similitude, comparison, kinship, parallelism, kindred, alliance
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spring — Synonyms and related words: Eastertide, Highland fling, Lastex, Maytime, accrue from, adaptability, adolescence, aestival, air mattress, airiness, ambition, anabasis, and jump, appear, arctic, arise, arrive, ascension, ascent, aspiration, autumn … Moby Thesaurus
Spring balance — Spring Spring, n. [AS. spring a fountain, a leap. See {Spring}, v. i.] 1. A leap; a bound; a jump. [1913 Webster] The prisoner, with a spring, from prison broke. Dryden. [1913 Webster] 2. A flying back; the resilience of a body recovering its… … The Collaborative International Dictionary of English
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