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1 протяженность дефекта
протяженность дефекта
Протяженность дефекта, определяемая измерением длины его индикаторного рисунка.
[Система неразрушающего контроля. Виды (методы) и технология неразрушающего контроля. Термины и определения (справочное пособие). Москва 2003 г.]Тематики
- виды (методы) и технология неразр. контроля
EN
Русско-английский словарь нормативно-технической терминологии > протяженность дефекта
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2 условная протяженность несплошности
условная протяженность несплошности
Максимальный размер зоны индикации амплитуды сигнала от несплошности. Для наклонного преобразователя это направление перпендикулярно плоскости падения луча.
Единица измерения
мм
[Система неразрушающего контроля. Виды (методы) и технология неразрушающего контроля. Термины и определения (справочное пособие). Москва 2003 г.]Тематики
- виды (методы) и технология неразр. контроля
EN
Русско-английский словарь нормативно-технической терминологии > условная протяженность несплошности
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3 suelo
m.1 floor (pavimento) (en interiores).2 soil (terreno, territorio).en suelo colombiano on Colombian soilsuelo urbanizable land suitable for development3 ground, floor, firm land.4 solum.pres.indicat.1 1st person singular (yo) present indicative of spanish verb: solar.2 1st person singular (yo) present indicative of spanish verb: soler.* * *1 (superficie) ground; (de interior) floor3 (territorio) soil, land4 (terreno) land5 (pavimento) surface6 figurado (de vasija etc) bottom\besar el suelo familiar to fall flat on one's face, hit the deckdar consigo en el suelo to fallechar al suelo to demolish, knock downechar por los suelos figurado to ruinponer algo por los suelos figurado to run something down, tear something to piecesvenirse al suelo to fall down 2 figurado to fall throughsuelo cultivable arable landsuelo de madera wooden floorsuelo patrio native land* * *noun m.1) floor2) ground3) soil* * *SM1) [en el exterior] (=tierra) ground; (=superficie) surfacecaer al suelo — to fall to the ground, fall over
echar al suelo — [+ edificio] to demolish; [+ esperanzas] to dash; [+ plan] to ruin
echarse al suelo — (=tirarse al suelo) to hurl o.s. to the ground; (=arrodillarse) to fall on one's knees
por los suelos —
tirarse por los suelos — * to roll in the aisles (with laughter) *
venirse al suelo — to fail, collapse, be ruined
suelo natal, suelo patrio — native land, native soil
2) [en edificio] (=superficie) floor; (=solería) flooring3) (=terreno) soil, landsuelo empresarial — space for office accommodation
4) [de pan, vasija] bottom* * *a) ( tierra) groundse echaron or tiraron al suelo — they threw themselves to the ground
arrastrarse por los suelos — (fam) to grovel
estar por los suelos or el suelo — (fam) precios to be rock bottom (colloq); moral/ánimos to be at rock bottom (colloq)
poner algo/a alguien por los suelos or el suelo — (fam) to run something/somebody down (colloq)
b) ( en casa) floorc) (en calle, carretera) road (surface)d) (Agr) lande) ( territorio) soilel suelo patrio — one's native soil o land
* * *= floor, ground, soil, flooring, floor surface.Ex. An enquirer wishes to retrieve documents on the 'finishing of concrete floors for industrial buildings'.Ex. A profile is a scale representation of the intersection of a vertical surface with the surface of the ground.Ex. This article diagnoses the information needs of those who work in the area of pollution of air, soil and earth.Ex. This article focusses on the need for suitable flooring strength and ceiling heights in library buildings.Ex. Floor surfaces should be chosen as a guide for the blind while avoiding deep carpets which snag wheel chairs = Se debería el suelo para guiar a los ciegos aunque debe evitarse las alfombras gruesas ya que dificultan el deslizamiento de las sillas de ruedas.----* abrillantador de suelos = floor polish.* abrillantador para el suelo = floor polish.* a nivel del suelo = at ground level.* a ras del suelo = at ground level.* calefacción por suelo radiante = radiant-floor heating, underfloor heating.* cera para suelos = floor wax.* ciencia del suelo = soil science.* clasificación del suelo = zoning.* con basura por el suelo = littered.* con el suelo de tierra = dirt-floored.* debajo del suelo = subfloor.* degradación del suelo = land degradation.* erosión del suelo = soil erosion.* fertilidad del suelo = soil fertility.* hasta el suelo = floor-length.* persona que tira basura al suelo = litterbug, litter lout.* poner por los suelos = slate, slag + Nombre + off, mouth off, say + nasty things about, call + Nombre + all the names under the sun, trash, cut + Nombre + up, tear + Nombre + down, rubbish.* por los suelos = in tatters.* recubrimiento de suelos = floor covering.* retrete de agujero en el suelo = squat toilet, squatty potty, squat loo.* revestimiento para suelos = flooring.* salinización del suelo = soil salinisation, soil salination.* sobre suelo firme = on firm footing.* suelo alzado = raised floor.* suelo arenoso = sandy soil.* suelo cenagoso = loamy soil.* suelo de madera = wood flooring.* suelo de parqué = parquet floor.* suelo lunar = regolith.* suelo margoso = loamy soil.* suelo mojado = wet floor.* suelo radiante = underfloor heating, radiant floor.* sujetar + Nombre + contra el suelo = pin + Nombre + to the floor.* tener los pies firmemente en el suelo = feet + be + firmly planted on the ground.* tirar a Alguien al suelo = knock + Nombre + to the ground, knock + Nombre + to the floor.* tirar a Alguien al suelo de un golpe = knock + Nombre + to the floor, knock + Nombre + to the ground.* tirar al suelo = upset.* tumbar a Alguien al suelo de un golpe = knock + Nombre + to the floor, knock + Nombre + to the ground.* vista a ras de suelo = worm's eye view.* * *a) ( tierra) groundse echaron or tiraron al suelo — they threw themselves to the ground
arrastrarse por los suelos — (fam) to grovel
estar por los suelos or el suelo — (fam) precios to be rock bottom (colloq); moral/ánimos to be at rock bottom (colloq)
poner algo/a alguien por los suelos or el suelo — (fam) to run something/somebody down (colloq)
b) ( en casa) floorc) (en calle, carretera) road (surface)d) (Agr) lande) ( territorio) soilel suelo patrio — one's native soil o land
* * *= floor, ground, soil, flooring, floor surface.Ex: An enquirer wishes to retrieve documents on the 'finishing of concrete floors for industrial buildings'.
Ex: A profile is a scale representation of the intersection of a vertical surface with the surface of the ground.Ex: This article diagnoses the information needs of those who work in the area of pollution of air, soil and earth.Ex: This article focusses on the need for suitable flooring strength and ceiling heights in library buildings.Ex: Floor surfaces should be chosen as a guide for the blind while avoiding deep carpets which snag wheel chairs = Se debería el suelo para guiar a los ciegos aunque debe evitarse las alfombras gruesas ya que dificultan el deslizamiento de las sillas de ruedas.* abrillantador de suelos = floor polish.* abrillantador para el suelo = floor polish.* a nivel del suelo = at ground level.* a ras del suelo = at ground level.* calefacción por suelo radiante = radiant-floor heating, underfloor heating.* cera para suelos = floor wax.* ciencia del suelo = soil science.* clasificación del suelo = zoning.* con basura por el suelo = littered.* con el suelo de tierra = dirt-floored.* debajo del suelo = subfloor.* degradación del suelo = land degradation.* erosión del suelo = soil erosion.* fertilidad del suelo = soil fertility.* hasta el suelo = floor-length.* persona que tira basura al suelo = litterbug, litter lout.* poner por los suelos = slate, slag + Nombre + off, mouth off, say + nasty things about, call + Nombre + all the names under the sun, trash, cut + Nombre + up, tear + Nombre + down, rubbish.* por los suelos = in tatters.* recubrimiento de suelos = floor covering.* retrete de agujero en el suelo = squat toilet, squatty potty, squat loo.* revestimiento para suelos = flooring.* salinización del suelo = soil salinisation, soil salination.* sobre suelo firme = on firm footing.* suelo alzado = raised floor.* suelo arenoso = sandy soil.* suelo cenagoso = loamy soil.* suelo de madera = wood flooring.* suelo de parqué = parquet floor.* suelo lunar = regolith.* suelo margoso = loamy soil.* suelo mojado = wet floor.* suelo radiante = underfloor heating, radiant floor.* sujetar + Nombre + contra el suelo = pin + Nombre + to the floor.* tener los pies firmemente en el suelo = feet + be + firmly planted on the ground.* tirar a Alguien al suelo = knock + Nombre + to the ground, knock + Nombre + to the floor.* tirar a Alguien al suelo de un golpe = knock + Nombre + to the floor, knock + Nombre + to the ground.* tirar al suelo = upset.* tumbar a Alguien al suelo de un golpe = knock + Nombre + to the floor, knock + Nombre + to the ground.* vista a ras de suelo = worm's eye view.* * *1 (tierra) groundtropezó y se cayó al suelo she tripped and fell overse echaron or tiraron al suelo they threw themselves to the groundno te sientes en el suelo que te vas a ensuciar don't sit on the ground, you'll get dirtyarrastrarse por los suelos ( fam); to grovelbesar el suelo que algn pisa ( fam); to worship the (very) ground sb walks on«moral/ánimos» to be at rock bottom ( colloq)tiene la moral por los suelos her morale is very low, her morale is at rock bottomen la carta lo ponía por los suelos in the letter she really ran him down o ( AmE) tore into him o ( BrE) slagged him off ( colloq)2 (en una casa) floorse le cayó la taza al suelo he dropped the cup on the floor3 (en una calle, carretera) road surface, road4 ( Agr) landel suelo es muy fértil the land is very fertilesuelo de labor farming o agricultural land5 (territorio) soilen suelo americano on American soilCompuestos:floorboards (pl)● suelo patrio or natalnative soil o land* * *
Del verbo solar: ( conjugate solar)
suelo es:
1ª persona singular (yo) presente indicativo
Del verbo soler: ( conjugate soler)
suelo es:
1ª persona singular (yo) presente indicativo
Multiple Entries:
solar
soler
suelo
solar adjetivo ‹energía/año/placa› solar;
■ sustantivo masculino
1 ( terreno) piece of land, site
2
3 (Per) ( casa de vecindad) tenement building
soler ( conjugate soler) verbo intransitivo:
no suele retrasarse he's not usually late;
solía correr todos los días he used to go for a run every day
suelo sustantivo masculino
d) (Agr) land
◊ el suelo patrio one's native soil o land
solar 1 sustantivo masculino
1 (terreno para edificar) plot
2 Hist (mansión ancestral) noble house
solar 2 adjetivo solar
energía solar, solar energy
luz solar, sunlight
sistema solar, solar system
solar 3 vtr (el suelo) to floor, pave
soler vi defect
1 (en presente) to be in the habit of: solemos ir en coche, we usually go by car
sueles equivocarte, you are usually wrong
2 (en pasado) solía pasear por aquí, he used to walk round here
En el presente, la traducción más común de soler es el verbo principal más usually: Suele volver a las diez. He usually comes back at ten.
Para referirnos a costumbres en el pasado hay que usar to use to o would. Would expresa acciones repetidas, mientras que to use to describe también estados o situaciones: Antes íbamos/solíamos ir a la playa en tren. We used to/would go to the beach by train.
No confundas to use to (do sthg) con to be used to (doing sthg), que significa estar acostumbrado y, al contrario que to use to, puede usarse también en presente: Estoy acostumbrado a coger el metro. I'm used to taking the metro. ➣ Ver nota en accustom
suelo sustantivo masculino
1 (tierra) ground
2 Agr land
(de cultivo) soil: es un suelo muy fértil, it's very fertile land
3 (de una casa) floor
(de la calle, carretera) surface, road
4 (país, territorio) soil: el suelo de la patria, native soil
5 (edificable) building land: aún queda mucho suelo sin construir, there's still a lot of land left to be developed
♦ Locuciones: estar por los suelos, (precios) to be rock-bottom o dirt cheap
(el ánimo) to be at rock bottom o down in the dumps
' suelo' also found in these entries:
Spanish:
acuchillar
- bambolearse
- bayeta
- brillante
- coger
- contorsionarse
- crujir
- desigualdad
- despanzurrarse
- desplomarse
- elevarse
- entarimado
- escalón
- escurridiza
- escurridizo
- fregar
- greca
- impacto
- intuitivamente
- levantarse
- limadura
- mandar
- ojo
- regar
- relucir
- reluciente
- resbalar
- rodilla
- sembrar
- sobresalir
- solar
- tender
- tierra
- tirar
- tramo
- trampa
- ánimo
- arrastrar
- baldosa
- barrer
- botar
- brillar
- brillo
- caído
- cepillo
- cera
- duela
- echar
- emparejar
- ensuciar
English:
compact
- crack
- creak
- damp
- deal with
- dip
- down
- downcast
- feel
- floor
- floorboard
- gather up
- give
- ground
- ground level
- icy
- litter
- mess
- messy
- mop
- nuisance
- pick up
- polish
- rising
- rolling
- scuff
- shove
- sit
- slump
- soggy
- soil
- stand
- stuff
- sweep
- take up
- tile
- tip out
- wipe
- crash
- cross
- drop
- empty
- free
- lay
- off
- on
- over
- stamp
- stick
- top
* * *suelo2 nm1. [pavimento] [en interiores] floor;[en el exterior] ground; Famarrastrarse por el suelo to grovel, to humble oneself;Fambesar el suelo to fall flat on one's face;echar algo por el suelo to ruin sth;Famestar por los suelos [persona, precio] to be at rock bottom;[productos] to be dirt cheap;tienen la moral por los suelos their morale has hit rock bottom;[fracasar] to fail suelo laminado laminate flooring2. [terreno, territorio] soil;[para edificar] land;en suelo colombiano on Colombian soil;el precio del suelo urbano land prices in urban areassuelo no urbanizable land which is unsuitable for development;suelo urbanizable land suitable for development* * *men el suelo on the ground;estar por los suelos fam be at rock bottom fam ;poner a alguien por los suelos run s.o. down;besar el suelo fig fall flat on one’s face;2 AGR soil* * *suelo nm1) : groundcaerse al suelo: to fall down, to hit the ground2) : floor, flooring3) tierra: soil, land* * *suelo n1. (de habitación) floor2. (del exterior) ground3. (terreno) land -
4 Bad Cast
Classified as a "major" defect by the Silk Association of America. Casts are the beginning of new cocoon filaments. Appearance - Abruptly increased diameter in a raw-silk thread. This defect may vary in length. Causes - A single cocoon filament may not have been properly " cast " on to the raw-silk thread in the reeling operation; or a " layer " of filaments may have loosened itself from the cocoon and have come off the cocoon simultaneously by passing through the rollers porcelain gauge-eyelets in a bulk, which either suddenly or gradually decreases to the required number of single cocoon filaments - that is, to the normal size of the raw-silk thread. -
5 Slug
Classified as a " major defect " by the Silk Association of America. Appearance, abruptly increased and abruptly decreased diameter in the raw silk thread. This defect is short in length, from 1/2-in. to about 1-in. -
6 Knots
In raw silk, knots arc classified as a major defect by the Silk Association of America. They are caused by tail-ends unclipped from piecing cocoon filaments together in the reeling. Knots of less than one-inch length are termed " long knots " and those more than one inch in length are termed " very long knots." -
7 strona
strona czynna/bierna — JĘZ active/passive voice
po lewej/prawej stronie — on the left/right(-hand) side
strona zewnętrzna/wewnętrzna — the outside/inside
na lewej stronie — ( ubranie) inside out
z drugiej strony — ( z drugiego końca) from the opposite direction
z jednej strony..., z drugiej strony... — on (the) one hand..., on the other hand...
to jej słaba/mocna strona — it's her weak/strong point
bilet w jedną stronę/w obie strony — single/return ticket (BRIT), one-way/round-trip ticket (US)
druga strona — ( odwrotna) the reverse (side)
* * *f.1. (= bok; skraj; aspekt) side; strona „ma” ekon. credit side; strona „winien” ekon. debit side; z jednej strony..., z drugiej strony... on (the) one hand..., on the other hand...; przejść na drugą stronę ulicy cross the street; pod drugiej stronie ulicy across the street; po prawej/lewej stronie on the right/left (hand side); racja jest po twojej stronie you're right; mieć kogoś po swojej stronie have sb on one's side; być po czyjejś stronie be on sb's side, side with sb; stanąć po czyjejś stronie take sides with sb; przejść na czyjąś stronę come over to sb's side, take one's stand at sb's side; przejść na stronę wroga defect to the enemy; przeciągnąć kogoś na swoją stonę gain sb over; walczyć po czyjejś stronie fight on the side of sb, fight side by side with sb; z mojej strony on l. for my part; to ładnie z twojej strony it is kind of you; druga strona medalu the other side of the coin; pomoc finansowa ze strony rodziców financial help on the part of one's parents; krewny ze strony matki a relative from one's mother's side; poszli każdy w swoją stronę everybody went his/her own way; włożyć sweter na lewą stronę put on the sweater inside out; po lewej stronie znajduje się pomnik... on our left we l. you can see the monument of...; patrzył w moją stronę he was looking my way; rozważyć coś ze wszystkich stron consider sth in all its aspects; pokazać się z najlepszej strony put one's best leg forward; nie należy oczekiwać pomocy z tej strony there's no help to be looked for in that quarter; cztery strony świata the four cardinal points; rozglądać się na wszystkie strony look around; rozjechać się w różne strony set off in different directions; pójść na stronę go to the restroom l. toilet; z której strony wieje wiatr? which way is the wind from?; wziąć kogoś na stronę take sb aside; strona równania mat. member l. side of an equation.2. (np. książki) page; strona domowa l. główna komp. home page; strona internetowa web page; strona tytułowa title page.3. ( cecha) aspect, angle, bearing; jasne i ciemne strony życia the rough and the smooth; znać czyjeś dobre l. złe strony know the length of sb's foot; tłumaczenie nie jest moją mocną stroną translation is not one of my strong points; ta praca ma też swoje dobre/złe strony there are also good/bad aspects of this job; znać kogoś z dobrej strony know the good side of sb.4. (okolica, kraj) parts; neighborhood; Br. neighbourhood; nie znam tych stron I don't know these parts; z jakich stron pani pochodzi where(abouts) do you come from?; to są moje rodzinne strony this is my homeland, that's where I come from; tęsknię do stron ojczystych I miss my homeland.5. (= uczestnik sporu) party; walczące strony the warring parties; te propozycje nie mogą być zaakceptowane przez stronę polską these proposals cannot be accepted by the Polish delegation.6. prawn. party; być stroną w czymś be a party to sth; nakłonić strony do ugody persuade the parties to reach an amicable agreement; pełnomocnik strony a party's attorney(-in-fact); wysokie układające się strony the high contracting parties.7. gram. voice; strona bierna passice voice, the passive; strona czynna active voice, the active; strona zwrotna the reflexive, middle voice.The New English-Polish, Polish-English Kościuszko foundation dictionary > strona
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8 определять
Определять - to determine, to estimate, to assess (расчётом, измерением); to infer (логически); to diagnose (диагностировать); to detect (обнаруживать); to identify (опознавать, выявлять); to control, to govern, to dictate, to dominate, to establish (обуславливать, играть главную роль); to define (формулировать), to measure (знания, способности)No capital cost penalty was assessed against this design. (Увеличение капитальных затрат для этой конструкции не определялось.)A second critical number at 2200 was inferred, based on further changes in the shape of the local mass transfer rate profile, to indicate the onset of vortex shedding in the separated region.Inasmuch as those measured values of the position cause greatly magnified errors in the second divided difference, it was possible to detect which measurements were not precisely correct.By this process, an axial station was identified at which the pure downstream motion was punctuated by the lunges of the reattachment zone.A similar result was reported in [...] for cantilever designs with short spans, where bearing deflection controls pinion motion. An opposite trend is displayed for the straddle where the shaft, stiffened by a decrease in length, dictates pinion deflection.However, manufacturing considerations will establish a minimum practical fin thickness.Finally, the convection currents become established and dominate the heat transfer.Also calculated were the transferred volume and the void volume, both of which will be defined in the section describing the transfer model.The testing measures your command of the English language in the areas of listening, reading, writing, and speaking.Определять(ся) поAs the fan blade material is titanium the pressure instrumented blades are identified magnetically by a flame sprayed soft iron patch applied to the blade tips.The temperature gradient on the surface can be determined from the temperature profile.System stability was indicated by a vanishing of the sustained oscillatory behavior and the reappearance of the inherent random fluctuations.Defect size can thus be measured by frequency as follows.F(Tw/T) was found to be unity in this regime if all properties were based on the film temperature.Русско-английский научно-технический словарь переводчика > определять
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9 stuk
stuk1〈 het〉1 [deel] piece ⇒ part, fragment, 〈 land〉 lot, length 〈 stof, plank, koord〉 〈ook → link=stukje stukje〉2 [(grote) hoeveelheid] lot7 [document] document, paper10 [muziekstuk] piece (of music)13 [gestalte] stature, build♦voorbeelden:1 stukken en brokken • bits and pieces, odds and endsiets in stukken snijden • cut something up (into pieces)een stuk met iemand meelopen • accompany someone part of the way〈 figuurlijk〉 werken dat de stukken er af vliegen • work with a vengeance/at full tiltiets aan stukken slaan/gooien • knock/smash something to piecesiets in stukken scheuren • tear something to pieceshet perceel werd in drie stukken verdeeld • the parcel was divided into three lotseen stuk uit een boek voorlezen • read a passage/section from a book〈 figuurlijk〉 een man uit één stuk • a man of character/of honour, salt of the earthuit één stuk vervaardigd • made in/of one pieceeen goed stuk werk • a fine piece of workeen stuk beter • much/a lot betterstukken beter • quite a lot/far bettermijn klas is een heel stuk voor • my class is well aheadzij is een stuk afgeslankt • she has lost quite a bit of weightdat zou ons een stuk verder brengen • that would help us a lotiets/iemand met stukken slaan • defeat someone/something by a large marginop geen stukken na • not by a long way/shot/ 〈 Brits-Engels ook〉chalk, not nearly3 een stuk gereedschap • a piece of equipment, a tooleen stuk speelgoed • a toyeen groot stuk zeep • a large cake/tablet of soapsigaren van twee gulden per stuk • cigars of two guilders each/apiece/a pieceper stuk verkopen • sell by the piece/singlystuk voor stuk werden de onderdelen vervangen • the parts were replaced one by onehet zijn stuk voor stuk deugnieten • they're rascals, every one of themtwintig stuks vee • twenty head of cattlevier stuks bagage • four pieces of luggageeen stuk of tien appels • about ten/ten or so apples4 aangetekend stuk • registered mail/letter/item5 een lekker stuk • a nice bit of skirt/stuff/crumpetiets met de stukken kunnen bewijzen • have documents to prove something11 een stuk in een broek zetten • patch a pair of trousers/ Apantshij had stukken op zijn ellebogen • he had elbow patches〈 informeel〉 een raar stuk vreten • a rum customer, a right one13 klein van stuk • small, of small stature, shortstukken aan toonder • bearer securities¶ op zijn stuk blijven staan • hold one's ground, stick to one's gunsvan zijn stuk raken • lose one's head, be put off one's balanceiemand van zijn stuk brengen • unsettle/unnerve/disconcert someoneeen stuk in de kraag hebben • be tight/plasteredop het stuk van … • as far as … is concerned————————stuk21 [aan stukken] apart, to pieces3 [onder de indruk, ingenomen met] impressed (by)♦voorbeelden:het kopje viel stuk • the cup fell to pieces/fell and brokeiets stuk maken • break/ruin something -
10 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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11 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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