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21 Cruickshank, William
SUBJECT AREA: Electricity[br]d. 1810/11 Scotland[br]Scottish chemist and surgeon, inventor of a trough battery developed from Volta's pile.[br]Cruickshank graduated MA from King's College, Aberdeen, in 1765, and later gained a Diploma of the Royal College of Surgeons. When chemistry was introduced in 1788 into the course at the Royal Military Academy in Woolwich, Cruickshank became a member of staff, serving as Assistant to Dr A.Crawford, the Lecturer in Chemistry. Upon Crawford's death in 1796 Cruickshank succeeded him as Lecturer and held the post until his retirement due to ill health in 1804. He also held the senior posts of Chemist to the Ordnance at Woolwich and Surgeon to the Ordnance Medical Department. He should not be confused with William Cumberland Cruickshank (1745–1800), who was also a surgeon and Fellow of the Royal Society. In 1801, shortly after Volta's announcement of his pile, Cruickshank built a voltaic pile to facilitate his experiments in electrochemistry. The pile had zinc and silver plates about 1½ in2 (10 cm2) with interposed papers moistened with ammonium chloride. Dissatisfied with this arrangement, Cruickshank devised a horizontal trough battery in which a wooden box was divided into cells, each holding a pair of zinc and silver or zinc and copper plates. Charged with a dilute solution of ammonium chloride, the battery, which was typically of sixty cells, was found to be more convenient to use than a pile and it, or a derivative, was generally adopted for electrochemical experiments including tose of Humphrey Davy during the early years of the nineteenth century.[br]Principal Honours and DistinctionsFRS 1802.Bibliography1801, article in Nicholsons Journal 4:187–91 (describes Cruickshank's original pile). 1801, article in Nicholsons Journal 4:245–64 (describes his trough battery).Further ReadingB.Bowers, 1982, A History of Electric Light and Power, London (a short account). A.Courts, 1959, "William Cruickshank", Annals of Science 15:121–33 GW -
22 rendere
restituire give back, returnfruttare yieldsenso, idea renderrendere un servizio a qualcuno do someone a favo(u)rrendere conto a qualcuno di qualcosa account to someone for somethingrendere felice make happy* * *rendere v.tr.1 to give* back, to return; to restore: glielo resi ieri, I gave it back to him yesterday; ho reso il cappello che avevo preso per sbaglio, I have given back the hat I took by mistake; non mi ha ancora reso il libro, he has not yet returned the book to me; rendimi i soldi che ti ho prestato, give me back the money I lent you; rendere la libertà a qlcu., to set s.o. free (o to restore s.o. to liberty); rendere la vista ai ciechi, to make the blind see // rendere l'anima a Dio, to breathe one's last (o to give up the ghost) // (comm.): a rendere, returnable (o non-disposable); vuoto a rendere, returnable container (o empties to be returned)2 ( contraccambiare) to render, to return, to repay: all'occasione ti renderò il servizio, when the opportunity arises I'll repay your kindness; rendere il saluto a qlcu., to return s.o.'s greeting; rendere una visita, to return a visit // a buon rendere, my turn next time // Dio te ne renda merito, God bless you for it; Dio te ne renderà merito, God will reward you for it // quello che è fatto è reso, tit for tat // rendere bene per male, to render good for evil3 ( produrre) to return; to produce; ( fruttare) to yield, to bear*, to pay*: il burro rende più della margarina, butter goes farther (o further) than margarine; il lavoro non mi rende, my work is not very remunerative; quell'affare non rese molto, that business did not pay very well (o was not very profitable); quell'investimento non ha reso profitti, that investment has returned no profit; un'attività che rende, a profitable activity; questo impiegato non rende, this employee is not efficient (o gets very little done); questo terreno non rende, this land produces nothing; (fin.) questi titoli rendono il 10% di interesse, these securities yield (o bear) 10% interest4 ( dare, offrire) to render, to give*, to pay: rendere un servizio, to render a service; con tutti i servizi che ti ho reso..., with all the favours I have done you...; rendere le estreme onoranze a qlcu., to pay the last honours to s.o.; rendere giustizia a qlcu., to do s.o. justice (o to give s.o. his due); rendere lode, to praise (o to give praise); rendere omaggio a qlcu., to pay homage to s.o.; rendere gli onori militari, to present arms; rendere testimonianza, to bear witness // rendere le armi, to surrender (o to lay down one's arms), (fig.) to acknowledge oneself beaten // rendere conto di qlco., to give account of (o to account for) sthg.: devo rendere conto, ragione di tutto ciò che spendo, I must account (o give reasons) for all that I spend // rendere grazie, to give (o to render) thanks5 ( far diventare) to render, to make*: lo ha reso padre di un bellissimo bambino, she made him the father of a lovely baby boy; l'amore rende felici, love makes one happy; ciò rese inutili i nostri sforzi, this made our efforts useless; l'incremento dell'industria rese necessaria la costruzione di nuove fabbriche, the development of industry made the construction of new factories necessary; la notizia la rese felice, the news made her happy; rendere di pubblica ragione, to make public (o known) // (inform.): rendere attivo, to activate; rendere inutilizzabile, to disable // (fis. nucleare) rendere radioattivo, to activate6 ( esprimere, riprodurre) to render, to reproduce, to express: gli attori resero tutti i personaggi molto bene, the actors rendered all the characters very well; il pittore ha reso bene i tuoi lineamenti, the painter has portrayed (o reproduced o rendered) your features very well; questo romanzo rende molto vividamente i problemi del nostro tempo, this novel is a vivid picture of the problems of our times; rendere un'immagine, to represent (o to reproduce) an image; rendere pensieri, sentimenti, to express (o to convey) thoughts, feelings; hai reso perfettamente l'idea, you have made yourself perfectly clear (o you have conveyed the idea perfectly); rendo l'idea?, do you see what I mean?7 ( tradurre) to render, to translate: è molto difficile rendere la poesia in una lingua straniera, it is very difficult to render poetry in a foreign language.◘ rendersi v.rifl.1 to make* oneself; to become*: non bisogna rendere schiavi delle abitudini, one must not become a slave to one's habits; se lo fai ti renderai odioso a tutti, if you do it you'll make yourself hateful to everybody; rendere ridicolo, to make oneself ridiculous // rendere conto, to realize: mi resi conto che studiavo da dieci ore, I realized I had been studying ten hours; non si rende conto di quanto sia sciocco, he does not realize how silly he is; non so rendermi conto di come l'ho fatto, I cannot explain how I have done it3 (rar.) ( recarsi) to go; to proceed.* * *1. ['rɛndere]vb irreg vt1) (ridare) to give back, return"vuoto a rendere" — (bottiglia) "please return empties"
2)rendere grazie a qn — to thank sb3) (fruttare) to yield, bring in, (uso assoluto: sogg: ditta) to be profitable, (investimento, campo) to yield, be productiverendere il 10% — to yield 10%
4) (esprimere, tradurre) to render5) (+ agg: far diventare) to make2. vr (rendersi)(+ agg: apparire) to make o.s. + adjrendersi antipatico/ridicolo/utile — to make o.s. unpleasant/ridiculous/useful
* * *['rɛndere] 1.verbo transitivo1) (restituire) to give* back, to return [ oggetto prestato]; to give* back, to restore [ vista]; to give* back [ libertà]2) (ricambiare) to return [saluto, invito]3) (dare, tributare)rendere conto di qcs. a qcn. — to account for sth. to sb., to answer to sb. for sth.
rendere omaggio a qcn. — to pay homage o tribute to sb.
rendere giustizia a qcn. — to do sb. justice o justice to sb.
4) (fruttare) [ investimento] to yield [ denaro]le azioni rendono il 10% — the shares yield o return 10%
5) (esprimere) to render, to convey [sentimento, idea, atmosfera]6) (fare diventare) to make*, to renderrendere qcn. felice, celebre — to make sb. happy, famous
rendere qcs. possibile, difficile — to make sth. possible, difficult
2.rendere pubblico — to make [sth.] public [relazione, vita privata]; to make [sth.] known [verità, notizia]
1) (fruttare)3.rendere (bene) — [ terra] to be productive; [ coltura] to do well; [attività, commercio] to be profitable
verbo pronominale rendersi1) (diventare) to make* oneself2)- rsi conto di — to appreciate, to realize
- rsi conto che — to be o become aware that, to realize that
sì, me ne rendo conto — yes, I can appreciate that
* * *rendere/'rεndere/ [10]1 (restituire) to give* back, to return [ oggetto prestato]; to give* back, to restore [ vista]; to give* back [ libertà]2 (ricambiare) to return [saluto, invito]; a buon rendere! I owe you one!3 (dare, tributare) rendere conto di qcs. a qcn. to account for sth. to sb., to answer to sb. for sth.; rendere omaggio a qcn. to pay homage o tribute to sb.; rendere giustizia a qcn. to do sb. justice o justice to sb.; rendere grazie a Dio to say grace4 (fruttare) [ investimento] to yield [ denaro]; le azioni rendono il 10% the shares yield o return 10%; non rende niente it doesn't pay5 (esprimere) to render, to convey [sentimento, idea, atmosfera]; rendo l'idea? have I got it across?6 (fare diventare) to make*, to render; rendere qcn. felice, celebre to make sb. happy, famous; rendere qcs. possibile, difficile to make sth. possible, difficult; rendere pubblico to make [sth.] public [relazione, vita privata]; to make [sth.] known [verità, notizia](aus. avere)1 (fruttare) rendere (bene) [ terra] to be productive; [ coltura] to do well; [attività, commercio] to be profitable2 (dare un rendimento) a scuola non rende he's not getting on at school; rende meglio a colori it comes out better in colourIII rendersi verbo pronominale1 (diventare) to make* oneself; - rsi indispensabile to make oneself indispensable2 - rsi conto di to appreciate, to realize; - rsi conto che to be o become aware that, to realize that; sì, me ne rendo conto yes, I can appreciate that; ti rendi conto di quanto costa? do you realize how expensive that is? -
23 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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