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21 necessary
necessary, US [transcription][-serI]A n2 ( needed thing) to do the necessary faire le nécessaire.C adj1 ( required) [arrangement, decision, information, skill] nécessaire ; [qualification] requis ; if necessary, as necessary si besoin est ; it is necessary that you do il vous faut faire ; ‘no experience necessary’ ‘aucune expérience requise’ ;2 ( essential) [action] nécessaire ; a necessary evil un mal nécessaire ; to become necessary devenir urgent ; to find it necessary to do éprouver le besoin de faire ; it is necessary for him to do il faut qu'il fasse ; it is necessary that she should do il faut vraiment qu'elle fasse ; to do what is necessary faire ce qui est nécessaire ; to do everything (that is) necessary faire tout ce qui est nécessaire ; when necessary quand cela sera nécessaire ; don't spend more time than is necessary n'y consacre pas plus de temps qu'il n'est nécessaire ; circumstances make it necessary for me to do les circonstances font que je dois faire ;3 ( inevitable) [consequence, result] nécessaire. -
22 typing
A n1 ( skill) dactylo f, dactylographie f ; to learn typing apprendre la dactylo ; ‘good typing essential’ Journ ‘bonne pratique de la dactylo essentielle’ ; my typing is slow ma frappe est lente ;2 ( typed material) two pages of typing deux pages dactylographiées ; check the typing vérifiez ce qui a été dactylographié ; I've got some typing to do j'ai quelque chose à taper ; she does academic typing elle tape des textes universitaires. -
23 basic
basic ['beɪsɪk]∎ these things are basic to a good marriage ces choses sont fondamentales ou vitales pour un mariage heureux∎ basic English anglais m de base;∎ a basic knowledge of Greek une connaissance de base du grec;∎ my French is a bit basic mon français est plutôt rudimentaire;∎ basic vocabulary vocabulaire m de base;∎ I've got the basic idea je vois de quoi il s'agit en gros;∎ Mathematics the four basic operations les quatre opérations fpl fondamentales(c) (essential) essentiel;∎ basic foodstuffs denrées fpl de base;∎ the basic necessities of life les besoins mpl vitaux;∎ basic precautions précautions fpl élémentaires ou essentielles(d) (primitive → furniture, accommodation, skills) rudimentaire;∎ their flat is really basic leur appartement est très rudimentaire(e) (as a starting point → hours) de base;∎ this is the basic model of the car voici la voiture dans son modèle de base∎ the basics l'essentiel m;∎ let's get down to basics venons-en à l'essentiel;∎ I learned the basics of computing j'ai acquis les notions de base en informatique;∎ they learned to cook with just the basics ils ont appris à faire la cuisine avec un minimum;∎ to get back to basics (important things in life) retourner aux choses essentielles;∎ Politics back to basics = expression qui suggère un retour aux valeurs traditionnelles en matière d'éducation ou de moralité, lancée par les Conservateurs comme argument de renouveau politique au début des années 90►► Economics basic commodity denrée f de base;Marketing basic consumer goods denrées fpl de consommation courante;Insurance basic cover assurance f de garantie de base;Finance basic pay salaire m de base;∎ most people are basic rate taxpayers la plupart des gens sont imposés au taux de base;Chemistry basic salt sel m basique;basic slag scorie f de déphosphoration;Finance basic wage salaire m de base -
24 Darby, Abraham
SUBJECT AREA: Metallurgy[br]b. 1678 near Dudley, Worcestershire, Englandd. 5 May 1717 Madely Court, Coalbrookdale, Shropshire, England[br]English ironmaster, inventor of the coke smelting of iron ore.[br]Darby's father, John, was a farmer who also worked a small forge to produce nails and other ironware needed on the farm. He was brought up in the Society of Friends, or Quakers, and this community remained important throughout his personal and working life. Darby was apprenticed to Jonathan Freeth, a malt-mill maker in Birmingham, and on completion of his apprenticeship in 1699 he took up the trade himself in Bristol. Probably in 1704, he visited Holland to study the casting of brass pots and returned to Bristol with some Dutch workers, setting up a brassworks at Baptist Mills in partnership with others. He tried substituting cast iron for brass in his castings, without success at first, but in 1707 he was granted a patent, "A new way of casting iron pots and other pot-bellied ware in sand without loam or clay". However, his business associates were unwilling to risk further funds in the experiments, so he withdrew his share of the capital and moved to Coalbrookdale in Shropshire. There, iron ore, coal, water-power and transport lay close at hand. He took a lease on an old furnace and began experimenting. The shortage and expense of charcoal, and his knowledge of the use of coke in malting, may well have led him to try using coke to smelt iron ore. The furnace was brought into blast in 1709 and records show that in the same year it was regularly producing iron, using coke instead of charcoal. The process seems to have been operating successfully by 1711 in the production of cast-iron pots and kettles, with some pig-iron destined for Bristol. Darby prospered at Coalbrookdale, employing coke smelting with consistent success, and he sought to extend his activities in the neighbourhood and in other parts of the country. However, ill health prevented him from pursuing these ventures with his previous energy. Coke smelting spread slowly in England and the continent of Europe, but without Darby's technological breakthrough the ever-increasing demand for iron for structures and machines during the Industrial Revolution simply could not have been met; it was thus an essential component of the technological progress that was to come.Darby's eldest son, Abraham II (1711–63), entered the Coalbrookdale Company partnership in 1734 and largely assumed control of the technical side of managing the furnaces and foundry. He made a number of improvements, notably the installation of a steam engine in 1742 to pump water to an upper level in order to achieve a steady source of water-power to operate the bellows supplying the blast furnaces. When he built the Ketley and Horsehay furnaces in 1755 and 1756, these too were provided with steam engines. Abraham II's son, Abraham III (1750–89), in turn, took over the management of the Coalbrookdale works in 1768 and devoted himself to improving and extending the business. His most notable achievement was the design and construction of the famous Iron Bridge over the river Severn, the world's first iron bridge. The bridge members were cast at Coalbrookdale and the structure was erected during 1779, with a span of 100 ft (30 m) and height above the river of 40 ft (12 m). The bridge still stands, and remains a tribute to the skill and judgement of Darby and his workers.[br]Further ReadingA.Raistrick, 1989, Dynasty of Iron Founders, 2nd edn, Ironbridge Gorge Museum Trust (the best source for the lives of the Darbys and the work of the company).H.R.Schubert, 1957, History of the British Iron and Steel Industry AD 430 to AD 1775, London: Routledge \& Kegan Paul.LRD -
25 Ward, Joshua
SUBJECT AREA: Chemical technology[br]b. 1685d. 21 November 1761 London, England[br]English doctor and industrial chemist.[br]Ward is perhaps better described as a "quack" than a medical doctor. His remedies, one containing a dangerous quantity of antimony, were dubious to say the least. A fraudulent attempt to enter Parliament in 1717 forced him to leave the country quickly. After his pardon in 1733, he returned to London and established a successful practice. His medical prowess is immortalized in Hogarth's picture The Harlot's Progress.Sulphuric acid had been an important chemical for centuries and Ward found that he needed large quantities of it to make his remedies. He set up works to manufacture it at Twickenham, near London, in 1736 and then at Richmond three years later. His process consisted of burning a mixture of saltpetre (nitre; potassium nitrate) and sulphur in the neck of a large glass globe containing a little water. Dilute sulphuric acid was thereby formed, which was concentrated by distillation. Although the method was not new, having been described in the seventeenth century by the German chemist Johann Glauber, Ward was granted a patent for his process in 1749. An important feature was the size of the globes, which had no less than fifty gallons' capacity, which must have entailed considerable skill on the part of the glassblowers. Through the adoption of Ward's process, the price of this essential commodity fell from £2 per pound to only 2 shillings. It provided the best method of manufacture until the advent of the lead-chamber process invented by John Roebuck.[br]Further ReadingA.Clow and N.Clow, 1952, The Chemical Revolution: A Contribution to Social Technology, London: Batch worth.C.Singer et al. (eds), 1958, A History of Technology, 7 vols, Oxford: Clarendon Press, Vol. IV.LRD
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