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1 source
source [suʀs]feminine nouna. ( = point d'eau) spring• source thermale/d'eau minérale thermal/mineral springb. ( = foyer) source• source de chaleur/d'énergie source of heat/of energy• source lumineuse or de lumière light sourcec. cette rivière prend sa source dans le Massif central this river has its source in the Massif Central• de source sûre/officielle or autorisée from a reliable/an official source* * *suʀs1) ( d'eau) spring2) ( de cours d'eau) sourceprendre sa source dans or à — to rise in ou at
3) ( origine) sourceêtre une source de — to be a source of [conflits, ennuis, profits]
4) ( référence) sourceciter/vérifier ses sources — to give/to check one's sources
••* * *suʀs nf1) (= point d'eau) spring2) [cours d'eau] source3) [informations] sourcetenir qch de bonne source — to have sth on good authority, to have sth from a good source
4) [problèmes] source5) [énergie, chaleur] source* * *source nf1 ( d'eau) spring; capter/exploiter une source to tap/exploit a spring;2 ( de cours d'eau) source; prendre sa source dans or à to rise in, to have its source in; remonter à la source d'une rivière to follow a river to its source;3 ( origine) source; source de chaleur/revenus source of heat/income; la source du conflit the source of the conflict; être à la source de to be at the source of; être une source de to be a source of [conflits, ennuis, profits]; retenue à la source deduction at source;4 ( référence) source; citer/vérifier ses sources to give/to check one's sources; de bonne source, de source sûre [provenir, savoir, apprendre] from a reliable source; de source bien informée from a well-informed source; je tiens ces renseignements de source sûre my information comes from a reliable source.ça coule de source it's obvious; revenir aux sources to return to the roots; retour aux sources return to the roots.[surs] nom féminin1. [point d'eau] springoù la Seine prend-elle sa source? where is the source of the Seine?, where does the Seine originate?a. [d'un fleuve] to go upriver until one finds the sourceb. [d'une habitude, d'un problème] to go back to the rootà la source [au commencement] at the source, in the beginning3. [cause] sourcecette formulation peut être source de malentendus the way it's worded could give rise to misinterpretations4. PRESSEtenir ses renseignements de bonne source ou de source sûre ou de source bien informée to have information on good authoritynous savons ou tenons de source sûre que... we have it on good authority that..., we are reliably informed that...de source officielle/officieuse, on apprend que... official/unofficial sources reveal that...5. ÉLECTRICITÉ9. PHYSIQUEsource lumineuse ou de lumière light sourcesource de chaleur/d'énergie source of heat/energy, heat/energy source -
2 Smeaton, John
SUBJECT AREA: Civil engineering, Mechanical, pneumatic and hydraulic engineering, Steam and internal combustion engines[br]b. 8 June 1724 Austhorpe, near Leeds, Yorkshire, Englandd. 28 October 1792 Austhorpe, near Leeds, Yorkshire, England[br]English mechanical and civil engineer.[br]As a boy, Smeaton showed mechanical ability, making for himself a number of tools and models. This practical skill was backed by a sound education, probably at Leeds Grammar School. At the age of 16 he entered his father's office; he seemed set to follow his father's profession in the law. In 1742 he went to London to continue his legal studies, but he preferred instead, with his father's reluctant permission, to set up as a scientific instrument maker and dealer and opened a shop of his own in 1748. About this time he began attending meetings of the Royal Society and presented several papers on instruments and mechanical subjects, being elected a Fellow in 1753. His interests were turning towards engineering but were informed by scientific principles grounded in careful and accurate observation.In 1755 the second Eddystone lighthouse, on a reef some 14 miles (23 km) off the English coast at Plymouth, was destroyed by fire. The President of the Royal Society was consulted as to a suitable engineer to undertake the task of constructing a new one, and he unhesitatingly suggested Smeaton. Work began in 1756 and was completed in three years to produce the first great wave-swept stone lighthouse. It was constructed of Portland stone blocks, shaped and pegged both together and to the base rock, and bonded by hydraulic cement, scientifically developed by Smeaton. It withstood the storms of the English Channel for over a century, but by 1876 erosion of the rock had weakened the structure and a replacement had to be built. The upper portion of Smeaton's lighthouse was re-erected on a suitable base on Plymouth Hoe, leaving the original base portion on the reef as a memorial to the engineer.The Eddystone lighthouse made Smeaton's reputation and from then on he was constantly in demand as a consultant in all kinds of engineering projects. He carried out a number himself, notably the 38 mile (61 km) long Forth and Clyde canal with thirty-nine locks, begun in 1768 but for financial reasons not completed until 1790. In 1774 he took charge of the Ramsgate Harbour works.On the mechanical side, Smeaton undertook a systematic study of water-and windmills, to determine the design and construction to achieve the greatest power output. This work issued forth as the paper "An experimental enquiry concerning the natural powers of water and wind to turn mills" and exerted a considerable influence on mill design during the early part of the Industrial Revolution. Between 1753 and 1790 Smeaton constructed no fewer than forty-four mills.Meanwhile, in 1756 he had returned to Austhorpe, which continued to be his home base for the rest of his life. In 1767, as a result of the disappointing performance of an engine he had been involved with at New River Head, Islington, London, Smeaton began his important study of the steam-engine. Smeaton was the first to apply scientific principles to the steam-engine and achieved the most notable improvements in its efficiency since its invention by Newcomen, until its radical overhaul by James Watt. To compare the performance of engines quantitatively, he introduced the concept of "duty", i.e. the weight of water that could be raised 1 ft (30 cm) while burning one bushel (84 lb or 38 kg) of coal. The first engine to embody his improvements was erected at Long Benton colliery in Northumberland in 1772, with a duty of 9.45 million pounds, compared to the best figure obtained previously of 7.44 million pounds. One source of heat loss he attributed to inaccurate boring of the cylinder, which he was able to improve through his close association with Carron Ironworks near Falkirk, Scotland.[br]Principal Honours and DistinctionsFRS 1753.Bibliography1759, "An experimental enquiry concerning the natural powers of water and wind to turn mills", Philosophical Transactions of the Royal Society.Towards the end of his life, Smeaton intended to write accounts of his many works but only completed A Narrative of the Eddystone Lighthouse, 1791, London.Further ReadingS.Smiles, 1874, Lives of the Engineers: Smeaton and Rennie, London. A.W.Skempton, (ed.), 1981, John Smeaton FRS, London: Thomas Telford. L.T.C.Rolt and J.S.Allen, 1977, The Steam Engine of Thomas Newcomen, 2nd edn, Hartington: Moorland Publishing, esp. pp. 108–18 (gives a good description of his work on the steam-engine).LRD
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