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21 Davidson, Robert
[br]b. 18 April 1804 Aberdeen, Scotlandd. 16 November 1894 Aberdeen, Scotland[br]Scottish chemist, pioneer of electric power and builder of the first electric railway locomotives.[br]Davidson, son of an Aberdeen merchant, attended Marischal College, Aberdeen, between 1819 and 1822: his studies included mathematics, mechanics and chemistry. He subsequently joined his father's grocery business, which from time to time received enquiries for yeast: to meet these, Davidson began to manufacture yeast for sale and from that start built up a successful chemical manufacturing business with the emphasis on yeast and dyes. About 1837 he started to experiment first with electric batteries and then with motors. He invented a form of electromagnetic engine in which soft iron bars arranged on the periphery of a wooden cylinder, parallel to its axis, around which the cylinder could rotate, were attracted by fixed electromagnets. These were energized in turn by current controlled by a simple commutaring device. Electric current was produced by his batteries. His activities were brought to the attention of Michael Faraday and to the scientific world in general by a letter from Professor Forbes of King's College, Aberdeen. Davidson declined to patent his inventions, believing that all should be able freely to draw advantage from them, and in order to afford an opportunity for all interested parties to inspect them an exhibition was held at 36 Union Street, Aberdeen, in October 1840 to demonstrate his "apparatus actuated by electro-magnetic power". It included: a model locomotive carriage, large enough to carry two people, that ran on a railway; a turning lathe with tools for visitors to use; and a small printing machine. In the spring of 1842 he put on a similar exhibition in Edinburgh, this time including a sawmill. Davidson sought support from railway companies for further experiments and the construction of an electromagnetic locomotive; the Edinburgh exhibition successfully attracted the attention of the proprietors of the Edinburgh 585\& Glasgow Railway (E \& GR), whose line had been opened in February 1842. Davidson built a full-size locomotive incorporating his principle, apparently at the expense of the railway company. The locomotive weighed 7 tons: each of its two axles carried a cylinder upon which were fastened three iron bars, and four electromagnets were arranged in pairs on each side of the cylinders. The motors he used were reluctance motors, the power source being zinc-iron batteries. It was named Galvani and was demonstrated on the E \& GR that autumn, when it achieved a speed of 4 mph (6.4 km/h) while hauling a load of 6 tons over a distance of 1 1/2 miles (2.4 km); it was the first electric locomotive. Nevertheless, further support from the railway company was not forthcoming, although to some railway workers the locomotive seems to have appeared promising enough: they destroyed it in Luddite reaction. Davidson staged a further exhibition in London in 1843 without result and then, the cost of battery chemicals being high, ceased further experiments of this type. He survived long enough to see the electric railway become truly practicable in the 1880s.[br]Bibliography1840, letter, Mechanics Magazine, 33:53–5 (comparing his machine with that of William Hannis Taylor (2 November 1839, British patent no. 8,255)).Further Reading1891, Electrical World, 17:454.J.H.R.Body, 1935, "A note on electro-magnetic engines", Transactions of the Newcomen Society 14:104 (describes Davidson's locomotive).F.J.G.Haut, 1956, "The early history of the electric locomotive", Transactions of the Newcomen Society 27 (describes Davidson's locomotive).A.F.Anderson, 1974, "Unusual electric machines", Electronics \& Power 14 (November) (biographical information).—1975, "Robert Davidson. Father of the electric locomotive", Proceedings of the Meeting on the History of Electrical Engineering Institution of Electrical Engineers, 8/1–8/17 (the most comprehensive account of Davidson's work).A.C.Davidson, 1976, "Ingenious Aberdonian", Scots Magazine (January) (details of his life).PJGR / GW -
22 قام (وقف)، نهض، بنى
قَامَ (وَقَفَ)، نَهَضَ، بَنَى \ get up: to stand up: He got up from his chair. go up: to be built or put up: Many new houses are going up in our village. rise: to get up from a sitting or lying position: He rose to his feet (from the chair). stand up: to rise from a sitting position: The visitor stood up and walked out. stand, (stood): (of upright things) to be in a certain position: Some pots stood on the shelf., (often with up) to be on one’s feet: The seats were full, so we had to stand (up). \ قَامَ بِـ \ carry on: to control, keep in action: You can’t carry on a business without accounts. do: (used generally instead of a particular verb of action) to attend to; deal with; set in order: Have you done (or written) that report yet? Has the cook done (or prepared) the vegatables for dinner? Have you done (or cleaned) your teeth?. do: to perform (work, one’s duty etc.): I have a lot to do. have: to take: Do you have milk in your coffee?. in the process of: to be doing: I am in the process of painting my house. perform: to do (a duty, an action, etc.). \ See Also تناول (تَنَاوَل)، أنجز (أَنْجَزَ) \ قَامَ بالعمل \ function: to work: My radio isn’t functioning properly. \ قَامَ بتَجْرِبَة \ experiment: to try new ideas (esp. scientific ones): We were experimenting with a special kind of cotton seed. \ قَامَ بدور البُطُولة \ star: to be a leading performer: She is starring in a television show. \ قَامَ بِرِحْلَة \ tour: to make a tour: We toured (around) Europe for three weeks. \ قَامَ بزيارة \ pay a visit, to: to visit (as a duty, rather than for pleasure): I must pay a visit to the doctor. \ قَامَ بزيارة خاطفة \ look in: to pay a short visit: Do look in when you pass this way. \ قَامَ بِزيارَة شخص \ pay (sb.) a visit: to visit (sb.): I’ll pay you a visit when I next go to London. \ قَامَ بصيانة وإصْلاح آلة \ service: to give regular attention to (a machine): I have my car serviced every 6000 miles. \ See Also إلخ \ قَامَ بِعَمَله \ work: (of a machine, an idea, etc.) to do what it is meant to do; to be effective: This watch won’t work, as its spring is broken. Our plans worked smoothly. \ قَامَ بنزهة على الأقدام \ stretch one’s legs: to exercise one’s legs (after sitting for a long time); go for a walk. \ قَامَ بنفقة (أُسْرَة) \ support: to provide for: I have to support a large family. \ قَامَ بِهُجومٍ (جَويّ) مُفاجئ \ blitz: (to make) a sudden and violent attack, esp. by air. \ قَامَ على خِدْمَة... \ wait: (with on) to serve: Hotel servants wait on their guests. \ قَامَ على... \ base: to build on sth. or take it as a starting point: My story was based on true events. \ قَامَ مَقَام \ act for: to perform duties for: The headmaster is ill, and Mr Day is acting for him. stand for: (of signs, letters, etc.) to be instead of; mean: UK stands for United Kingdom. \ قَامَ بمظاهرة \ demonstrate: to show one’s feelings publicly, often with much noise and force: The farmers demonstrated against the control of meat prices. -
23 forevise
verb. exhibit, show (f.eks. ) verb. produce (f.eks.one's passport, railway ticket, ID card
) verb. present (fx ) verb. exhibit verb. demonstrate (f.eks. ) -
24 доказывать
•This establishes that xn is a Cauchy sequence.
* * *Доказывать -- to argue, to argue for, to demonstrate, to prove, to reason, to substantiateTests with an experimental machine have proved that this metering concept can be quite effective.Русско-английский научно-технический словарь переводчика > доказывать
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25 диапазон деятельности
Диапазон деятельности-- The brief outline of contributions to the development of this essential machine element will demonstrate the full spectrum of activity from analysis to design.Русско-английский научно-технический словарь переводчика > диапазон деятельности
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26 try
1. n разг. попытка2. n испытание, проба3. n выигрыш трёх очков при проходе игрока с мячом4. v пытаться, стараться5. v предпринимать, браться6. v стремиться7. v добиваться, искать8. v подвергать испытанию, пробовать; проверятьeach machine is tried before it leaves the shops — каждая машина проходит испытание перед выпуском с завода
try out — испытывать, опробовать; тщательно проверять
9. v проверять на опытеtry how far you can jump — попробуйте, на какое расстояние вы можете прыгнуть
10. v опробовать, экспериментально проверятьtry over — пробовать, испытывать
11. v пробовать; пытаться применять12. v утомлять; раздражать13. v испытывать14. v мучить, причинять страдания15. v допрашивать, расследовать16. v судить; привлекать к судебной ответственности17. v редк. исследовать, рассматриватьthis question must be tried by the judicial authority — этот вопрос подлежит рассмотрению судебных инстанций
18. v очищать; вытапливать19. v уст. отбирать; отделятьСинонимический ряд:1. attempt (noun) attempt; bid; effort; endeavor; endeavour; enterprise; essay; hassle; offer; striving; struggle; undertaking2. experiment (noun) experiment; sample; test; trial3. fling (noun) crack; fling; go; pop; shot; slap; stab; whack; whirl4. afflict (verb) afflict; agonize; crucify; excruciate; harrow; martyr; martyrize; rack; smite; strike; torment; torture; wring5. attempt (verb) aim; assay; attempt; endeavor; endeavour; essay; offer; put forth effort; seek; strive; struggle6. dare (verb) dare; undertake; venture7. distress (verb) distress; harass; irk; pain; strain; stress; tax; trouble8. judge (verb) decide; hear; judge; referee9. refine (verb) distil; distill; extract; melt; refine; render10. test (verb) assay; check; demonstrate; examine; investigate; prove; test; try outАнтонимический ряд:ignore; reject
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