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1 clockmaking
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2 clockmaking
adj.de fabricación de relojes, de confección de relojes.s.fabricación de relojes, relojería. -
3 relojería
relojería sustantivo femenino (tienda, taller) clockmaker's, watchmaker's; ( actividad) watchmaking
relojería sustantivo femenino
1 (tienda) clock and watch shop
2 (taller) watchmaker's, clockmaker's
3 (técnica) clockmaking, watchmaking Locuciones: de relojería, clockwork
bomba de relojería, time bomb: esa reconversión industrial es una bomba de relojería, this industrial rationalization is a time-bomb ' relojería' also found in these entries: English: clockwork - spring - time bomb - timing mechanism - clock - time -
4 scape
scape [skeɪp]►► scape wheel (in clockmaking) roue f de rencontre -
5 Bain, Alexander
[br]b. October 1810 Watten, Scotlandd. 2 January 1877 Kirkintilloch, Scotland[br]Scottish inventor and entrepreneur who laid the foundations of electrical horology and designed an electromagnetic means of transmitting images (facsimile).[br]Alexander Bain was born into a crofting family in a remote part of Scotland. He was apprenticed to a watchmaker in Wick and during that time he was strongly influenced by a lecture on "Heat, sound and electricity" that he heard in nearby Thurso. This lecture induced him to take up a position in Clerkenwell in London, working as a journeyman clockmaker, where he was able to further his knowledge of electricity by attending lectures at the Adelaide Gallery and the Polytechnic Institution. His thoughts naturally turned to the application of electricity to clockmaking, and despite a bitter dispute with Charles Wheatstone over priority he was granted the first British patent for an electric clock. This patent, taken out on 11 January 1841, described a mechanism for an electric clock, in which an oscillating component of the clock operated a mechanical switch that initiated an electromagnetic pulse to maintain the regular, periodic motion. This principle was used in his master clock, produced in 1845. On 12 December of the same year, he patented a means of using electricity to control the operation of steam railway engines via a steam-valve. His earliest patent was particularly far-sighted and anticipated most of the developments in electrical horology that occurred during the nineteenth century. He proposed the use of electricity not only to drive clocks but also to distribute time over a distance by correcting the hands of mechanical clocks, synchronizing pendulums and using slave dials (here he was anticipated by Steinheil). However, he was less successful in putting these ideas into practice, and his electric clocks proved to be unreliable. Early electric clocks had two weaknesses: the battery; and the switching mechanism that fed the current to the electromagnets. Bain's earth battery, patented in 1843, overcame the first defect by providing a reasonably constant current to drive his clocks, but unlike Hipp he failed to produce a reliable switch.The application of Bain's numerous patents for electric telegraphy was more successful, and he derived most of his income from these. They included a patent of 12 December 1843 for a form of fax machine, a chemical telegraph that could be used for the transmission of text and of images (facsimile). At the receiver, signals were passed through a moving band of paper impregnated with a solution of ammonium nitrate and potassium ferrocyanide. For text, Morse code signals were used, and because the system could respond to signals faster than those generated by hand, perforated paper tape was used to transmit the messages; in a trial between Paris and Lille, 282 words were transmitted in less than one minute. In 1865 the Abbé Caselli, a French engineer, introduced a commercial fax service between Paris and Lyons, based on Bain's device. Bain also used the idea of perforated tape to operate musical wind instruments automatically. Bain squandered a great deal of money on litigation, initially with Wheatstone and then with Morse in the USA. Although his inventions were acknowledged, Bain appears to have received no honours, but when towards the end of his life he fell upon hard times, influential persons in 1873 secured for him a Civil List Pension of £80 per annum and the Royal Society gave him £150.[br]Bibliography1841, British patent no. 8,783; 1843, British patent no. 9,745; 1845, British patent no.10,838; 1847, British patent no. 11,584; 1852, British patent no. 14,146 (all for electric clocks).1852, A Short History of the Electric Clocks with Explanation of Their Principles andMechanism and Instruction for Their Management and Regulation, London; reprinted 1973, introd. W.Hackmann, London: Turner \& Devereux (as the title implies, this pamphlet was probably intended for the purchasers of his clocks).Further ReadingThe best account of Bain's life and work is in papers by C.A.Aked in Antiquarian Horology: "Electricity, magnetism and clocks" (1971) 7: 398–415; "Alexander Bain, the father of electrical horology" (1974) 9:51–63; "An early electric turret clock" (1975) 7:428–42. These papers were reprinted together (1976) in A Conspectus of Electrical Timekeeping, Monograph No. 12, Antiquarian Horological Society: Tilehurst.J.Finlaison, 1834, An Account of Some Remarkable Applications of the Electric Fluid to the Useful Arts by Alexander Bain, London (a contemporary account between Wheatstone and Bain over the invention of the electric clock).J.Munro, 1891, Heroes of the Telegraph, Religious Tract Society.J.Malster \& M.J.Bowden, 1976, "Facsimile. A Review", Radio \&Electronic Engineer 46:55.D.J.Weaver, 1982, Electrical Clocks and Watches, Newnes.T.Hunkin, 1993, "Just give me the fax", New Scientist (13 February):33–7 (provides details of Bain's and later fax devices).See also: Bakewell, Frederick C.DV / KF -
6 Junghans, Siegfried
SUBJECT AREA: Metallurgy[br]b. 1887d. 1954[br]German pioneer of the continuous casting of metals.[br]Junghans was of the family that owned Gebrüder Junghans, one of the largest firms in the German watch-and clockmaking industry. From 1906 to 1918 he served in the German Army, after which he took a course in metallurgy and analytical chemistry at the Technical High School in Stuttgart. Junghans was then given control of the brassworks owned by his family. He wanted to make castings simply and cheaply, but he found that he lacked the normal foundry equipment. By 1927, formulating his ideas on continuous casting, he had conceived a way of overcoming this deficiency and began experiments. By the time the firm was taken over by Wieland-Werke AG in 1931, Junghans had achieved positive results. A test plant was erected in 1932, and commercial production of continuously cast metal followed the year after. Wieland told Junghans that a brassfounder who had come up through the trade would never have hit on the idea: it took an outsider like Junghans to do it. He was made Technical Director of Wielands but left in 1935 to work privately on the development of continuous casting for all metals. He was able to license the process for non-ferrous metals during 1936–9 in Germany and other countries, but the Second World War interrupted his work; however, the German government supported him and a production plant was built. In 1948 he was able to resume work on the continuous casting of steel, which he had been considering since 1936. He pushed on in spite of financial difficulties and produced the first steel by this process at Schorndorf in March 1949. From 1950 he made agreements with four firms to work towards the pilot plant stage, and this was achieved in 1954 at Mannesmann's Huckingen works. The aim of continuous casting is to bypass the conventional processes of casting molten steel into ingots, reheating the ingots and shaping them by rolling them in a large mill. Essentially, in continuous casting, molten steel is drawn through the bottom of a ladle and down through a water-cooled copper mould. The unique feature of Junghans's process was the vertically reciprocating mould, which prevented the molten metal sticking as it passed through. A continuous length of steel is taken off and cooled until it is completely solidified into the required shape. The idea of continuous casting can be traced back to Bessemer, and although others tried to apply it later, they did not have any success. It was Junghans who, more than anybody, made the process a reality.[br]Further ReadingK.Sperth and A.Bungeroth, 1953, "The Junghans method of continuous casting of steel", Metal Treatment and Drop Forging, Mayn.J.Jewkes et al., 1969, The Sources of Invention, 2nd edn, London: Macmillan, pp. 287 ff.LRD -
7 Wasborough, Matthew
SUBJECT AREA: Steam and internal combustion engines[br]b. 1753 Bristol, Englandd. 21 October 1781 Bristol, England[br]English patentee of an application of the flywheel to create a rotative steam engine.[br]A single-cylinder atmospheric steam engine had a power stroke only when the piston descended the cylinder: a means had to be found of returning the piston to its starting position. For rotative engines, this was partially solved by the patent of Matthew Wasborough in 1779. His father was a partner in a Bristol brass-founding and clockmaking business in Narrow Wine Street where he was joined by his son. Wasborough proposed to use some form of ratchet gear to effect the rotary motion and added a flywheel, the first time one was used in a steam engine, "in order to render the motion more regular and uniform". He installed one engine to drive the lathes in the Bristol works and another at James Pickard's flour mill at Snow Hill, Birmingham, where Pickard applied his recently patented crank to it. It was this Wasborough-Pickard engine which posed a threat to Boulton \& Watt trying to develop a rotative engine, for Wasborough built several engines for cornmills in Bristol, woollen mills in Gloucestershire and a block factory at Southampton before his early death. Matthew Boulton was told that Wasborough was "so intent upon the study of engines as to bring a fever on his brain and he dyed in consequence thereof…. How dangerous it is for a man to wade out of his depth" (Jenkins 1936:106).[br]Bibliography1779, British patent no. 1,213 (rotative engine with flywheel).Further ReadingJ.Tann, 1978–9, "Makers of improved Newcomen engines in the late 18th century, and R.A.Buchanan", 1978–9, "Steam and the engineering community in the eighteenth century", Transactions of the Newcomen Society 50 ("Thomas Newcomen. A commemorative symposium") (both papers discuss Wasborough's engines).R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (examines his patent).R.Jenkins (ed.), 1936, Collected Papers, 106 (for Matthew Boulton's letter of 30 October 1781).RLH -
8 Zhang Sixun (Chang Ssu-Hsun)
SUBJECT AREA: Horology[br]b. fl. late 10th century[br]Chinese astronomer and clockmaker who built the earliest recorded astronomical clock tower with a hydromechanical escapement.[br]Most clepsydra clocks, such as that of al-Jarazi, measured time continuously by the constant flow of a liquid and most mechanical clocks measure time discontinuously by means of an escapement. The clepsydra clock devised by Zhang Sixun in 976 and completed in 979 was unusual as it incorporated an escapement. It consisted of a large wheel with buckets around its periphery. A constant stream of water was directed into one of the buckets until it reached a predetermined weight, this released the wheel, allowing it to rotate to a new position where the process was repeated (this mechanism may have been introduced by the Chinese astronomer and mathematician Zhang Heng in the second century). The water was later replaced by mercury to prevent freezing in winter. With suitable gearing the movement of the wheel was used to drive a celestial globe, a carousel for written time announcements and jacks for audible time signals. This clock has not survived and is known only from the work Hsin I Hsiang Fa Yao (New Armillary Sphere and Celestial Globe System Essentials), which was printed in 1172 and is ascribed to Su Song. This work also describes two similar but later astronomical clock towers with water-wheel escape-ments. Several models of the water-wheel escapement have been constructed from the description in this work.[br]Further ReadingJ.Needham (ed.), 1965, Science and Civilisation in China Vol. IV.2, Cambridge: Cambridge University Press: 38, 111, 165, 463, 469–71, 490, 524, 527–8, 533, 540.J.H.Combridge, 1975, "The astronomical clocktowers of Chang Ssu-Hsun and his successors, A.D. 976 to 1126", Antiquarian Horology 9: 288–301.J.Needham, Wang Ling and J.de Solla Price, 1986, Heavenly Clockwork. The Great Astronomical Clocks of Medieval China (2nd edn with supplement by J.H.Combridge), London (for a broader view of Chinese horology).J.H.Combridge, 1979, "Clockmaking in China", in The Country Life International Dictionary of Clocks, ed. Alan Smith, London.DVBiographical history of technology > Zhang Sixun (Chang Ssu-Hsun)
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9 lead
I[led] n կապար, արճիճ. white lead կա պարային սպիտականերկ. red lead կարմրադեղII[li:d] n ղեկավարություն, նա խա ձեռնու թյուն. առաջին, առաջատար տեղը. էլ. լար, հաղորդալար. be in the/take the lead առաջ նորդել, նախաձեռնությունը իր ձեռքը վերց նել. be still in the lead շարունակել առաջնորդել. lose the lead կորցնել առաջնությունը. It’s your lead թղթխ. Ձեր հերթն է/խաղն է. play the lead թատր. գլխավոր դերը կատարել. take the lead նախաձեռնությունը իր վրա վերցնել. give the police a lead ոստիկանությանը հետքի վրա դուրս բերել. lead country առաջատար երկիր. follow the lead օրինակին հետևել. give smb a lead օրինակ ցույց տալ. (շան վզափոկ) The dog was on a lead Շունը վզակապով էր[li:d] v տանել, վարել, առաջնորդել. lead along the road/through the forest/to the manager փո ղոցի երկայնքով/անտառի մի ջով/տնօրեն ի մոտ տանել. lead the way առջևից գնալ, հետևից տանել. lead by the hand ձեռքից բռնած տանել. lead nowhere ոչ մի տեղ չտանել. որևէ արդյունքի չբերել. (առաջնորդել, ղեկա վարել) lead the expedition/the army ար շա վա խումբը/բանակը ղեկավարել. lead the proces sion/ crowd թափորի/ամբոխի առջևից գնալ. (առջևում լինել) lead by ten points տասը միավորով առաջ լինել. The Swiss lead the field in clockmaking Շվեյցարական ֆիրմաները առաջնոր դող տեղ են գրավում ժամագործության մեջ. (բերել, հանգեցնել) lead to crime հան ցագոր ծության բերել. lead to a conclusion եզրակա ցության հանգեցնել. lead to success հաջողու թյան բերել. (վարել) lead a quiet life հանգիստ կյանք վարել. lead double life երկակի կյանք վարել. lead hearts թղթխ. փոսիկից գնալ/քայլ անել. (տանել) The road leads to the village Ճանապարհը (դեպի) գյուղ է տանում. lead to nothing փխբ. ոչնչի չբերել/չհասցնել. lead away տանել, հեռացնել. lead back հետ բե րել/տանել. This leads us back Սա մեզ վե րադարձնում է. lead off սկսել, բացել. lead out դուրս բերել. lead up մի բանի հասցնել
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