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81 internal
- internal-combustion - internal combustion - internal combustion turbine - internal crack - internal dimension of loading space - internal expanding brake - internal expanding shoes - internal leakage - internal member - internal resistance - internal rigity - internal splines - internal structure - internal teeth - internal toothing - internal work transport -
82 ratchet
храповой механизм; трещотка; защёлка; собачка; храповик; рачка; ряд храповых зубьев (на колесе или рейке); II нарезать храповые зубья; снабжать храповым механизмом; оснащать храповым механизмом; приводить в движение при помощи храпового механизма; останавливать при помощи храпового механизма- ratchet box - ratchet brace - ratchet closing device - ratchet cylinder - ratchet die stock - ratchet handle - ratchet hoist - ratchet latch - ratchet pattern - ratchet relay - ratchet reversible handle - ratchet screwing stock - ratchet spanner - ratchet wheel - ratchet winch - ratchet wrench - air ratchet - angle air ratchet - friction ratchet - hinged reversible ratchet - reversible ratchet for 1/2″ with oriented air exhaust - roller-type ratchet - simple ratchet with female square drive - simple ratchet with sliding square drive - step ratchet - ultra-compact reversible ratchet with rear air exhaust -
83 spiral
спираль; винтовая линия; винтовая поверхность; виток спирали; геликоидальная поверхность; змеевик; улитка; спиральная турбинная камера; II спиральный; геликоидальный; винтовой; спиралеобразный; винтовой; витой; косозубчатый; улиткообразный- spiral-cased turbine - spiral chute - spiral classifier - spiral-cutting head - spiral drawing frame - spiral drill - spiral drive - spiral drive planer - spiral drive planing machine - spiral end mill - spiral face inclination - spiral feeder - spiral filament - spiral fission chamber - spiral flow tank - spiral flute - spiral flute grinding fixture - spiral flute tap - spiral-fluted co - spiral fluted cutter - spiral fluted mill - spiral-fluted reamer - spiral-fluted tap - spiral four - spiral four cable - spiral-gash gear - spiral glow plug - spiral groove - spiral groove face seal - spiral-groove mating ring - spiral heat exchanger - spiral-helix - spiral hose - spiral index head - spiral lead - spiral micrometer - spiral-milling head - spiral motion - spiral not coaxial gear - spiral of Archimedes - spiral orbit spectrometer - spiral path - spiral pattern disk - spiral pinion - spiral pinion shaft - spiral pipe - spiral-plate - spiral-plate heat exchanger - spiral point - spiral point angle - spiral point drill - spiral point tap - pointed tap - spiral ratchet screwdriver - spiral reinforcement - spiral-rolled drill steel - spiral roller - spiral screw - spiral scroll - spiral-sector cyclotron - spiral spring suspension - spiral staircase - spiral step - spiral store - spiral tooth - spiral tube - spiral turn - spiral valve - spiral vortex - spiral waterway - spiral waveguide - spiral-welded pipe - spiral wheel - spiral winding - spiral wire reinforced rubber hose - Archimedian spiral - conical spiral - continuous spiral similarity - double spiral - fast spiral - hyperbolic spiral - left-hand tooth spiral - lead-in spiral - multiturn spiral - quality spiral - reciprocal spiral - right-hand tooth spiral - roller spiral - sinusoidal spiral - spherical spiral - steep spiral -
84 toothed
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85 toothed
1. a имеющий зубы2. a зубчатый -
86 gear
A n1 ( equipment) matériel m ; climbing/fishing/gardening gear matériel d'alpinisme/de pêche/de jardinage ;2 ○ (personal possessions, stuff) affaires fpl ; don't leave your gear all over the place ne laisse pas tes affaires partout ;4 Aut vitesse f ; bottom ou first gear première vitesse ; to be in second/third gear être en seconde/troisième ; to change gear changer de vitesse ; to put a car in gear passer la vitesse ; you're not in gear tu es au point mort ; you're in the wrong gear tu n'as pas passé la bonne vitesse ; ‘keep in low gear’ ( on sign) ‘utilisez votre frein moteur’ ; to get (oneself) into gear for sth fig se préparer pour qch ;1 Aut changement m de vitesse ;2 Tech engrenage m.C vtr1 ( tailor) to be geared to ou towards sb/sth [course, policy, system, tax] s'adresser à qn/qch ; to be geared to ou towards doing être destiné à faire ;2 Aut, Tech ( provide with gearing) équiper [qch] d'un embrayage [car] ; équiper [qch] d'un engrenage [other machinery].■ gear up:▶ gear up se préparer ;▶ gear [sb] up préparer ; to be geared up to do être prêt pour faire ; to be geared up for être prêt pour [party, interview, trip]. -
87 mechanism
механизм; устройствоdoor(-actuating, -operating) mechanism — механизм привода створок [управления створками]
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88 Bell, Thomas
SUBJECT AREA: Paper and printing[br]fl. 1770–1785 Scotland[br]Scottish inventor of a calico printing machine with the design engraved on rollers.[br]In November 1770, John Mackenzie, owner of a bleaching mill, took his millwright Thomas Bell to Glasgow to consult with James Watt about problems they were having with the calico printing machine invented by Bell some years previously. Bell rolled sheets of copper one eighth of an inch (3 mm) thick into cyliders, and filled them with cement which was held in place by cast iron ends. After being turned true and polished, the cylinders were engraved; they cost about £10 each. The printing machines were driven by a water-wheel, but Bell and Mackenzie appeared to have had problems with the doctor blades which scraped off excess colour, and this may have been why they visited Watt.They had, presumably, solved the technical problems when Bell took out a patent in 1783 which describes him as "the Elder", but there are no further details about the man himself. The machine is described as having six printing rollers arranged around the top of the circumference of a large central bowl. In later machines, the printing rollers were placed all round a smaller cylinder. All of the printing rollers, each printing a different colour, were driven by gearing to keep them in register. The patent includes steel doctor blades which would have scraped excess colour off the printing rollers. Another patent, taken out in 1784, shows a smaller three-colour machine. The printing rollers had an iron core covered with copper, which could be taken off at pleasure so that fresh patterns could be cut as desired. Bell's machine was used at Masney, near Preston, England, by Messrs Livesey, Hargreaves, Hall \& Co in 1786. Although copper cylinders were difficult to make and engrave, and the soldered seams often burst, these machines were able to increase the output of the cheaper types of printed cloth.[br]Bibliography1783, patent no. 1,378 (calico printing machine with engraved copper rollers). 1784, patent no. 1,443 (three-colour calico printing machine).Further ReadingW.E.A.Axon, 1886, Annals of Manchester, Manchester (provides an account of the invention).R.L.Hills, 1970, Power in the Industrial Revolution, Manchester (provides a brief description of the development of calico printing).RLH -
89 Burgi, Jost
SUBJECT AREA: Horology[br]b. 28 February 1552 Lichtensteig, Switzerlandd. 31 January 1632 Kassel, Germany[br]Swiss clockmaker and mathematician who invented the remontoire and the cross-beat escapement, also responsible for the use of exponential notation and the calculation of tables of anti-logarithms.[br]Burgi entered the service of Duke William IV of Hesse in 1579 as Court Clockmaker, although he also assisted William with his astronomical observations. In 1584 he invented the cross-beat escapement which increased the accuracy of spring-driven clocks by two orders of magnitude. During the last years of the century he also worked on the development of geometrical and astronomical instruments for the Royal Observatory at Kassel.On the death of Duke Wilhelm in 1603, and with news of his skills having reached the Holy Roman Emperor Rudolph II, in 1604 he went to Prague to become Imperial Watchmaker and to assist in the creation of a centre of scientific activity, subsequently becoming Assistant to the German astronomer, Johannes Kepler. No doubt this association led to an interest in mathematics and he made significant contributions to the concept of decimal fractions and the use of exponential notation, i.e. the use of a raised number to indicate powers of another number. It is likely that he was developing the idea of logarithms at the same time (or possibly even before) Napier, for in 1620 he made his greatest contribution to mathematics, science and, eventually, engineering, namely the publication of tables of anti-logarithms.At Prague he continued the series of accurate clocks and instruments for astronomical measurements that he had begun to produce at Kassel. At that period clocks were very poor timekeepers since the controller, the foliot or balance, had no natural period of oscillation and was consequently dependent on the driving force. Although the force of the driving weight was constant, irregularities occurred during the transmission of the power through the train as a result of the poor shape and quality of the gearing. Burgi attempted to overcome this directly by superb craftsmanship and indirectly by using a remontoire. This device was wound at regular intervals by the main driving force and fed the power directly to the escape wheel, which impulsed the foliot. He also introduced the crossbeat escapement (a variation on the verge), which consisted of two coupled foliots that swung in opposition to each other. According to contemporary evidence his clocks produced a remarkable improvement in timekeeping, being accurate to within a minute a day. This improvement was probably a result of the use of a remontoire and the high quality of the workmanship rather than a result of the cross-beat escapement, which did not have a natural period of oscillation.Burgi or Prague clocks, as they were known, were produced by very few other makers and were supplanted shortly afterwards by the intro-duction of the pendulum clock. Burgi also produced superb clockwork-driven celestial globes.[br]Principal Honours and DistinctionsEnnobled 1611.BibliographyBurgi only published one book, and that was concerned with mathematics.Further ReadingL.von Mackensen, 1979, Die erste Sternwarte Europas mit ihren Instrumenten and Uhren—400 Jahre Jost Burgi in Kassel, Munich.K.Maurice and O.Mayr (eds), 1980, The Clockwork Universe, Washington, DC, pp. 87– 102.H.A.Lloyd, 1958, Some Outstanding Clocks Over 700 Years, 1250–1950, London. E.T.Bell, 1937, Men of Mathematics, London: Victor Gollancz.See also: Briggs, HenryKF / DV -
90 Ctesibius (Ktesibios) of Alexandria
[br]fl. c.270 BC Alexandria[br]Alexandrian mechanician and inventor.[br]Ctesibius made a number of inventions of great importance, which he described in his book Pneumatics, now lost. The Roman engineer and architect Vitruvius quoted extracts from Ctesibius' work in his De Architectura and tells us that Ctesibius was the son of a barber and that he arranged an adjustable mirror controlled by a lead counterweight descending in a cylinder. He noticed that the weight compressed the air, which could be released with a loud noise. That led him to realize that the air was a body or substance: by means of a cylinder and plunger, he went on to invent an air pump with valves. This he connected to the keyboard and rows of pipes of an organ. He also invented a force pump for water.Ctesibius also improved the clepsydra or water clock, which measured time by the fall of water level in a vessel as the water escaped through a hole in the bottom. The rate of flow varied as the level dropped, so Ctesibius interposed a cistern with an overflow pipe, enabling the water level to be maintained; there was thus a constant flow into a cylinder and the passage of time was indicated by a float with a pointer. He fitted a rack to the float which turned a toothed wheel, to activate bells, singing birds or other "toys". This is probably the first known use of toothed gearing.Ctesibius is credited with some other inventions of a military nature, such as a catapult, but it was his pumps that established a tradition in antiquity for mechanical invention using the pressure of the air and other fluids, stretching through Philo of Byzantium (c.150 BC) and Hero of Alexandria (c.62 AD) and on through Islam into medieval Western Europe.[br]Further ReadingA.G.Drachmann, 1948, Ktesibios, Philon and Heron: A Study in Ancient Pneumatics, Copenhagen: Munksgaard (Acta Hist. Sci. Nat. Med. 4).LRDBiographical history of technology > Ctesibius (Ktesibios) of Alexandria
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91 Laval, Carl Gustaf Patrik de
SUBJECT AREA: Agricultural and food technology, Electricity, Mechanical, pneumatic and hydraulic engineering, Steam and internal combustion engines[br]b. 9 May 1845 Orsa, Swedend. 2 February 1913 Stockholm, Sweden[br]Swedish inventor of an advanced cream separator and a steam turbine.[br]Gustaf de Laval was educated at the Stockholm Technical Institute and Uppsala University. He proved to have an unfailing vigour and variety in his inventive talent, for his interests ranged from electric lighting and electrometallurgy to aerodynamics. In the 1890s he employed over one hundred engineers to develop his inventions, but he was best known for two: the cream separator and a steam turbine. In 1877 he invented the high-speed centrifugal cream separator, which was probably the greatest advance in butter-making up to that time. By 1880 the separators were being successfully marketed all over the world, for they were quickly adopted in larger dairies where they effected enormous savings in labour and space. He followed this with various devices for the dairy industry, including a vacuum milking machine perfected in 1913. In c. 1882, de Laval invented a turbine on the principle of Hero's engine, but he quickly turned his attention to the impulse type, which was like Branca's, with a jet of steam impinging on a set of blades around the periphery of a wheel. He applied for a British patent in 1889. The steam was expanded in a single stage from the initial to the final pressure: to secure economy with the steam issuing at high velocity, the blades also had to rotate at high velocity. An early 5 hp (3.7 kW) turbine rotated at 30,000 rpm, so reduction gearing had to be introduced. Production started in Sweden in 1893 and in other countries at about the same time. In 1892 de Laval proposed employing one of his turbines of 15 hp (11 kW) in an experimental launch, but there is no evidence that it was ever actually installed in a vessel. However, his turbines were popular for powering electric generating sets for lighting textile mills and ships, and by 1900 were available in sizes up to 300 bhp (224 kW).[br]Bibliography1889, British patent no. 7,143 (steam turbine).Further ReadingT.Althin, 1943, Life of de Laval, Stockholm (a full biography).T.I.Williams (ed.), 1969, A Biographical Dictionary of Scientists, London: A. \& C. Black (contains a brief biography).R.M.Neilson, 1902, The Steam Turbine, London: Longmans, Green \& Co. (fully covers the development of de Laval's steam turbine).H.W.Dickinson, 1938, A Short History of the Steam Engine, Cambridge University Press (contains a short account of the development of the steam turbine).R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (contains a short account).RLHBiographical history of technology > Laval, Carl Gustaf Patrik de
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92 Richard of Wallingford, Abbot
SUBJECT AREA: Horology[br]b. 1291/2 Wallingford, Englandd. 23 May 1336 St Albans, Hertfordshire, England[br]English cleric, mathematician and astronomer who produced the earliest mechanical clock of which there is detailed knowledge.[br]Richard, the son of a blacksmith, was adopted by the Prior of Wallingford when his father died and educated at Oxford. He then joined the monastery at St Albans and was ordained as a priest in 1317. After a further period at Oxford studying mathematics and astronomy he returned to St Albans as Abbot in 1327. Shortly after he had been elected Abbot he started work on a very elaborate astronomical clock. The escapement and the striking mechanism of this clock were unusual. The former was a variation on the verge escapement, and the hour striking (up to twenty-four) was controlled by a series of pins laid out in a helical pattern on a drum. However, timekeeping was of secondary importance as the main purpose of the clock was to show the motion of the Sun, Moon and planets (the details of the planet mechanism are lost) and to demonstrate eclipses. This was achieved in a very precise manner by a series of ingenious mechanisms, such as the elliptical wheel that was used to derive the variable motion of the sun.Richard died of leprosy, which he had contracted during a visit to obtain papal confirmation of his appointment, and the clock was completed after his death. The last recorded reference to it was made by John Leyland, shortly before the dissolution of the monasteries. It is now known only from incomplete manuscript copies of Richard's treatise. A modern reconstruction has been made based upon J.D.North's interpretation of the manuscript.[br]BibliographyFor the drafts of Richard's Treatise on the Clock, with translation and commentary, see J.D.North, 1976, Richard of Wallingford, 3 vols, Oxford.Further ReadingSee J.D.North's definitive work above: for biographical information see Vol. 2, pp. 1–16. Most of the shorter accounts appeared before the publication of North's treatise and are therefore of more limited use.G.White, 1978, "Evolution of the epicyclic gear—part 2", Chartered Mechanical Engineer (April): 85–8 (an account of Richard's use of epicyclic gearing).DVBiographical history of technology > Richard of Wallingford, Abbot
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