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1 Arabic
1. aара́бскийold Arabic texts — стари́нные ара́бские те́ксты
2. nArabic numerals — ара́бские ци́фры
ара́бский язы́кthe translation from the Arabic — перево́д с ара́бского (языка́)
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2 Hero of Alexandria
SUBJECT AREA: Architecture and building, Mechanical, pneumatic and hydraulic engineering, Photography, film and optics, Steam and internal combustion engines[br]fl. c.62 AD Alexandria[br]Alexandrian mathematician and mechanician.[br]Nothing is known of Hero, or Heron, apart from what can be gleaned from the books he wrote. Their scope and style suggest that he was a teacher at the museum or the university of Alexandria, writing textbooks for his students. The longest book, and the one with the greatest technological interest, is Pneumatics. Some of its material is derived from the works of the earlier writers Ctesibius of Alexandria and Philo of Byzantium, but many of the devices described were invented by Hero himself. The introduction recognizes that the air is a body and demonstrates the effects of air pressure, as when air must be allowed to escape from a closed vessel before water can enter. There follow clear descriptions of a variety of mechanical contrivances depending on the effects of either air pressure or heated gases. Most of the devices seem trivial, but such toys or gadgets were popular at the time and Hero is concerned to show how they work. Inventions with a more serious purpose are a fire pump and a water organ. One celebrated gadget is a sphere that is set spinning by jets of steam—an early illustration of the reaction principle on which modern jet propulsion depends.M echanics, known only in an Arabic version, is a textbook expounding the theory and practical skills required by the architect. It deals with a variety of questions of mechanics, such as the statics of a horizontal beam resting on vertical posts, the theory of the centre of gravity and equilibrium, largely derived from Archimedes, and the five ways of applying a relatively small force to exert a much larger one: the lever, winch, pulley, wedge and screw. Practical devices described include sledges for transporting heavy loads, cranes and a screw cutter.Hero's Dioptra describes instruments used in surveying, together with an odometer or device to indicate the distance travelled by a wheeled vehicle. Catoptrics, known only in Latin, deals with the principles of mirrors, plane and curved, enunciating that the angle of incidence is equal to that of reflection. Automata describes two forms of puppet theatre, operated by strings and drums driven by a falling lead weight attached to a rope wound round an axle. Hero's mathematical work lies in the tradition of practical mathematics stretching from the Babylonians through Islam to Renaissance Europe. It is seen most clearly in his Metrica, a treatise on mensuration.Of all his works, Pneumatics was the best known and most influential. It was one of the works of Greek science and technology assimilated by the Arabs, notably Banu Musa ibn Shakir, and was transmitted to medieval Western Europe.[br]BibliographyAll Hero's works have been printed with a German translation in Heronis Alexandrini opera quae supersunt omnia, 1899–1914, 5 vols, Leipzig. The book on pneumatics has been published as The Pneumatics of Hero of Alexandria, 1851, trans. and ed. Bennet Wood-croft, London (facs. repr. 1971, introd. Marie Boas Hall, London and New York).Further ReadingA.G.Drachmann, 1948, "Ktesibios, Philon and Heron: A Study in Ancient Pneumatics", Acta Hist. Sci. Nat. Med. 4, Copenhagen: Munksgaard.T.L.Heath, 1921, A History of Greek Mathematics, Oxford (still useful for his mathematical work).LRD -
3 Apollonius of Perga
SUBJECT AREA: Architecture and building[br]b. c.240 BC Perga, Pamphylia, Greeced. 190 BC[br]Greek mathematician, geometer and astronomer.[br]Ruins of the ancient Greek city of Perga lie near to the Turkish town of Murtana, just inland from Antalya on the southern coast of Asia Minor. Apollonius, while quite young, went to Alexandria to study under the successors to Euclid. He also worked in Ephesus and Pergamum. He later carried out original studies into the geometrical proportions of conic sections, producing his famous work Conies and naming the ellipse, the parabola and the hyperbola. Conics, which appeared soon after 200 BC, consisted of eight treatises and earned him the name "the great geometer", given to him by his contemporaries. Seven of the eight treatises have survived, four in the original Greek and three in Arabic translation; a Latin translation was edited by Halley in 1710. Apollonius also published works on the cylindrical helix and theories of the epicycles and eccentrics, with reference to the motion of the planets.[br]Further ReadingG.J.Toomer, Apollonius: Conies, Berlin: Springer Verlag.DY -
4 al-Jazari, Ibn al-Razzaz
SUBJECT AREA: Horology[br]fl. c.1200 Arabia[br]Arab mechanician who constructed a series of ingenious water clocks with automata.[br]Al-Jazari entered the service of the Artuqid Kings of Diyar Bakir c.1180. In 1206 the then King, Nasir al-Din, instructed him to write a book describing the things he had constructed, among which were six water clocks. The timekeeping mechanism of these clocks was not innovative and was derived from earlier Hellenistic examples. Unlike Chinese and Hellenistic water clocks, al-Jazari's clocks had no astronomical indications and were intended to display the time, in temporal or unequal hours, both audibly and visually in an arresting and entertaining manner. The timekeeping was controlled by the flow of water from a vessel which contained a float to operate the clock mechanism. An ingenious device was used to ensure that the flow of water was constant during the day and could be set to a different constant flow during the night, to allow for the variation in the length of the temporal hours. Al-Jazari's clocks have not survived, but models have been constructed from the description and illustrations in the manuscripts.[br]Bibliography1206, The Book of Knowledge of Ingenious Mechanical Devices (an annotated translation by D.R.Hill was published in Dordrecht in 1974).Further ReadingD.R.Hill, 1979, The Country Life International Dictionary of Clocks, ed. Alan Smith, London, pp. 130, 135 (a very brief but more accessible account).——1981, Arabic Water-Clocks, Aleppo.DVBiographical history of technology > al-Jazari, Ibn al-Razzaz
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