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1 последующий том
Mathematics: successive volume -
2 следующий по порядку том
Polygraphy: successive volumeУниверсальный русско-английский словарь > следующий по порядку том
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3 Lartigue, Charles François Marie-Thérèse
[br]b. 1834 Toulouse, France d. 1907[br]French engineer and businessman, inventor of the Lartigue monorail.[br]Lartigue worked as a civil engineer in Algeria and while there invented a simple monorail for industrial or agricultural use. It comprised a single rail carried on trestles; vehicles comprised a single wheel with two tubs suspended either side, like panniers. These were pushed or pulled by hand or, occasionally, hauled by mule. Such lines were used in Algerian esparto-grass plantations.In 1882 he patented a monorail system based on this arrangement, with important improvements: traction was to be mechanical; vehicles were to have two or four wheels and to be able to be coupled together; and the trestles were to have, on each side, a light guide rail upon which horizontal rollers beneath the vehicles would bear. Early in 1883 the Lartigue Railway Construction Company was formed in London and two experimental prototype monorails were subsequently demonstrated in public. One, at the Paris Agricultural Exhibition, had an electric locomotive that was built in two parts, one either side of the rail to maintain balance, hauling small wagons. The other prototype, in London, had a small, steam locomotive with two vertical boilers and was designed by Anatole Mallet. By now Lartigue had become associated with F.B. Behr. Behr was Managing Director of the construction company and of the Listowel \& Ballybunion Railway Company, which obtained an Act of Parliament in 1886 to built a Lartigue monorail railway in the South West of Ireland between those two places. Its further development and successful operation are described in the article on Behr in this volume.A much less successful attempt to establish a Lartigue monorail railway took place in France, in the départment of Loire. In 1888 the council of the département agreed to a proposal put forward by Lartigue for a 10 1/2 mile (17 km) long monorail between the towns of Feurs and Panissières: the agreement was reached on the casting vote of the Chairman, a contact of Lartigue. A concession was granted to successive companies with which Lartigue was closely involved, but construction of the line was attended by muddle, delay and perhaps fraud, although it was completed sufficiently for trial trains to operate. The locomotive had two horizontal boilers, one either side of the track. But the inspectors of the department found deficiencies in the completeness and probable safety of the railway; when they did eventually agree to opening on a limited scale, the company claimed to have insufficient funds to do so unless monies owed by the department were paid. In the end the concession was forfeited and the line dismantled. More successful was an electrically operated Lartigue mineral line built at mines in the eastern Pyrenees.It appears to have reused equipment from the electric demonstration line, with modifications, and included gradients as steep as 1 in 12. There was no generating station: descending trains generated the electricity to power ascending ones. This line is said to have operated for at least two years.[br]Bibliography1882, French patent no. 149,301 (monorail system). 1882, British patent no. 2,764 (monorail system).Further ReadingD.G.Tucker, 1984, "F.B.Behr's development of the Lartigue monorail", Transactions of the Newcomen Society 55 (describes Lartigue and his work).P.H.Chauffort and J.-L.Largier, 1981, "Le monorail de Feurs à Panissières", Chemin defer régionaux et urbains (magazine of the Fédération des Amis des Chemins de FerSecondaires) 164 (in French; describes Lartigue and his work).PJGRBiographical history of technology > Lartigue, Charles François Marie-Thérèse
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4 Napier (Neper), John
SUBJECT AREA: Electronics and information technology[br]b. 1550 Merchiston Castle, Edinburgh, Scotlandd. 4 April 1617 Merchiston Castle, Edinburgh, Scotland[br]Scottish mathematician and theological writer noted for his discovery of logarithms, a powerful aid to mathematical calculations.[br]Born into a family of Scottish landowners, at the early age of 13 years Napier went to the University of St Andrews in Fife, but he apparently left before taking his degree. An extreme Protestant, he was active in the struggles with the Roman Catholic Church and in 1594 he dedicated to James VI of Scotland his Plaine Discovery of the Whole Revelation of St John, an attempt to promote the Protestant case in the guise of a learned study. About this time, as well as being involved in the development of military equipment, he devoted much of his time to finding methods of simplifying the tedious calculations involved in astronomy. Eventually he realized that by representing numbers in terms of the power to which a "base" number needed to be raised to produce them, it was possible to perform multiplication and division and to find roots, by the simpler processes of addition, substraction and integer division, respectively.A description of the principle of his "logarithms" (from the Gk. logos, reckoning, and arithmos, number), how he arrived at the idea and how they could be used was published in 1614 under the title Mirifici Logarithmorum Canonis Descriptio. Two years after his death his Mirifici Logarithmorum Canonis Constructio appeared, in which he explained how to calculate the logarithms of numbers and gave tables of them to eight significant figures, a novel feature being the use of the decimal point to distinguish the integral and fractional parts of the logarithm. As originally conceived, Napier's tables of logarithms were calculated using the natural number e(=2.71828…) as the base, not directly, but in effect according to the formula: Naperian logx= 107(log e 107-log e x) so that the original Naperian logarithm of a number decreased as the number increased. However, prior to his death he had readily acceded to a suggestion by Henry Briggs that it would greatly facilitate their use if logarithms were simply defined as the value to which the decimal base 10 needed to be raised to realize the number in question. He was almost certainly also aware of the work of Joost Burgi.No doubt as an extension of his ideas of logarithms, Napier also devised a means of manually performing multiplication and division by means of a system of rods known as Napier's Bones, a forerunner of the modern slide-rule, which evolved as a result of successive developments by Edmund Gunther, William Oughtred and others. Other contributions to mathematics by Napier include important simplifying discoveries in spherical trigonometry. However, his discovery of logarithms was undoubtedly his greatest achievement.[br]BibliographyNapier's "Descriptio" and his "Constructio" were published in English translation as Description of the Marvelous Canon of Logarithms (1857) and W.R.MacDonald's Construction of the Marvelous Canon of Logarithms (1889), which also catalogues all his works. His Rabdologiae, seu Numerationis per Virgulas Libri Duo (1617) was published in English as Divining Rods, or Two Books of Numbering by Means of Rods (1667).Further ReadingD.Stewart and W.Minto, 1787, An Account of the Life Writings and Inventions of John Napier of Merchiston (an early account of Napier's work).C.G.Knott (ed.), 1915, Napier Tercentenary Memorial Volume (the fullest account of Napier's work).KF
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