journal+of+the+chemical+society

SUBJECT AREA: Chemical technology, Metallurgy

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MacArthur served his apprenticeship in the laboratory of Tennant's Tharsis Sulphur and Copper Company in Glasgow. In 1886 he was appointed Technical Manager of the Tennant-run Cassel Gold Extracting Company. By 1888 he was advocating a treatment scheme in which gold was dissolved from crushed rock by a dilute solution of alkali cyanide and then precipitated onto finely divided zinc. During the next few years, with several assistants, he was extremely active in promoting the new gold-extraction technique in various parts of the world. In 1894 significant sums in royalty payments were received, but by 1897 the patents had been successfully contested; henceforth the Cassel Company concentrated on the production and marketing of the essential sodium cyanide reagent.

MacArthur was Managing Director of the Cassel Company from 1892 to 1897; he resigned as a director in December 1905. In 1907 he created the Antimony Recovery Syndicate, and in 1911 he set up a small plant at Runcorn, Cheshire, to produce radium salts. In 1915 this radium-extraction activity was transferred to Balloch, south of Loch Lomond, where it was used until some years after his death.

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1 request.

demanda salarial wage claim

en demanda de asking for

2 demand (economics).

La ley de la oferta y la demanda the law of supply and demand.

3 lawsuit (law).

presentar una demanda contra to take legal action against

demanda de divorcio petition for a divorce

3^rd person singular (él/ella/ello) present indicative of spanish verb: demandar.

2^nd person singular (tú) Imperative of Spanish verb: demandar.

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► nombre femenino

1 (petición) petition, request

2 (pregunta) inquiry

3 COMERCIO (pedido de mercancías) demand

■ este verano la demanda de ventiladores ha aumentado this summer the demand for fans has increased

4 DERECHO lawsuit

\

en demanda de asking for

estimar una demanda to allow a claim

presentar una demanda contra alguien to take legal action against somebody

la ley de la oferta y la demanda the law of supply and demand

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1) demand

2) lawsuit

3) request

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1) (=solicitud) request (de for)

- morir en la demanda

2) esp LAm (=pregunta) inquiry

3) (Com) demand

4) (Teat) call

5) (Elec) load

6) (Jur) action, lawsuit

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1) (Com) demand

2)

a) (Der) lawsuit

b) ( petición) request

* * *

1) (Com) demand

2)

a) (Der) lawsuit

b) ( petición) request

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demanda¹

demanda²

² = appeal, plea, claim, demand.

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A ( Com) demand

la ley de la oferta y la demanda the law of supply and demand

un producto que tiene mucha demanda a product which is in great demand

días de mayor demanda days when demand is greatest

1 ( Der) lawsuit

ha presentado una demanda contra ellos he is suing them, he has brought a lawsuit against them

interponer una demanda to bring a lawsuit, to file suit ( AmE)

(petición): lo siento mucho, pero no puedo acceder a su demanda I am very sorry but I cannot agree to your request

plantearon su demanda al gobierno they presented their demands to the government

se volvió hacia ella en demanda de ayuda he turned to her for help

se manifestaron en demanda de mejores condiciones de trabajo they held a demonstration to demand o they demonstrated for better working conditions

me miró, como en demanda de una explicación she looked at me, as if asking for an explanation

C ( liter)

(empresa): morir or perecer en la demanda to die o ( frml) perish in the attempt

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3ª persona singular (él/ella/usted) presente indicativo

2ª persona singular (tú) imperativo

◊ tiene mucha demanda it's in great demand

a) (Der) lawsuit;

◊ presentar una demanda contra algn to bring a lawsuit against sb

b) ( petición) request;

◊ accedí a su demanda I agreed to his request

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demanda nf

1. [petición] request;

atender las demandas de los trabajadores to respond to the workers' demands;

en demanda de asking for;

irán a la huelga en demanda de una mejora salarial they will go on strike in support of their demands for better pay

demanda de empleo [solicitud] job application;

demanda de extradición extradition request;

demanda salarial wage claim

2. [en economía] demand;

hay mucha demanda de informáticos there is a great demand for computer specialists;

ha crecido la demanda de productos reciclables there has been an increase in demand for recyclable products;

la demanda de trabajo en el sector turístico es muy alta jobs in the tourist industry are in high demand;

la oferta y la demanda supply and demand

3. [en derecho] lawsuit;

interponer o [m5] presentar una demanda contra to take legal action against;

presenté una demanda contra la constructora por daños y perjuicios I sued the builders for damages;

una demanda por difamación a libel suit

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1 demand (de for);

en demanda de (asking) for

2 COM demand;

tener mucha demanda be very popular;

tiene poca demanda there’s not much demand for it, it’s not very popular

3 JUR lawsuit, claim;

presentar o

interponer una demanda contra alguien take legal action against s.o.

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demanda nf

1) : demand

la oferta y la demanda: supply and demand

2) : petition, request

3) : lawsuit

* * *

demanda n

1. (de productos) demand

2. (acción judicial) lawsuit

SUBJECT AREA: Metallurgy

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Brearley was born in poor circumstances. He received little formal education and was nurtured rather in and around the works of Thomas Firth \& Sons, where his father worked in the crucible steel-melting shop. One of his first jobs was to help in their chemical laboratory where the chief chemist, James Taylor, encouraged him and helped him fit himself for a career as a steelworks chemist.

In 1901 Brearley left Firth's to set up a laboratory at Kayser Ellison \& Co., but he returned to Firth's in 1904, when he was appointed Chief Chemist at their Riga works, and Works Manager the following year. In 1907 he returned to Sheffield to design and equip a research laboratory to serve both Firth's and John Brown \& Co. It was during his time as head of this laboratory that he made his celebrated discovery. In 1913, while seeking improved steels for rifle barrels, he used one containing 12.68 per cent chromium and 0.24 per cent carbon, in the hope that it would resist fouling and erosion. He tried to etch a specimen for microscopic examination but failed, from which he concluded that it would resist corrosion by, for example, the acids encountered in foods and cooking. The first knives made of this new steel were unsatisfactory and the 1914–18 war interrupted further research. But eventually the problems were overcome and Brearley's discovery led to a range of stainless steels with various compositions for domestic, medical and industrial uses, including the well-known "18–8" steel, with 18 per cent chromium and 8 per cent nickel.

In 1915 Brearley left the laboratory to become Works Manager, then Technical Director, at Brown Bayley's steelworks until his retirement in 1925.

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SUBJECT AREA: Electricity, Telecommunications

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Sent to stay with relatives at the age of 6 because of the illness of his father, when the latter died in 1811 Henry was apprenticed to a silversmith and then turned to the stage. Whilst he was ill himself, a book on science fired his interest and he began studying at Albany Academy, working as a tutor to finance his studies. Initially intending to pursue medicine, he then spent some time as a surveyor before becoming Professor of Mathematics and Natural Philosophy at Albany Academy in 1826. There he became interested in the improvement of electromagnets and discovered that the use of an increased number of turns of wire round the core greatly increased their power; by 1831 he was able to supply to Yale a magnet capable of lifting almost a ton weight. During this time he also discovered the principles of magnetic induction and self-inductance. In the same year he made, but did not patent, a cable telegraph system capable of working over a distance of 1 mile (1.6 km). It was at this time, too, that he found that adiabatic expansion of gases led to their sudden cooling, thus paving the way for the development of refrigerators. For this he was recommended for, but never received, the Copley Medal of the Royal Society. Five years later he became Professor of Natural Philosophy at New Jersey College (later Princeton University), where he deduced the laws governing the operation of transformers and observed that changes in magnetic flux induced electric currents in conductors. Later he also observed that spark discharges caused electrical effects at a distance. He therefore came close to the discovery of radio waves. In 1836 he was granted a year's leave of absence and travelled to Europe, where he was able to meet Michael Faraday. It was with his help that in 1844 Samuel Morse set up the first patented electric telegraph, but, sadly, the latter seems to have reaped all the credit and financial rewards. In 1846 he became the first secretary of the Washington Smithsonian Institute and did much to develop government support for scientific research. As a result of his efforts some 500 telegraph stations across the country were equipped with meteorological equipment to supply weather information by telegraph to a central location, a facility that eventually became the US National Weather Bureau. From 1852 he was a member of the Lighthouse Board, contributing to improvements in lighting and sound warning systems and becoming its chairman in 1871. During the Civil War he was a technical advisor to President Lincoln. He was a founder of the National Academy of Science and served as its President for eleven years.

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SUBJECT AREA: Metallurgy

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After a private education, Percy went to Paris in 1834 to study medicine and to attend lectures on chemistry by Gay-Lussac and Thenard. After 1838 he studied medicine at Edinburgh, obtaining his MD in 1839. In that year he was appointed Professor of Chemistry at Queen's College, Birmingham, moving to Queen's Hospital at Birmingham in 1843. During his time at Birmingham, Percy became well known for his analysis of blast furnace slags, and was involved in the manufacture of optical glass. On 7 June 1851 Percy was appointed Metallurgical Professor and Teacher at the Museum of Practical Geology established in Jermyn Street, London, and opened in May 1851. In November of 1851, when the Museum became the Government (later Royal) School of Mines, Percy was appointed Lecturer in Metallurgy. In addition to his work at Jermyn Street, Percy lectured on metallurgy to the Advanced Class of Artillery at Woolwich from 1864 until his death, and from 1866 he was Superintendent of Ventilation at the Houses of Parliament. He served from 1861 to 1864 on the Special Committee on Iron set up to examine the performance of armour-plate in relation to its purity, composition and structure.

Percy is best known for his metallurgical text books, published by John Murray. Volume I of Metallurgy, published in 1861, dealt with fuels, fireclays, copper, zinc and brass; Volume II, in 1864, dealt with iron and steel; a volume on lead appeared in 1870, followed by one on fuels and refractories in 1875, and the first volume on gold and silver in 1880. Further projected volumes on iron and steel, noble metals, and on copper, did not materialize. In 1879 Percy resigned from his School of Mines appointment in protest at the proposed move from Jermyn Street to South Kensington. The rapid growth of Percy's metallurgical collection, started in 1839, eventually forced him to move to a larger house. After his death, the collection was bought by the South Kensington (later Science) Museum. Now comprising 3,709 items, it provides a comprehensive if unselective record of nineteenth-century metallurgy, the most interesting specimens being those of the first sodium-reduced aluminium made in Britain and some of the first steel produced by Bessemer in Baxter House. Metallurgy for Percy was a technique of chemical extraction, and he has been criticized for basing his system of metallurgical instruction on this assumption. He stood strangely aloof from new processes of steel making such as that of Gilchrist and Thomas, and tended to neglect early developments in physical metallurgy, but he was the first in Britain to teach metallurgy as a discipline in its own right.

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сокр. от Журнал Русского физико-химического общества

SUBJECT AREA: Chemical technology

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It was intended that Weldon should enter his father's factory in Loughborough, but he decided instead to turn to journalism, which he pursued with varying success in London. His Weldon's Register of Facts and Occurrences in Literature, Science, and Art ran for only four years, from 1860 to 1864, but the fashion magazine Weldon's Journal, which he published with his wife, was more successful. Meanwhile Weldon formed an interest in chemistry, although he had no formal training in that subject. He devoted himself to solving one of the great problems of industrial chemistry at that time. The Leblanc process for the manufacture of soda produced large quantities of hydrochloric acid in gas form. By this time, this by-product was being converted, by oxidation with manganese dioxide, to chlorine, which was much used in the textile and paper industries as a bleaching agent. The manganese ended up as manganese chloride, from which it was difficult to convert back to the oxide, for reuse in treating the hydrochloric acid, and it was an expensive substance. Weldon visited the St Helens district of Lancashire, an important centre for the manufacture of soda, to work on the problem. During the three years from 1866 to 1869, he took out six patents for the regeneration of manganese dioxide by treating the manganese chloride with milk of lime and blowing air through it. The Weldon process was quickly adopted and had a notable economic effect: the price of bleaching powder came down by £6 per ton and production went up fourfold.

By the time of his death, nearly all chlorine works in the world used Weldon's process. The distinguished French chemist J.B.A.Dumas said of the process, when presenting Weldon with a gold medal, "every sheet of paper and every yard of calico has been cheapened throughout the world". Weldon played an active part in the founding of the Society of Chemical Industry.

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