technical+changes

бирж. технический анализ (прогнозирование движения цен исключительно на основе анализа графиков изменения цен и объемов торговли для выявления и предугадывания повторяемости (чартизм); не имеет теоретической основы; большинство финансовых теорий утверждают, что технический анализ не может принести прибыли на эффективном рынке)

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технические руководства МОК
Технические руководства определяют подробные технические обязанности оргкомитетов Олимпийских игр. Эти документы содержат информацию о планировании, процедурах и процессах, а также проверенную практику, относящуюся к той или иной функции организации Игр. Они могут также содержать информацию, ориентированную на клиентов или Олимпийские объекты, относящуюся к данной функции. При необходимости в Технические руководства вносятся изменения после проведения каждых Игр. Существенные изменения и их содержание должны быть утверждены не позднее чем в течение 6 месяцев после проведения Игр. Технические руководства тесно связаны с другими основными документами МОК, такими, как Контракт о городе-организаторе и Олимпийская хартия.
[Департамент лингвистических услуг Оргкомитета «Сочи 2014». Глоссарий терминов]

EN

IOC technical manuals (TM)
Technical Manuals provide detailed technical obligations for the Olympic Games organizing committees. These documents contain planning information, procedures and processes, as well as proven practices regarding a function of the Games organization. They may also contain client or venue oriented information relevant to the function. Technical Manuals are modified when necessary after each edition of the Games. Substantial changes to their content should be approved no later than 6 months after the Games. Technical Manuals relate closely to other key IOC documents, such as the Host City Contract and the Olympic Charter.
[Департамент лингвистических услуг Оргкомитета «Сочи 2014». Глоссарий терминов]

Тематики

• спорт (управление Играми)

EN

• IOC technical manuals (TM)

1. n

1) перемена, изменение; замена

2) размен (денег); обмен, перевод, пересчет (на другую валюту)

3) сдача

4) мелочь, мелкие деньги

5) биржа

2. v

1) менять, изменять; меняться, изменяться

2) обменивать

   Portugal's economy, under the influence of the European Economic Community (EEC), and later with the assistance of the European Union (EU), grew rapidly in 1985-86; through 1992, the average annual growth was 4-5 percent. While such growth rates did not last into the late 1990s, portions of Portugal's society achieved unprecedented prosperity, although poverty remained entrenched. It is important, however, to place this current growth, which includes some not altogether desirable developments, in historical perspective. On at least three occasions in this century, Portugal's economy has experienced severe dislocation and instability: during the turbulent First Republic (1911-25); during the Estado Novo, when the world Depression came into play (1930-39); and during the aftermath of the Revolution of 25 April, 1974. At other periods, and even during the Estado Novo, there were eras of relatively steady growth and development, despite the fact that Portugal's weak economy lagged behind industrialized Western Europe's economies, perhaps more than Prime Minister Antônio de Oliveira Salazar wished to admit to the public or to foreigners.

   For a number of reasons, Portugal's backward economy underwent considerable growth and development following the beginning of the colonial wars in Africa in early 1961. Recent research findings suggest that, contrary to the "stagnation thesis" that states that the Estado Novo economy during the last 14 years of its existence experienced little or no growth, there were important changes, policy shifts, structural evolution, and impressive growth rates. In fact, the average annual gross domestic product (GDP) growth rate (1961-74) was about 7 percent. The war in Africa was one significant factor in the post-1961 economic changes. The new costs of finance and spending on the military and police actions in the African and Asian empires in 1961 and thereafter forced changes in economic policy.

   Starting in 1963-64, the relatively closed economy was opened up to foreign investment, and Lisbon began to use deficit financing and more borrowing at home and abroad. Increased foreign investment, residence, and technical and military assistance also had effects on economic growth and development. Salazar's government moved toward greater trade and integration with various international bodies by signing agreements with the European Free Trade Association and several international finance groups. New multinational corporations began to operate in the country, along with foreign-based banks. Meanwhile, foreign tourism increased massively from the early 1960s on, and the tourism industry experienced unprecedented expansion. By 1973-74, Portugal received more than 8 million tourists annually for the first time.

   Under Prime Minister Marcello Caetano, other important economic changes occurred. High annual economic growth rates continued until the world energy crisis inflation and a recession hit Portugal in 1973. Caetano's system, through new development plans, modernized aspects of the agricultural, industrial, and service sectors and linked reform in education with plans for social change. It also introduced cadres of forward-looking technocrats at various levels. The general motto of Caetano's version of the Estado Novo was "Evolution with Continuity," but he was unable to solve the key problems, which were more political and social than economic. As the boom period went "bust" in 1973-74, and growth slowed greatly, it became clear that Caetano and his governing circle had no way out of the African wars and could find no easy compromise solution to the need to democratize Portugal's restive society. The economic background of the Revolution of 25 April 1974 was a severe energy shortage caused by the world energy crisis and Arab oil boycott, as well as high general inflation, increasing debts from the African wars, and a weakening currency. While the regime prescribed greater Portuguese investment in Africa, in fact Portuguese businesses were increasingly investing outside of the escudo area in Western Europe and the United States.

   During the two years of political and social turmoil following the Revolution of 25 April 1974, the economy weakened. Production, income, reserves, and annual growth fell drastically during 1974-76. Amidst labor-management conflict, there was a burst of strikes, and income and productivity plummeted. Ironically, one factor that cushioned the economic impact of the revolution was the significant gold reserve supply that the Estado Novo had accumulated, principally during Salazar's years. Another factor was emigration from Portugal and the former colonies in Africa, which to a degree reduced pressures for employment. The sudden infusion of more than 600,000 refugees from Africa did increase the unemployment rate, which in 1975 was 10-15 percent. But, by 1990, the unemployment rate was down to about 5-6 percent.

   After 1985, Portugal's economy experienced high growth rates again, which averaged 4-5 percent through 1992. Substantial economic assistance from the EEC and individual countries such as the United States, as well as the political stability and administrative continuity that derived from majority Social Democratic Party (PSD) governments starting in mid-1987, supported new growth and development in the EEC's second poorest country. With rapid infrastruc-tural change and some unregulated development, Portugal's leaders harbored a justifiable concern that a fragile environment and ecology were under new, unacceptable pressures. Among other improvements in the standard of living since 1974 was an increase in per capita income. By 1991, the average minimum monthly wage was about 40,000 escudos, and per capita income was about $5,000 per annum. By the end of the 20th century, despite continuing poverty at several levels in Portugal, Portugal's economy had made significant progress. In the space of 15 years, Portugal had halved the large gap in living standards between itself and the remainder of the EU. For example, when Portugal joined the EU in 1986, its GDP, in terms of purchasing power-parity, was only 53 percent of the EU average. By 2000, Portugal's GDP had reached 75 percent of the EU average, a considerable achievement. Whether Portugal could narrow this gap even further in a reasonable amount of time remained a sensitive question in Lisbon. Besides structural poverty and the fact that, in 2006, the EU largesse in structural funds (loans and grants) virtually ceased, a major challenge for Portugal's economy will be to reduce the size of the public sector (about 50 percent of GDP is in the central government) to increase productivity, attract outside investment, and diversify the economy. For Portugal's economic planners, the 21st century promises to be challenging.

    See also Empire, Portuguese overseas.

- administrative personnel

- diplomatic personnel

- education of personnel

SUBJECT AREA: Metallurgy

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Brinell graduated as an engineer from Boräs Technical School, and his interest in metallurgy began to develop in 1875 when he became an engineer at the ironworks of Lesjöfors and came under the influence of Gustaf Ekman. In 1882 he was appointed Chief Engineer at the Fagersta Ironworks, where he became one of Sweden's leading experts in the manufacture and heat treatment of tool steels.

His reputation in this field was established in 1885 when he published a paper on the structural changes which occurred in steels when they were heated and cooled, and he was among the first to recognize and define the critical points of steel and their importance in heat treatment. Some of these preliminary findings were first exhibited at Stockholm in 1897. His exhibit at the World Exhibition at Paris in 1900 was far more detailed and there he displayed for the first time his method of hardness determination using a steel-ball indenter. For these contributions he was awarded the French Grand Prix and also the Polhem Prize of the Swedish Technical Society.

He was later concerned with evaluating and developing the iron-ore deposits of north Sweden and was one of the pioneers of the electric blast-furnace. In 1903 he became Chief Engineer of the Jernkontoret and remained there until 1914. In this capacity and as Editor of the Jernkontorets Annaler he made significant contributions to Swedish metallurgy. His pioneer work on abrasion resistance, undertaken long before the term tribology had been invented, gained him the Rinman Medal, awarded by the Jernkontoret in 1920.

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SUBJECT AREA: Electronics and information technology, Horology

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Hetzel trained as an electrical engineer at the Federal Polytechnic in Zurich and worked for several years in the field of telecommunications before joining the Bulova Watch Company in 1950. At that time several companies were developing watches with electromagnetically maintained balances, but they represented very little advance on the mechanical watch and the mechanical switching mechanism was unreliable. In 1952 Hetzel started work on a much more radical design which was influenced by a transistorized tuning-fork oscillator that he had developed when he was working on telecommunications. Tuning forks, whose vibrations were maintained electromagnetically, had been used by scientists during the nineteenth century to measure small intervals of time, but Niaudet- Breguet appears to have been the first to use a tuning fork to control a clock. In 1866 he described a mechanically operated tuning-fork clock manufactured by the firm of Breguet, but it was not successful, possibly because the fork did not compensate for changes in temperature. The tuning fork only became a precision instrument during the 1920s, when elinvar forks were maintained in vibration by thermionic valve circuits. Their primary purpose was to act as frequency standards, but they might have been developed into precision clocks had not the quartz clock made its appearance very shortly afterwards. Hetzel's design was effectively a miniaturized version of these precision devices, with a transistor replacing the thermionic valve. The fork vibrated at a frequency of 360 cycles per second, and the hands were driven mechanically from the end of one of the tines. A prototype was working by 1954, and the watch went into production in 1960. It was sold under the tradename Accutron, with a guaranteed accuracy of one minute per month: this was a considerable improvement on the performance of the mechanical watch. However, the events of the 1920s were to repeat themselves, and by the end of the decade the Accutron was eclipsed by the introduction of quartz-crystal watches.

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SUBJECT AREA: Horology

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Riefler's father was a scientific-instrument maker and clockmaker who in 1841 had founded the firm of Clemens Riefler to make mathematical instruments. After graduating in engineering from the University of Munich Sigmund worked as a surveyor, but when his father died in 1876 he and his brothers ran the family firm. Sigmund was responsible for technical development and in this capacity he designed a new system of drawing-instruments which established the reputation of the firm. He also worked to improve the performance of the precision clock, and in 1889 he was granted a patent for a new form of escapement. This escapement succeeded in reducing the interference of the clock mechanism with the free swinging of the pendulum by impulsing the pendulum through its suspension strip. It proved to be the greatest advance in precision timekeeping since the introduction of the dead-beat escapement about two hundred years earlier. When the firm of Clemens Riefler began to produce clocks with this escapement in 1890, they replaced clocks with Graham's dead-beat escapement as the standard regulator for use in observatories and other applications where the highest precision was required. In 1901 a movement was fitted with electrical rewind and was encapsulated in an airtight case, at low pressure, so that the timekeeping was not affected by changes in barometric pressure. This became the standard practice for precision clocks. Although the accuracy of the Riefler clock was later surpassed by the Shortt free-pendulum clock and the quartz clock, it remained in production until 1965, by which time over six hundred instruments had been made.

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See also: Marrison, Warren Alvin

1) Общая лексика: hum. сокр. Total Luxury Care, внимание и забота (tender loving care), тепло и ласка

2) Медицина: total lung capacity (ИВЛ)

3) Американизм: Tax Lien Certificate

4) Спорт: Tribute Legacy Challenge

5) Военный термин: Technical Liaison Committee, Telecommunication Link Controller, Teleconferencing, Total Logistic Control, Training Leaders Continually, tactical leadership course, tank landing craft, telecommand, tracked load carrier, transporter-launcher container

6) Техника: Table Ladder Chair

7) Шутливое выражение: Talking Listening Cleaning, Theres Lisas Casket, They Love Chino, Tough Luck Charlie, Turtle Loving Care

8) Религия: Teens Living For Christ, Tender Loving Christians, Tender Loving Couples, The Little Churches, The Local Church, The Love Of Christ, Together Loving Christ, Transformation Life Center, Trinity Lutheran Church, Trinity's Loving And Caring, Truth Love And Commitment

9) Юридический термин: Talent Law And Competition, Totally Lost Control, Traffic Light Care

10) Бухгалтерия: Too Little Cash, Too Little Credit

11) Фармакология: thin layer chromatography (тонкослойная хроматография)

12) Автомобильный термин: Toyota Land Cruiser

13) Ветеринария: Three Legged Cat, Tiger Loving Care

14) Грубое выражение: Tiny Little Cock, Titillating Lucrative Channel

15) Телекоммуникации: Transparent Line Control

16) Сокращение: Through Life Costs, Tonnes, Lifting Capacity, Top Line Co. (USA), Thermal Lubrication Charts

17) Текстиль: Tenderly Loved Clothing

18) Университет: Teaching for Literacy Competence, Technology Life And Careers, The Learning Collaborative, Trichotillomania Learning Center

19) Физика: Theoretical Length Of Cut

20) Физиология: Tender Love And Care, Therapeutic Lifestyle Changes, Total Leg Control, Total Lymphocyte Count

21) Сленг: нежная забота

22) Литература: The League City Toastmasters Club, ToastMasters Learning Center

23) Нефть: temporary loss control

24) Онкология: Tumescent Liposuction Contouring

25) Банковское дело: обращающееся налоговое свидетельство (transferable loan certificate)

26) Транспорт: Total Luxury Car, Tune Lubricate And Calibrate

27) Пищевая промышленность: Tasty Little Crackers, Tough Little Center

28) Парфюмерия: тонкослойная хроматография

29) Фирменный знак: Technology Learning Consultants, Terry Leese Computer, The Language Connection, The Leaky Cauldron, The Learning Connection, The Leather Company, The Lee Connection, The Lego Company, The Leroy Company, The Lifestyle Clinic, The Liquor Cabinet, The Longevity Company, The Loyal Cube, The Traci Lords Company, Transitional Language Centre

30) Экология: threshold limit concentration

31) СМИ: The Learning Channel

32) Деловая лексика: Technology Leadership Communities, Think Like A Customer, Tool Location Control, Towels Linens And Cash, Trim Label And Convert, расписка о предоставлении переуступаемого кредита (transferable loan certificate)

33) Бурение: временная изоляция зоны поглощения (temporary loss control)

34) Образование: Tackling Lifes Choices, Teaching Little Children, Teaching, Learning, And Caring, Technology Learning Communities, Technology Linking The Curriculum, Teen Leadership Camp, Teen Leadership Cooperative, Teens Living Clean, That Leadership Camp, Toddler Learning Center, Together Learning And Caring, Total Learning Community, Traditional Learning Calendar, Training Leading And Coaching, Transformational Leadership Circle, Transformational Learning Connections, Trust Loyalty And Challenge

35) Инвестиции: transferable loan certificate

36) Полимеры: thin-layer chromatography

37) Химическое оружие: Transport/Launch Canister

38) Безопасность: Trust Level Control, Twist Lock Control

39) Расширение файла: Compiled Tool Command Language source code (Geoworks Swat)

40) Нефть и газ: tough logging conditions, каротаж на трубах (tough logging conditions)

41) Электротехника: transient load characteristic

42) Фантастика The Legion Clan

43) Общественная организация: Tennessee Llama Community

44) Должность: Technology Life Careers

45) Правительство: Taxi And Limousine Commission, Transportation For Logan County

46) Библиотечное дело: Technology Library Club, Total Library Computerization

1) Общая лексика: hum. сокр. Total Luxury Care, внимание и забота (tender loving care), тепло и ласка

2) Медицина: total lung capacity (ИВЛ)

3) Американизм: Tax Lien Certificate

4) Спорт: Tribute Legacy Challenge

5) Военный термин: Technical Liaison Committee, Telecommunication Link Controller, Teleconferencing, Total Logistic Control, Training Leaders Continually, tactical leadership course, tank landing craft, telecommand, tracked load carrier, transporter-launcher container

6) Техника: Table Ladder Chair

7) Шутливое выражение: Talking Listening Cleaning, Theres Lisas Casket, They Love Chino, Tough Luck Charlie, Turtle Loving Care

8) Религия: Teens Living For Christ, Tender Loving Christians, Tender Loving Couples, The Little Churches, The Local Church, The Love Of Christ, Together Loving Christ, Transformation Life Center, Trinity Lutheran Church, Trinity's Loving And Caring, Truth Love And Commitment

9) Юридический термин: Talent Law And Competition, Totally Lost Control, Traffic Light Care

10) Бухгалтерия: Too Little Cash, Too Little Credit

11) Фармакология: thin layer chromatography (тонкослойная хроматография)

12) Автомобильный термин: Toyota Land Cruiser

13) Ветеринария: Three Legged Cat, Tiger Loving Care

14) Грубое выражение: Tiny Little Cock, Titillating Lucrative Channel

15) Телекоммуникации: Transparent Line Control

16) Сокращение: Through Life Costs, Tonnes, Lifting Capacity, Top Line Co. (USA), Thermal Lubrication Charts

17) Текстиль: Tenderly Loved Clothing

18) Университет: Teaching for Literacy Competence, Technology Life And Careers, The Learning Collaborative, Trichotillomania Learning Center

19) Физика: Theoretical Length Of Cut

20) Физиология: Tender Love And Care, Therapeutic Lifestyle Changes, Total Leg Control, Total Lymphocyte Count

21) Сленг: нежная забота

22) Литература: The League City Toastmasters Club, ToastMasters Learning Center

23) Нефть: temporary loss control

24) Онкология: Tumescent Liposuction Contouring

25) Банковское дело: обращающееся налоговое свидетельство (transferable loan certificate)

26) Транспорт: Total Luxury Car, Tune Lubricate And Calibrate

27) Пищевая промышленность: Tasty Little Crackers, Tough Little Center

28) Парфюмерия: тонкослойная хроматография

29) Фирменный знак: Technology Learning Consultants, Terry Leese Computer, The Language Connection, The Leaky Cauldron, The Learning Connection, The Leather Company, The Lee Connection, The Lego Company, The Leroy Company, The Lifestyle Clinic, The Liquor Cabinet, The Longevity Company, The Loyal Cube, The Traci Lords Company, Transitional Language Centre

30) Экология: threshold limit concentration

31) СМИ: The Learning Channel

32) Деловая лексика: Technology Leadership Communities, Think Like A Customer, Tool Location Control, Towels Linens And Cash, Trim Label And Convert, расписка о предоставлении переуступаемого кредита (transferable loan certificate)

33) Бурение: временная изоляция зоны поглощения (temporary loss control)

34) Образование: Tackling Lifes Choices, Teaching Little Children, Teaching, Learning, And Caring, Technology Learning Communities, Technology Linking The Curriculum, Teen Leadership Camp, Teen Leadership Cooperative, Teens Living Clean, That Leadership Camp, Toddler Learning Center, Together Learning And Caring, Total Learning Community, Traditional Learning Calendar, Training Leading And Coaching, Transformational Leadership Circle, Transformational Learning Connections, Trust Loyalty And Challenge

35) Инвестиции: transferable loan certificate

36) Полимеры: thin-layer chromatography

37) Химическое оружие: Transport/Launch Canister

38) Безопасность: Trust Level Control, Twist Lock Control

39) Расширение файла: Compiled Tool Command Language source code (Geoworks Swat)

40) Нефть и газ: tough logging conditions, каротаж на трубах (tough logging conditions)

41) Электротехника: transient load characteristic

42) Фантастика The Legion Clan

43) Общественная организация: Tennessee Llama Community

44) Должность: Technology Life Careers

45) Правительство: Taxi And Limousine Commission, Transportation For Logan County

46) Библиотечное дело: Technology Library Club, Total Library Computerization

1) развитие; совершенствование; эволюция

2) расширение; рост; подъем

3) обыкн. pl явление; обстоятельство; событие; фактор; тенденция

4) разработка; освоение; производство

5) перемена, изменение

6) подготовка; повышение квалификации

•

- accelerated development

- level of development

- long-run development

- research and development

- retarded development

- stage of development

- steady development

an accounting ratio of the income from an investment to the amount of the investment, used to measure financial performance.

There is a basic formula that will serve most needs, at least initially:

If $1,000 in capital is invested in stock, and one year later the investment yields $1,100, the rate of return of the investment is calculated like this:

Now, assume $1,000 is invested again. One year later, the investment grows to $2,000 in value, but after another year the value of the investment falls to $1,200. The rate of return after the first year is:

The rate of return after the second year is:

     The average annual return for the two years (also known as average annual arithmetic return) can be calculated using this formula:

     Accordingly:

The average annual rate of return is a percentage, but one that is accurate over only a short period, so this method should be used accordingly.

     The geometric or compound rate of return is a better yardstick for measuring investments over the long term, and takes into account the effects of compounding. This formula is more complex and technical.

     The real rate of return is the annual return realized on an investment, adjusted for changes in the price due to inflation. If 10% is earned on an investment but inflation is 2%, then the real rate of return is actually 8%.

Also known as return

SUBJECT AREA: Chemical technology, Weapons and armour

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His family came from Germany and he was the son of a music master. He first became interested in science at the age of 14, when visiting his mineralogist uncle in Hamburg, and studied chemistry at the Royal Polytechnic Institution in London. In 1845 he became one of the twenty-six founding students, under A.W.von Hofmann, of the Royal College of Chemistry. Such was his aptitude for the subject that within two years he became von Hermann's assistant and demonstrator. In 1851 Abel was appointed Lecturer in Chemistry, succeeding Michael Faraday, at the Royal Military Academy, Woolwich, and it was while there that he wrote his Handbook of Chemistry, which was co-authored by his assistant, Charles Bloxam.

Abel's four years at the Royal Military Academy served to foster his interest in explosives, but it was during his thirty-four years, beginning in 1854, as Ordnance Chemist at the Royal Arsenal and at Woolwich that he consolidated and developed his reputation as one of the international leaders in his field. In 1860 he was elected a Fellow of the Royal Society, but it was his studies during the 1870s into the chemical changes that occur during explosions, and which were the subject of numerous papers, that formed the backbone of his work. It was he who established the means of storing gun-cotton without the danger of spontaneous explosion, but he also developed devices (the Abel Open Test and Close Test) for measuring the flashpoint of petroleum. He also became interested in metal alloys, carrying out much useful work on their composition. A further avenue of research occurred in 1881 when he was appointed a member of the Royal Commission set up to investigate safety in mines after the explosion that year in the Sealham Colliery. His resultant study on dangerous dusts did much to further understanding on the use of explosives underground and to improve the safety record of the coal-mining industry. The achievement for which he is most remembered, however, came in 1889, when, in conjunction with Sir James Dewar, he invented cordite. This stable explosive, made of wood fibre, nitric acid and glycerine, had the vital advantage of being a "smokeless powder", which meant that, unlike the traditional ammunition propellant, gunpowder ("black powder"), the firer's position was not given away when the weapon was discharged. Although much of the preliminary work had been done by the Frenchman Paul Vieille, it was Abel who perfected it, with the result that cordite quickly became the British Army's standard explosive.

Abel married, and was widowed, twice. He had no children, but died heaped in both scientific honours and those from a grateful country.

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SUBJECT AREA: Metallurgy

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Soon after graduating from the Ecole des Mines at St-Etienne in 1910, Chevenard joined the Société de Commentry Fourchambault et Decazeville at their steelworks at Imphy, where he remained for the whole of his career. Imphy had for some years specialized in the production of nickel steels. From this venture emerged the first austenitic nickel-chromium steel, containing 6 per cent chromium and 22–4 per cent nickel and produced commercially in 1895. Most of the alloys required by Guillaume in his search for the low-expansion alloy Invar were made at Imphy. At the Imphy Research Laboratory, established in 1911, Chevenard conducted research into the development of specialized nickel-based alloys. His first success followed from an observation that some of the ferro-nickels were free from the low-temperature brittleness exhibited by conventional steels. To satisfy the technical requirements of Georges Claude, the French cryogenic pioneer, Chevenard was then able in 1912 to develop an alloy containing 55–60 per cent nickel, 1–3 per cent manganese and 0.2–0.4 per cent carbon. This was ductile down to −190°C, at which temperature carbon steel was very brittle.

By 1916 Elinvar, a nickel-iron-chromium alloy with an elastic modulus that did not vary appreciably with changes in ambient temperature, had been identified. This found extensive use in horology and instrument manufacture, and even for the production of high-quality tuning forks. Another very popular alloy was Platinite, which had the same coefficient of thermal expansion as platinum and soda glass. It was used in considerable quantities by incandescent-lamp manufacturers for lead-in wires. Other materials developed by Chevenard at this stage to satisfy the requirements of the electrical industry included resistance alloys, base-metal thermocouple combinations, magnetically soft high-permeability alloys, and nickel-aluminium permanent magnet steels of very high coercivity which greatly improved the power and reliability of car magnetos. Thermostatic bimetals of all varieties soon became an important branch of manufacture at Imphy.

During the remainder of his career at Imphy, Chevenard brilliantly elaborated the work on nickel-chromium-tungsten alloys to make stronger pressure vessels for the Haber and other chemical processes. Another famous alloy that he developed, ATV, contained 35 per cent nickel and 11 per cent chromium and was free from the problem of stress-induced cracking in steam that had hitherto inhibited the development of high-power steam turbines. Between 1912 and 1917, Chevenard recognized the harmful effects of traces of carbon on this type of alloy, and in the immediate postwar years he found efficient methods of scavenging the residual carbon by controlled additions of reactive metals. This led to the development of a range of stabilized austenitic stainless steels which were free from the problems of intercrystalline corrosion and weld decay that then caused so much difficulty to the manufacturers of chemical plant.

Chevenard soon concluded that only the nickel-chromium system could provide a satisfactory basis for the subsequent development of high-temperature alloys. The first published reference to the strengthening of such materials by additions of aluminium and/or titanium occurs in his UK patent of 1929. This strengthening approach was adopted in the later wartime development in Britain of the Nimonic series of alloys, all of which depended for their high-temperature strength upon the precipitated compound Ni3Al.

In 1936 he was studying the effect of what is now known as "thermal fatigue", which contributes to the eventual failure of both gas and steam turbines. He then published details of equipment for assessing the susceptibility of nickel-chromium alloys to this type of breakdown by a process of repeated quenching. Around this time he began to make systematic use of the thermo-gravimetrie balance for high-temperature oxidation studies.

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SUBJECT AREA: Horology

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Graham's father died soon after his birth, so he was raised by his brother. In 1688 he was apprenticed to the London clockmaker Henry Aske, and in 1695 he gained his freedom. He was employed as a journeyman by Tompion in 1696 and later married his niece. In 1711 he formed a partnership with Tompion and effectively ran the business in Tompion's declining years; he took over the business after Tompion died in 1713. In addition to his horological interests he also made scientific instruments, specializing in those for astronomical use. As a person, he was well respected and appears to have lived up to the epithet "Honest George Graham". He befriended John Harrison when he first went to London and lent him money to further his researches at a time when they might have conflicted with his own interests.

The two common forms of escapement in use in Graham's time, the anchor escapement for clocks and the verge escapement for watches, shared the same weakness: they interfered severely with the free oscillation of the pendulum and the balance, and thus adversely affected the timekeeping. Tompion's two frictional rest escapements, the dead-beat for clocks and the horizontal for watches, had provided a partial solution by eliminating recoil (the momentary reversal of the motion of the timepiece), but they had not been successful in practice. Around 1720 Graham produced his own much improved version of the dead-beat escapement which became a standard feature of regulator clocks, at least in Britain, until its supremacy was challenged at the end of the nineteenth century by the superior accuracy of the Riefler clock. Another feature of the regulator clock owed to Graham was the mercury compensation pendulum, which he invented in 1722 and published four years later. The bob of this pendulum contained mercury, the surface of which rose or fell with changes in temperature, compensating for the concomitant variation in the length of the pendulum rod. Graham devised his mercury pendulum after he had failed to achieve compensation by means of the difference in expansion between various metals. He then turned his attention to improving Tompion's horizontal escapement, and by 1725 the cylinder escapement existed in what was virtually its final form. From the following year he fitted this escapement to all his watches, and it was also used extensively by London makers for their precision watches. It proved to be somewhat lacking in durability, but this problem was overcome later in the century by using a ruby cylinder, notably by Abraham Louis Breguet. It was revived, in a cheaper form, by the Swiss and the French in the nineteenth century and was produced in vast quantities.

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See also: Barlow, Edward; Guillaume, Charles-Edouard

SUBJECT AREA: Horology

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Born Edmund Beckett Denison, he was educated at Eton and Trinity College, Cambridge, where he studied mathematics, graduating in 1838. He was called to the Bar in 1841 and became a Queen's Counsel in 1854. He built up a large and lucrative practice which gave him the independence to pursue his many interests outside law. His interest in horology may have been stimulated by a friend and fellow lawyer, J.M. Bloxham, who interestingly had invented a gravity escapement with an affinity to the escapement eventually used by Denison. Denison studied horology with his usual thoroughness and by 1850 he had published his Rudimentary Treatise on Clock and Watchmaking. It was natural, therefore, that he should have been invited to be a referee when a disagreement arose over the design of the clock for the new Houses of Parliament. Typically, he interpreted his brief very liberally and designed the clock himself. The most distinctive feature of the clock, in its final form, was the incorporation of a gravity escapement. A gravity escapement was particularly desirable in a public clock as it enabled the pendulum to receive a constant impulse (and thus swing with a constant amplitude), despite the variable forces that might be exerted by the wind on the exposed hands. The excellent performance of the prestigious clock at Westminster made Denison's form of gravity escapement de rigueur for large mechanical public clocks produced in Britain and in many other countries. In 1874 he inherited his father's baronetcy, dropping the Denison name, but later adopted the name Grimthorpe when he was created a Baron in 1886.

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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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