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SUBJECT AREA: Agricultural and food technology, Domestic appliances and interiors

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To assist the finances of a coal miner's family, Owens entered a glassworks at Wheeling, Virginia, at the tender age of 10, stoking coal into the "glory hole" or furnace where glass was resoftened at various stages of the hand-forming process. By the age of 15 he had become a glassblower.

In 1888 Owens moved to the glassworks of Edward Drummond Libbey at Toledo, Ohio, where within three months he was appointed Superintendent and, not long after, a branch manager. In 1893 Owens supervised the company's famous exhibit at the World's Columbian Exposition at Chicago. He had by then begun experiments that were to lead to the first automatic bottle-blowing machine. He first used a piston pump to suck molten glass into a mould, and then transferred the gathered glass over another mould into which the bottle was blown by reversing the pump. The first patents were taken out in 1895, followed by others incorporating improvements and culminating in the patent of 8 November 1904 for an essentially perfected machine. Eventually it was capable of producing four bottles a second, thus effecting a revolution in bottle making. Owens, with Libbey and others, set up the Owens Bottle Machine Company in 1903, which Owens himself managed from 1915 to 1919, becoming Vice-President from 1915 until his death. A plant was also established in Manchester in 1905.

Besides this, Owens and Libbey first assisted Irving W.Colburn with his experiments on the continuous drawing of flat sheet glass and then in 1912 bought the patents, forming the Owens-Libbey Sheet Glass Company. In all, Owens was granted forty-five US patents, mainly relating to the manufacture and processing of glass. Owens's undoubted inventive genius was hampered by a lack of scientific knowledge, which he made good by judicious consultation.

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SUBJECT AREA: Metallurgy

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His family emigrated to Australia when he was 5 years old. He was educated at Wesley College, Melbourne, and attended Queen's College, University of Melbourne, graduating in physics and engineering in 1897. As an 1851 Exhibitioner he then spent three years at St John's College, Cambridge, under Sir Alfred Ewing, where he studied the microstructure of deformed metal crystals and abandoned his original intention of becoming a civil engineer. Rosenhain was the first to observe the slip-bands in metal crystals, and in the Bakerian Lecture delivered jointly by Ewing and Rosenhain to the Royal Society in 1899 it was shown that metals deformed plastically by a mechanism involving shear slip along individual crystal planes. From this conception modern ideas on the plasticity and recrystallization of metals rapidly developed. On leaving Cambridge, Rosenhain joined the Birmingham firm of Chance Brothers, where he worked for six years on optical glass and lighthouse-lens systems. A book, Glass Manufacture, written in 1908, derives from this period, during which he continued his metallurgical researches in the evenings in his home laboratory and published several papers on his work.

In 1906 Rosenhain was appointed Head of the Metallurgical Department of the National Physical Laboratory (NPL), and in 1908 he became the first Superintendent of the new Department of Metallurgy and Metallurgical Chemistry. Many of the techniques he introduced at Teddington were described in his Introduction to Physical Metallurgy, published in 1914. At the outbreak of the First World War, Rosenhain was asked to undertake work in his department on the manufacture of optical glass. This soon made it possible to manufacture optical glass of high quality on an industrial scale in Britain. Much valuable work on refractory materials stemmed from this venture. Rosenhain's early years at the NPL were, however, inseparably linked with his work on light alloys, which between 1912 and the end of the war involved virtually all of the metallurgical staff of the laboratory. The most important end product was the well-known "Y" Alloy (4% copper, 2% nickel and 1.5% magnesium) extensively used for the pistons and cylinder heads of aircraft engines. It was the prototype of the RR series of alloys jointly developed by Rolls Royce and High Duty Alloys. An improved zinc-based die-casting alloy devised by Rosenhain was also used during the war on a large scale for the production of shell fuses.

After the First World War, much attention was devoted to beryllium, which because of its strength, lightness, and stiffness would, it was hoped, become the airframe material of the future. It remained, however, too brittle for practical use. Other investigations dealt with impurities in copper, gases in aluminium alloys, dental alloys, and the constitution of alloys. During this period, Rosenhain's laboratory became internationally known as a centre of excellence for the determination of accurate equilibrium diagrams.

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SUBJECT AREA: Chemical technology

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Pilkington was educated at Sherborne School and Trinity College, Cambridge, where he graduated in mechanical science. He spent one year at Cambridge followed by war service, which lasted until 1945. He returned to complete his degree and then joined Pilkington, the well-known glass manufacturer at St Helens' Lancashire, in 1947. Sir Alastair is not, however, related to the Pilkington family of glassmakers.

The forming of perfectly flat glass that retained its fire finish had eluded glassmakers for centuries. Until the 1950s the only way of making really flat glass was to form plate glass by continuous casting between steel rollers. This destroyed the fire finish, which had to be restored by expensive grinding and polishing. The process entailed the loss of 20 per cent of good glass. The idea of floating glass on molten metal occurred to Sir Alastair in October 1952, and thereafter he remained in charge of development until commercial success had been achieved. The idea of floating molten glass on molten tin had been patented in the United States as early as 1902, but had never been pursued. The Pilkington process in essence was to float a ribbon of molten glass on a bath of molten tin in an inert atmosphere of nitrogen, to prevent oxidation of the tin. It was patented in Britain in 1957 and in the USA two years later. The first production glass issued from the plant in May 1957, although the first good glass did not appear until July 1958. The process was publicly announced the following year and was quickly taken up by the industry. It is now the universal method for manufacturing high quality flat glass.

Having seen through the greatest single advance in glassmaking and one of the most important technological developments this century, Sir Alastair became Chairman of Pilkingtons until 1980 and President thereafter.

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SUBJECT AREA: Photography, film and optics

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A cousin of the photographic pioneer J.N. Niepce, he attended the military school of Saumur, graduating in 1827. Niepce de St Victor had wide scientific interests, but came to photography indirectly from experiments he made on fading dyes in military uniforms. He was transferred to the Paris Municipal Guard in 1845 and was able to set up a chemical laboratory to conduct research. From photographic experiments performed in his spare time, Niepce de St Victor devised the first practicable photographic process on glass in 1847. Using albumen derived from the white of eggs as a carrier for silver iodide, he prepared finely detailed negatives which produced positive prints far sharper than those made with the paper negatives of Talbot's calotype process. Exposure times were rather long, however, and the albumen-negative process was soon displaced by the wet-collodion process introduced in 1851, although albumen positives on glass continued to be used for high-quality stereoscopic views and lantern slides. In 1851 Niepce de St Victor described a photographic colour process, and between 1853 and 1855 he developed his famous cousin's bitumen process into a practicable means of producing photographically derived printing plates. He then went on to investigate the use of uranium salts in photography. He presented twenty-six papers to the Académie des Sciences between 1847 and 1862.

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SUBJECT AREA: Metallurgy, Paper and printing

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The little that is known of Theophilus is what can be inferred from his great work, De diversis artibus. He was a Benedictine monk and priest living in north-west Germany, probably near an important art centre. He was an educated man, conversant with scholastic philosophy and at the same time a skilled, practising craftsman. Even his identity is obscure: Theophilus is a pseudonym, possibly for Roger of Helmarshausen, for the little that is known of both is in agreement.

Evidence in De diversis suggests that it was probably composed during 1110 to 1140. White (see Further Reading) goes on to suggest late 1122 or early 1123, on the grounds that Theophilus only learned of St Bernard of Clairvaulx's diatribe against lavish church ornamentation during the writing of the work, for it is only in the preface to Book 3 that Theophilus seeks to justify his craft. St Bernard's Apologia can be dated late 1122. No other medieval work on art combines the comprehensive range, orderly presentation and attention to detail as does De diversis. It has been described as an encyclopedia of medieval skills and crafts. It also offers the best and often the only description of medieval technology, including the first direct reference to papermaking in the West, the earliest medieval account of bell-founding and the most complete account of organ building. Many metallurgical techniques are described in detail, such as the making of a crucible furnace and bloomery hearth.

The treatise is divided into three books, the first on the materials and art of painting, the second on glassmaking, including stained glass, glass vessels and the blown-cylinder method for flat glass, and the final and longest book on metalwork, including working in iron, copper, gold and silver for church use, such as chalices and censers. The main texts are no mere compilations, but reveal the firsthand knowledge that can only be gained by a skilled craftsman. The prefaces to each book present perhaps the only medieval expression of an artist's ideals and how he sees his art in relation to the general scheme of things. For Theophilus, his art is a gift from God and every skill an act of praise and piety. Theophilus is thus an indispensable source for medieval crafts and technology, but there are indications that the work was also well known at the time of its composition and afterwards.

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SUBJECT AREA: Agricultural and food technology

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As the son of an inn keeper, Nicolas Appert would have learned about pickling and brewing, but he chose to become a chef and confectioner, establishing himself in the rue des Lombards in Paris in 1780. He prospered there until about 1795, and in that year he began experimenting in ways to preserve foodstuffs, succeeding with soups, vegetables, juices, dairy products, jellies, jams and syrups. His method was to place food in glass jars, seal the jars with cork and sealing wax, then sterilize them by immersion in boiling water for a predetermined time.

In 1810 the French Government offered a 12,000 franc award to anyone succeeding in preserving high-quality foodstuffs for its army and navy. Appert won the award and in 1812 used the money to open the world's first food-bottling factory, La Maison Appert, in the town of Massey, near Paris. He established agents in all the major sea ports, recognizing the marine market as his most likely customer, and supplied products to Napoleon's troops in the field. By 1820 Appert's method was in use all over the United States, in spite of the simultaneous development of other containers of tin or other metals by an English merchant, Peter Durand, and the production of canned food products by the Bermondsey firm of Donkin \& Hall, London. The latter had opened the first canning factory in England in 1811.

Initially Appert used glass jars and bottles, but in 1822 he changed to tin-plated metal cans. To heat the cans he used an autoclave, which heated the water to a temperature higher than its boiling point. A hammer and chisel were needed to open cans until the invention of a can opener by an Englishman named Yates in 1855. Despite Appert's successes, he received little financial reward and died in poverty; he was buried in a common grave.

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SUBJECT AREA: Domestic appliances and interiors, Mechanical, pneumatic and hydraulic engineering

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Ashley, manager of an iron foundry at Ferrybridge, Yorkshire, began trying to construct a bottle-making machine in the 1880s. In 1886 he obtained a patent for a two-stage machine. This proved to be impracticable, but improvements were described in further patents in 1887 and 1889, leading to a three-stage process, embodying the basic elements of a machine to make narrow-necked glass bottles. The Ashley (Machine-Made) Bottle Company was set up to exploit the invention, but had failed by 1894 due to poor management, although it had claimed to make bottles in a tenth of the time taken to make them by hand. Ashley had shown the way, however, and his machines were still producing good bottles in 1918. The process was a stage along the way to complete mechanization brought about by M.J. Owens's machine.

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SUBJECT AREA: Medical technology, Photography, film and optics

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Dallos graduated from the University of Budapest in 1929 and almost at once specialized in contact-lens work and was appointed Assistant Professor. At that time the fitting of lenses was and had been, since their inception c.1885, a matter of trial and error. He developed a method of taking a moulding of the surface of the eye and then producing a blown-glass lens to this shape. His work was based on a concept of corneal physiology and the need to maintain its normal respiration and metabolism.

In 1937 he was invited to England to set up a centre in London making these innovations available. During the Second World War he worked in collaboration with the services and their special needs, and at its conclusion was invited to work at Moorfields Eye Hospital and later at the Western Opthalmic Hospital. Although plastic materials have now superseded Dallos's technology, the fundamental basis of his work remains relevant.

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SUBJECT AREA: Architecture and building

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A year after he began practice as an architect, Gropius was responsible for the pace-setting Fagus shoe-last factory at Alfeld-an-der-Leine in Germany, one of the few of his buildings to survive the Second World War. Today the building does not appear unusual, but in 1911 it was a revolutionary prototype, heralding the glass curtain walled method of non-load-bearing cladding that later became ubiquitous. Made from glass, steel and reinforced concrete, this factory initiated a new concept, that of the International school of modern architecture.

In 1919 Gropius was appointed to head the new School of Art and Design at Weimar, the Staatliches Bauhaus. The school had been formed by an amalgamation of the Grand Ducal schools of fine and applied arts founded in 1906. Here Gropius put into practice his strongly held views and he was so successful that this small college, which trained only a few hundred students in the limited years of its existence, became world famous, attracting artists, architects and students of quality from all over Europe.

Gropius's idea was to set up an institution where students of all the arts and crafts could work together and learn from one another. He abhorred the artificial barriers that had come to exist between artists and craftsmen and saw them all as interdependent. He felt that manual dexterity was as essential as creative design. Every Bauhaus student, whatever the individual's field of work or talent, took the same original workshop training. When qualified they were able to understand and supervise all the aesthetic and constructional processes that made up the scope of their work.

In 1924, because of political changes, the Weimar Bauhaus was closed, but Gropius was invited to go to Dessau to re-establish it in a new purpose-built school which he designed. This group of buildings became a prototype that designers of the new architectural form emulated. Gropius left the Bauhaus in 1928, only a few years before it was finally closed due to the growth of National Socialism. He moved to England in 1934, but because of a lack of architectural opportunities and encouragement he continued on his way to the USA, where he headed the Department of Architecture at Harvard University's Graduate School of Design from 1937 to 1952. After his retirement from there Gropius formed the Architect's Collaborative and, working with other architects such as Marcel Breuer and Pietro Belluschi, designed a number of buildings (for example, the US Embassy in Athens (1960) and the Pan Am Building in New York (1963)).

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SUBJECT AREA: Photography, film and optics

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Torricelli was the eldest child of a textile artisan. Between 1625 and 1626 he attended the Jesuit school at Faenza, where he showed such outstanding aptitude in mathematics and philosophy that his uncle was persuaded to send him to Rome to a school run by Benedetto Castelli, a mathematician and engineer and a former pupil of Galileo Galilei. Between 1630 and 1641, Torricelli was possibly Secretary to Giovanni Ciampoli, Galileo's friend and protector. In 1641 Torricelli wrote a treatise, De motugravium, amplifying Galileo's doctrine on the motion of projectiles, and Galileo accepted him as a pupil. On Galileo's death in 1642, he was appointed as mathematician and philosopher to the court of Grand Duke Ferdinando II of Tuscany. He remained in Florence until his early death in 1647, possibly from typhoid fever. He wrote a great number of mathematical papers on conic sections, the cycloid, the logarithmic curve and other subjects, which made him well known.

By 1642 Torricelli was producing good lenses for telescopes; he subsequently improved them, and attained near optical perfection. He also constructed a simple microscope with a small glass sphere as a lens. Galileo had looked at problems of raising water with suction pumps, and also with a siphon in 1630. Torricelli brought up the subject again in 1640 and later produced his most important invention, the barometer. He used mercury to fill a glass tube that was sealed at one end and inverted it. He found that the height of mercury in the tube adjusted itself to a well-defined level of about 76 cm (30 in.), higher than the free surface outside. He realized that this must be due to the pressure of the air on the outside surface and predicted that it would fall with increasing altitude. He thus demonstrated the pressure of the atmosphere and the existence of a vacuum on top of the mercury, publishing his findings in 1644. He later noticed that changes in the height of the mercury were related to changes in the weather.

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SUBJECT AREA: Photography, film and optics

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Apprenticed to a silversmith in London, Archer's interest in coin design and sculpture led to his taking up photography in 1847. Archer began experiments to improve Talbot's calotype process and by 1848 he was investigating the properties of a newly discovered material, collodion, a solution of gun-cotton in ether. In 1851 Archer published details of a process using collodion on glass plates as a carrier for silver salts. The process combined the virtues of both the calotype and the daguerreotype processes, then widely practised, and soon displaced them from favour. Collodion plates were only sensitive when moist and it was therefore essential to use them immediately after they had been prepared. Popularly known as "wet plate" photography, it became the dominant photographic process for thirty years.

Archer introduced other minor photographic innovations and in 1855 patented a collodion stripping film. He had not patented the wet-plate process, however, and made no financial gain from his photographic work. He died in poverty in 1857, a matter of some embarrassment to his contemporaries. A subscription fund was raised, to which the Government was subsequently persuaded to add an annual pension.

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SUBJECT AREA: Recording

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After arriving in the USA in 1870 and becoming an American citizen, Berliner worked as a dry-goods clerk in Washington, DC, and for a period studied electricity at Cooper Union for the Advancement of Science and Art, New York. He invented an improved microphone and set up his own experimental laboratory in Washington, DC. He developed a microphone for telephone use and sold the rights to the Bell Telephone Company. Subsequently he was put in charge of their laboratory, remaining in that position for eight years. In 1881 Berliner, with his brothers Joseph and Jacob, founded the J.Berliner Telephonfabrik in Hanover, the first factory in Europe specializing in telephone equipment.

Inspired by the development work performed by T.A. Edison and in the Volta Laboratory (see C.S. Tainter), he analysed the existing processes for recording and reproducing sound and in 1887 developed a process for transferring lateral undulations scratched in soot into an etched groove that would make a needle and diaphragm vibrate. Using what may be regarded as a combination of the Phonautograph of Léon Scott de Martinville and the photo-engraving suggested by Charles Cros, in May 1887 he thus demonstrated the practicability of the laterally recorded groove. He termed the apparatus "Gramophone". In November 1887 he applied the principle to a glass disc and obtained an inwardly spiralling, modulated groove in copper and zinc. In March 1888 he took the radical step of scratching the lateral vibrations directly onto a rotating zinc disc, the surface of which was protected, and the subsequent etching created the groove. Using well-known principles of printing-plate manufacture, he developed processes for duplication by making a negative mould from which positive copies could be pressed in a thermoplastic compound. Toy gramophones were manufactured in Germany from 1889 and from 1892–3 Berliner manufactured both records and gramophones in the USA. The gramophones were hand-cranked at first, but from 1896 were based on a new design by E.R. Johnson. In 1897–8 Berliner spread his activities to England and Germany, setting up a European pressing plant in the telephone factory in Hanover, and in 1899 a Canadian company was formed. Various court cases over patents removed Berliner from direct running of the reconstructed companies, but he retained a major economic interest in E.R. Johnson's Victor Talking Machine Company. In later years Berliner became interested in aeronautics, in particular the autogiro principle. Applied acoustics was a continued interest, and a tile for controlling the acoustics of large halls was successfully developed in the 1920s.

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SUBJECT AREA: Photography, film and optics

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After beginning his working life in a tobacco company, Blanquart-Evrard became Laboratory Assistant to a chemist. He also became interested in painting on ivory and porcelain, foreshadowing a life-long interest in science and art. Following his marriage to the daughter of a textile merchant, Blanquart-Evrard became a partner in the family business in Lyon. During the 1840s he became interested in Talbot's calotype process and found that by applying gallic acid alone, as a developing agent after exposure, the exposure time could be shorter and the resulting image clearer. Blanquart-Evrard recognized that his process was well suited to producing positive prints in large numbers. During 1851 and 1852, in association with an artist friend, he became involved in producing quantities of prints for book illustrations. In 1849 he had announced a glass negative process similar to that devised two years earlier by Niepcc de St Victor. The carrying agent for silver salts was albumen, and more far-reaching was his albumen-coated printing-out paper announced in 1850. Albumen printing paper was widely adopted and the vast majority of photographs made in the nineteenth century were printed in this form. In 1870 Blanquart-Evrard began an association with the pioneer colour photographer Ducos du Hauron with a view to opening a three-colour printing establishment. Unfortunately plans were delayed by the Franco-Prussian War, and Blanquart-Evrard died in 1872 before the project could be brought to fruition.

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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: Medical technology

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The younger son of a landed Midlands family, Floyer embarked on medical studies at Oxford at the age of 15 and graduated in 1674. He returned to Lichfield where he resided and practised, as well as being acquainted with the family of Samuel Johnson, for the remainder of a long life. Described by a later biographer as "fantastic, whimsical, pretentious, research-minded and nebulous", he none the less, as his various medical writings testify, became a pioneer in several fields of medical endeavour. It seems likely that he was well aware of the teachings of Sanctorius in relation to measurement in medicine and he probably had a copy of Sanctorius's weighing-machine made and put to use in Lichfield.

He also embarked on extensive studies relating to pulse, respiration rate, temperature, barometric readings and even latitude. Initially he used the minute hand of a pendulum clock or a navigational minute glass. He then commissioned from Samuel Watson, a London watch-and clockmaker, a physicians' pulse watch incorporating a second-hand and a stop mechanism. In 1707 and 1710 he published a massive work, dedicated to Queen Anne, that emphasized the value of the accurate measurement of pulse rates in health and disease.

His other interests included studies of blood pressure, asthma, and the medical value of cold bathing. It is of interest that it was at his suggestion that the young Samuel Johnson was taken to London to receive the Royal Touch, from Queen Anne, for scrofula.

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SUBJECT AREA: Medical technology, Photography, film and optics

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Described as a versatile genius, although less fairly also as an amateur dabbler, Franklin was of immediate English ancestry from Northamptonshire. During a long and prolific life, his innovations included the Franklin stove, arrangements for house ventilation and aeronautical and electrical experimentation. He was awarded the Copley Medal of the Royal Society in 1753 for his discoveries in relation to lighting conductors.

His principal contribution to medicine was the invention of bifocal lenses constructed by the cementing of glass wafers to existing spectacle lenses. The date of this invention is uncertain, but was probably c.1774. A letter he wrote to a friend in 1775 refers to Peter Dollond, of the London optical firm, who has sometimes been thought to have contemporaneously developed some form of bifocal lens. Franklin's invention of the lens was prompted by his own visual difficulties.

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SUBJECT AREA: Architecture and building

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Garnier spent almost all his life in Lyon, apart from the years that he passed in Rome as a result of winning the Prix de Rome in 1889. While there, he evolved his concept of the cité industrielle, plans of which he exhibited and published early in the twentieth century. This was an idealized town, powered electrically, with its industrial areas separated from leisure ones. Garnier envisaged flat-roofed buildings supported on pilotis, with glass cladding, a steel structure, and extensive use of concrete. He proposed that each family should occupy its own house in a garden-city concept. In 1905 Garnier became city architect to Lyon, where he was able to carry out some of his ideas of the cité industrielle. He used concrete widely in such schemes as the municipal stadium, the Abattoirs de la Mouche and various housing schemes.

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SUBJECT AREA: Electricity, Electronics and information technology, Public utilities

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After attending Owens College, Manchester, Hopkinson was admitted to Trinity College, Cambridge, in 1867 to read for the Mathematical Tripos. An appointment in 1872 with the lighthouse department of the Chance Optical Works in Birmingham directed his attention to electrical engineering. His most noteworthy contribution to lighthouse engineering was an optical system to produce flashing lights that distinguished between individual beacons. His extensive researches on the dielectric properties of glass were recognized when he was elected to a Fellowship of the Royal Society at the age of 29. Moving to London in 1877 he became established as a consulting engineer at a time when electricity supply was about to begin on a commercial scale. During the remainder of his life, Hopkinson's researches resulted in fundamental contributions to electrical engineering practice, dynamo design and alternating current machine theory. In making a critical study of the Edison dynamo he developed the principle of the magnetic circuit, a concept also arrived at by Gisbert Kapp around the same time. Hopkinson's improvement of the Edison dynamo by reducing the length of the field magnets almost doubled its output. In 1890, in addition to-his consulting practice, Hopkinson accepted a post as the first Professor of Electrical Engineering and Head of the Siemens laboratory recently established at King's College, London. Although he was not involved in lecturing, the position gave him the necessary facilities and staff and student assistance to continue his researches. Hopkinson was consulted on many proposals for electric traction and electricity supply, including schemes in London, Manchester, Liverpool and Leeds. He also advised Mather and Platt when they were acting as contractors for the locomotives and generating plant for the City and South London tube railway. As early as 1882 he considered that an ideal method of charging for the supply of electricity should be based on a two-part tariff, with a charge related to maximum demand together with a charge for energy supplied. Hopkinson was one the foremost expert witnesses of his day in patent actions and was himself the patentee of over forty inventions, of which the three-wire system of distribution and the series-parallel connection of traction motors were his most successful. Jointly with his brother Edward, John Hopkinson communicated the outcome of his investigations to the Royal Society in a paper entitled "Dynamo Electric Machinery" in 1886. In this he also described the later widely used "back to back" test for determining the characteristics of two identical machines. His interest in electrical machines led him to more fundamental research on magnetic materials, including the phenomenon of recalescence and the disappearance of magnetism at a well-defined temperature. For his work on the magnetic properties of iron, in 1890 he was awarded the Royal Society Royal Medal. He was a member of the Alpine Club and a pioneer of rock climbing in Britain; he died, together with three of his children, in a climbing accident.

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SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics

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During the early years of the motion picture industry, Jenkins made many innovations, including the development in 1894 of his own projector, the "Phantoscope", which was widely used for a number of years. In the same year he also suggested the possibility of electrically transmitting pictures over a distance, an interest that led to a lifetime of experimentation. As a result of his engineering contributions to the practical realization of moving pictures, in 1915 the National Motion Picture Board of Trade asked him to chair a committee charged with establishing technical standards for the industry. This in turn led to his proposing the creation of a professional society for those engineers in the industry, and the following year the Society of Motion Picture Engineers (later to become the Society of Motion Picture and Television Engineers) was formed, with Jenkins as its first President. Soon after this he began experiments with mechanical television, using both the Nipkow hole-spiral disc and a low-definition system of his own, based on rotating bevelled glass discs (his so-called "prismatic rings") and alkali-metal photocells. In the 1920s he gave many demonstrations of mechanical television, including a cable transmission of a crude silhouette of President Harding from Washington, DC, to Philadelphia in 1923 and a radio broadcast from Washington in 1928. The following year he formed the Jenkins Television Company to make television transmitters and receivers, but it soon went into debt and was acquired by the de Forest Company, from whom RCA later purchased the patents.

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See also: Baird, John Logie; Ives, Herbert Eugene; Zworykin, Vladimir Kosma