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1 Developing Dyes
Colour substances which, although they have some affinity for textiles, are not brought out in full hue until a developing process has been applied. Ice water is one of the commonest developing agents used. (This group of dyes is not very important) -
2 Developing Agents
Various chemicals which are used with certain dyestuffs known as developing dyes in order to bring out in full, the colour on the material. Ice water is a common agent. -
3 Dyes
The following list gives a general classification of colouring matters for dyeing textile fibres: - Acid Colours dye animal fibres only and have no affinity for cellulose. If union goods are dyed with acid dyes the cotton remains white and the wool is dyed. They dye wool and silk from baths containing Glauber's salt and some acid, hence their name. Acid colours consist principally of the Azo compounds and are fairly cheap, so are used for the dyeing of dress materials, suitings, etc. No preparation of the fabric is necessary prior to dyeing. Wool and silk fabrics ate simply steeped in a warm acidified solution. Azo Dyes - These are colouring matters used for cotton dyeing and are developed direct on to the fibre. Basic Dyes - Cotton has no direct affinity for basic dyes, which consist of colour bases in combination with other chemicals, as tannic acid, sumach, or other tanning substances. Tannic acid is taken up by cotton which will then absorb the basic colours. They are very bright but not very fast. They dye wool and silk direct from plain baths. Developing Colours - See Developing Colours. Direct Cotton Colours - Dye cotton, linen, wool or silk directly, will dye cotton direct but by the addition of various salts deeper shades are obtained. With the addition of a little acid will dye wool and silk. See direct Dyes. Mordant Colours - As a rule these are very fast to washing and mostly fast to; light, such as logwood, black, Turkey red, etc. The mordant forms insoluble compounds with the colours, which are then applied to the fibres so that the insoluble coloured compounds are formed within the fibres The cotton is prepared first with some metallic mordant, as chrome, iron or alumina. Substantive Dyes - Have the property of dyeing fibres direct. They are Direct Dyes, that is they have an affinity for fibres. Sulphur and vat dyes are substantive towards cotton. Sulphur Colours are used for vegetable fibres only. These colours are insoluble in water and require the addition of sodium sulphide which converts them into soluble substances which will dye cotton. Usually fast to washing and alkalis - not so fast to bleaching (see Sulphur Colours). Vat Colours - These are fast dyes for cotton. They are insoluble in water so are converted into a soluble compound by some chemical reducing agent, and then they have a direct affinity for cotton which is dyed when immersed in the solution. There are two main classes, those prepared from anthraquinone and those related to indigo. They will dye viscose and cuprammonium rayons (see Vat Dyes) -
4 Diazotizing
A dyeing process for producing fast colours from semi-fast or fugitive dyes by treating the fabric after the dyeing in a solution of sodium nitrate and sulphuric acid, and then with some developer, such as ammonia, carbolic acid, napthylamines and other organic compounds (see Developing agents and Developing dyes) -
5 Caro, Heinrich
[br]b. 13 February 1834 Poznan, Polandd. 11 October 1911 Dresden, Germany[br]German dyestuffi chemist.[br]Caro received vocational training as a dyer at the Gewerbeinstitut in Berlin from 1852, at the same time attending chemistry lectures at the university there. In 1855 he was hired as a colourist by a firm of calico printers in Mulheim an der Ruhr, where he was able to demonstrate the value of scientific training in solving practical problems. Two years later, the year after Perkin's discovery of aniline dyes, he was sent to England in order to learn the latest dyeing techniques. He took up a post an analytical chemist with the chemical firm Roberts, Dale \& Co. in Manchester; after finding a better way of synthesizing Perkin's mauve, he became a partner in the business. Caro was able to enlarge both his engineering experience and his chemical knowledge there, particularly by studying Hofmann's researches on the aniline dyes. He made several discoveries, including induline, Bismark brown and Martius yellow.Like other German chemists, however, he found greater opportunities opening up in Germany, and in 1866 he returned to take up a post in Bunsen's laboratory in Heidelberg. In 1868 Caro obtained the important directorship of Badische Anilin-Soda- Fabrik (BASF), the first true industrial research organization and leading centre of dyestuffs research. A steady stream of commercial successes followed. In 1869, after Graebe and Liebermann had showed him their laboratory synthesis of the red dye alizarin, Caro went on to develop a cheaper and commercially viable method. During the 1870s he collaborated with Adolf von Baeyer to make methylene blue and related dyes, and then went on to the azo dyes. His work on indigo was important, but was not crowned with commercial success; that came in 1897 when his successor at BASF discovered a suitable process for producing indigo on a commercial scale. Caro had resigned his post in 1889, by which time he had made notable contributions to German supremacy in the fast-developing dyestuffs industry.[br]Further ReadingA.Bernthsen, 1912, obituary, Berichte derDeutschen Chemischen Gesellschaft, 45; 1,987–2,042 (a substantial obituary).LRD -
6 Empire, Portuguese overseas
(1415-1975)Portugal was the first Western European state to establish an early modern overseas empire beyond the Mediterranean and perhaps the last colonial power to decolonize. A vast subject of complexity that is full of myth as well as debatable theories, the history of the Portuguese overseas empire involves the story of more than one empire, the question of imperial motives, the nature of Portuguese rule, and the results and consequences of empire, including the impact on subject peoples as well as on the mother country and its society, Here, only the briefest account of a few such issues can be attempted.There were various empires or phases of empire after the capture of the Moroccan city of Ceuta in 1415. There were at least three Portuguese empires in history: the First empire (1415-1580), the Second empire (1580-1640 and 1640-1822), and the Third empire (1822-1975).With regard to the second empire, the so-called Phillipine period (1580-1640), when Portugal's empire was under Spanish domination, could almost be counted as a separate era. During that period, Portugal lost important parts of its Asian holdings to England and also sections of its colonies of Brazil, Angola, and West Africa to Holland's conquests. These various empires could be characterized by the geography of where Lisbon invested its greatest efforts and resources to develop territories and ward off enemies.The first empire (1415-1580) had two phases. First came the African coastal phase (1415-97), when the Portuguese sought a foothold in various Moroccan cities but then explored the African coast from Morocco to past the Cape of Good Hope in South Africa. While colonization and sugar farming were pursued in the Atlantic islands, as well as in the islands in the Gulf of Guinea like São Tomé and Príncipe, for the most part the Portuguese strategy was to avoid commitments to defending or peopling lands on the African continent. Rather, Lisbon sought a seaborne trade empire, in which the Portuguese could profit from exploiting trade and resources (such as gold) along the coasts and continue exploring southward to seek a sea route to Portuguese India. The second phase of the first empire (1498-1580) began with the discovery of the sea route to Asia, thanks to Vasco da Gama's first voyage in 1497-99, and the capture of strong points, ports, and trading posts in order to enforce a trade monopoly between Asia and Europe. This Asian phase produced the greatest revenues of empire Portugal had garnered, yet ended when Spain conquered Portugal and commanded her empire as of 1580.Portugal's second overseas empire began with Spanish domination and ran to 1822, when Brazil won her independence from Portugal. This phase was characterized largely by Brazilian dominance of imperial commitment, wealth in minerals and other raw materials from Brazil, and the loss of a significant portion of her African and Asian coastal empire to Holland and Great Britain. A sketch of Portugal's imperial losses either to native rebellions or to imperial rivals like Britain and Holland follows:• Morocco (North Africa) (sample only)Arzila—Taken in 1471; evacuated in 1550s; lost to Spain in 1580, which returned city to a sultan.Ceuta—Taken in 1415; lost to Spain in 1640 (loss confirmed in 1668 treaty with Spain).• Tangiers—Taken in 15th century; handed over to England in 1661 as part of Catherine of Braganza's dowry to King Charles II.• West Africa• Fort/Castle of São Jorge da Mina, Gold Coast (in what is now Ghana)—Taken in 1480s; lost to Holland in 1630s.• Middle EastSocotra-isle—Conquered in 1507; fort abandoned in 1511; used as water resupply stop for India fleet.Muscat—Conquered in 1501; lost to Persians in 1650.Ormuz—Taken, 1505-15 under Albuquerque; lost to England, which gave it to Persia in the 17th century.Aden (entry to Red Sea) — Unsuccessfully attacked by Portugal (1513-30); taken by Turks in 1538.• India• Ceylon (Sri Lanka)—Taken by 1516; lost to Dutch after 1600.• Bombay—Taken in 16th century; given to England in 1661 treaty as part of Catherine of Braganza's dowry for Charles II.• East Indies• Moluccas—Taken by 1520; possession confirmed in 1529 Saragossa treaty with Spain; lost to Dutch after 1600; only East Timor remaining.After the restoration of Portuguese independence from Spain in 1640, Portugal proceeded to revive and strengthen the Anglo- Portuguese Alliance, with international aid to fight off further Spanish threats to Portugal and drive the Dutch invaders out of Brazil and Angola. While Portugal lost its foothold in West Africa at Mina to the Dutch, dominion in Angola was consolidated. The most vital part of the imperial economy was a triangular trade: slaves from West Africa and from the coasts of Congo and Angola were shipped to plantations in Brazil; raw materials (sugar, tobacco, gold, diamonds, dyes) were sent to Lisbon; Lisbon shipped Brazil colonists and hardware. Part of Portugal's War of Restoration against Spain (1640-68) and its reclaiming of Brazil and Angola from Dutch intrusions was financed by the New Christians (Jews converted to Christianity after the 1496 Manueline order of expulsion of Jews) who lived in Portugal, Holland and other low countries, France, and Brazil. If the first empire was mainly an African coastal and Asian empire, the second empire was primarily a Brazilian empire.Portugal's third overseas empire began upon the traumatic independence of Brazil, the keystone of the Lusitanian enterprise, in 1822. The loss of Brazil greatly weakened Portugal both as a European power and as an imperial state, for the scattered remainder of largely coastal, poor, and uncolonized territories that stretched from the bulge of West Africa to East Timor in the East Indies and Macau in south China were more of a financial liability than an asset. Only two small territories balanced their budgets occasionally or made profits: the cocoa islands of São Tomé and Príncipe in the Gulf of Guinea and tiny Macau, which lost much of its advantage as an entrepot between the West and the East when the British annexed neighboring Hong Kong in 1842. The others were largely burdens on the treasury. The African colonies were strapped by a chronic economic problem: at a time when the slave trade and then slavery were being abolished under pressures from Britain and other Western powers, the economies of Guinea- Bissau, São Tomé/Príncipe, Angola, and Mozambique were totally dependent on revenues from the slave trade and slavery. During the course of the 19th century, Lisbon began a program to reform colonial administration in a newly rejuvenated African empire, where most of the imperial efforts were expended, by means of replacing the slave trade and slavery, with legitimate economic activities.Portugal participated in its own early version of the "Scramble" for Africa's interior during 1850-69, but discovered that the costs of imperial expansion were too high to allow effective occupation of the hinterlands. After 1875, Portugal participated in the international "Scramble for Africa" and consolidated its holdings in west and southern Africa, despite the failure of the contra-costa (to the opposite coast) plan, which sought to link up the interiors of Angola and Mozambique with a corridor in central Africa. Portugal's expansion into what is now Malawi, Zambia, and Zimbabwe (eastern section) in 1885-90 was thwarted by its oldest ally, Britain, under pressure from interest groups in South Africa, Scotland, and England. All things considered, Portugal's colonizing resources and energies were overwhelmed by the African empire it possessed after the frontier-marking treaties of 1891-1906. Lisbon could barely administer the massive area of five African colonies, whose total area comprised about 8 percent of the area of the colossal continent. The African territories alone were many times the size of tiny Portugal and, as of 1914, Portugal was the third colonial power in terms of size of area possessed in the world.The politics of Portugal's empire were deceptive. Lisbon remained obsessed with the fear that rival colonial powers, especially Germany and Britain, would undermine and then dismantle her African empire. This fear endured well into World War II. In developing and keeping her potentially rich African territories (especially mineral-rich Angola and strategically located Mozambique), however, the race against time was with herself and her subject peoples. Two major problems, both chronic, prevented Portugal from effective colonization (i.e., settling) and development of her African empire: the economic weakness and underdevelopment of the mother country and the fact that the bulk of Portuguese emigration after 1822 went to Brazil, Venezuela, the United States, and France, not to the colonies. These factors made it difficult to consolidate imperial control until it was too late; that is, until local African nationalist movements had organized and taken the field in insurgency wars that began in three of the colonies during the years 1961-64.Portugal's belated effort to revitalize control and to develop, in the truest sense of the word, Angola and Mozambique after 1961 had to be set against contemporary events in Europe, Africa, and Asia. While Portugal held on to a backward empire, other European countries like Britain, France, and Belgium were rapidly decolonizing their empires. Portugal's failure or unwillingness to divert the large streams of emigrants to her empire after 1850 remained a constant factor in this question. Prophetic were the words of the 19th-century economist Joaquim Oliveira Martins, who wrote in 1880 that Brazil was a better colony for Portugal than Africa and that the best colony of all would have been Portugal itself. As of the day of the Revolution of 25 April 1974, which sparked the final process of decolonization of the remainder of Portugal's third overseas empire, the results of the colonization program could be seen to be modest compared to the numbers of Portuguese emigrants outside the empire. Moreover, within a year, of some 600,000 Portuguese residing permanently in Angola and Mozambique, all but a few thousand had fled to South Africa or returned to Portugal.In 1974 and 1975, most of the Portuguese empire was decolonized or, in the case of East Timor, invaded and annexed by a foreign power before it could consolidate its independence. Only historic Macau, scheduled for transfer to the People's Republic of China in 1999, remained nominally under Portuguese control as a kind of footnote to imperial history. If Portugal now lacked a conventional overseas empire and was occupied with the challenges of integration in the European Union (EU), Lisbon retained another sort of informal dependency that was a new kind of empire: the empire of her scattered overseas Portuguese communities from North America to South America. Their numbers were at least six times greater than that of the last settlers of the third empire.Historical dictionary of Portugal > Empire, Portuguese overseas
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7 Edison, Thomas Alva
SUBJECT AREA: Architecture and building, Automotive engineering, Electricity, Electronics and information technology, Metallurgy, Photography, film and optics, Public utilities, Recording, Telecommunications[br]b. 11 February 1847 Milan, Ohio, USAd. 18 October 1931 Glenmont[br]American inventor and pioneer electrical developer.[br]He was the son of Samuel Edison, who was in the timber business. His schooling was delayed due to scarlet fever until 1855, when he was 8½ years old, but he was an avid reader. By the age of 14 he had a job as a newsboy on the railway from Port Huron to Detroit, a distance of sixty-three miles (101 km). He worked a fourteen-hour day with a stopover of five hours, which he spent in the Detroit Free Library. He also sold sweets on the train and, later, fruit and vegetables, and was soon making a profit of $20 a week. He then started two stores in Port Huron and used a spare freight car as a laboratory. He added a hand-printing press to produce 400 copies weekly of The Grand Trunk Herald, most of which he compiled and edited himself. He set himself to learn telegraphy from the station agent at Mount Clements, whose son he had saved from being run over by a freight car.At the age of 16 he became a telegraphist at Port Huron. In 1863 he became railway telegraphist at the busy Stratford Junction of the Grand Trunk Railroad, arranging a clock with a notched wheel to give the hourly signal which was to prove that he was awake and at his post! He left hurriedly after failing to hold a train which was nearly involved in a head-on collision. He usually worked the night shift, allowing himself time for experiments during the day. His first invention was an arrangement of two Morse registers so that a high-speed input could be decoded at a slower speed. Moving from place to place he held many positions as a telegraphist. In Boston he invented an automatic vote recorder for Congress and patented it, but the idea was rejected. This was the first of a total of 1180 patents that he was to take out during his lifetime. After six years he resigned from the Western Union Company to devote all his time to invention, his next idea being an improved ticker-tape machine for stockbrokers. He developed a duplex telegraphy system, but this was turned down by the Western Union Company. He then moved to New York.Edison found accommodation in the battery room of Law's Gold Reporting Company, sleeping in the cellar, and there his repair of a broken transmitter marked him as someone of special talents. His superior soon resigned, and he was promoted with a salary of $300 a month. Western Union paid him $40,000 for the sole rights on future improvements on the duplex telegraph, and he moved to Ward Street, Newark, New Jersey, where he employed a gathering of specialist engineers. Within a year, he married one of his employees, Mary Stilwell, when she was only 16: a daughter, Marion, was born in 1872, and two sons, Thomas and William, in 1876 and 1879, respectively.He continued to work on the automatic telegraph, a device to send out messages faster than they could be tapped out by hand: that is, over fifty words per minute or so. An earlier machine by Alexander Bain worked at up to 400 words per minute, but was not good over long distances. Edison agreed to work on improving this feature of Bain's machine for the Automatic Telegraph Company (ATC) for $40,000. He improved it to a working speed of 500 words per minute and ran a test between Washington and New York. Hoping to sell their equipment to the Post Office in Britain, ATC sent Edison to England in 1873 to negotiate. A 500-word message was to be sent from Liverpool to London every half-hour for six hours, followed by tests on 2,200 miles (3,540 km) of cable at Greenwich. Only confused results were obtained due to induction in the cable, which lay coiled in a water tank. Edison returned to New York, where he worked on his quadruplex telegraph system, tests of which proved a success between New York and Albany in December 1874. Unfortunately, simultaneous negotiation with Western Union and ATC resulted in a lawsuit.Alexander Graham Bell was granted a patent for a telephone in March 1876 while Edison was still working on the same idea. His improvements allowed the device to operate over a distance of hundreds of miles instead of only a few miles. Tests were carried out over the 106 miles (170 km) between New York and Philadelphia. Edison applied for a patent on the carbon-button transmitter in April 1877, Western Union agreeing to pay him $6,000 a year for the seventeen-year duration of the patent. In these years he was also working on the development of the electric lamp and on a duplicating machine which would make up to 3,000 copies from a stencil. In 1876–7 he moved from Newark to Menlo Park, twenty-four miles (39 km) from New York on the Pennsylvania Railway, near Elizabeth. He had bought a house there around which he built the premises that would become his "inventions factory". It was there that he began the use of his 200- page pocket notebooks, each of which lasted him about two weeks, so prolific were his ideas. When he died he left 3,400 of them filled with notes and sketches.Late in 1877 he applied for a patent for a phonograph which was granted on 19 February 1878, and by the end of the year he had formed a company to manufacture this totally new product. At the time, Edison saw the device primarily as a business aid rather than for entertainment, rather as a dictating machine. In August 1878 he was granted a British patent. In July 1878 he tried to measure the heat from the solar corona at a solar eclipse viewed from Rawlins, Wyoming, but his "tasimeter" was too sensitive.Probably his greatest achievement was "The Subdivision of the Electric Light" or the "glow bulb". He tried many materials for the filament before settling on carbon. He gave a demonstration of electric light by lighting up Menlo Park and inviting the public. Edison was, of course, faced with the problem of inventing and producing all the ancillaries which go to make up the electrical system of generation and distribution-meters, fuses, insulation, switches, cabling—even generators had to be designed and built; everything was new. He started a number of manufacturing companies to produce the various components needed.In 1881 he built the world's largest generator, which weighed 27 tons, to light 1,200 lamps at the Paris Exhibition. It was later moved to England to be used in the world's first central power station with steam engine drive at Holborn Viaduct, London. In September 1882 he started up his Pearl Street Generating Station in New York, which led to a worldwide increase in the application of electric power, particularly for lighting. At the same time as these developments, he built a 1,300yd (1,190m) electric railway at Menlo Park.On 9 August 1884 his wife died of typhoid. Using his telegraphic skills, he proposed to 19-year-old Mina Miller in Morse code while in the company of others on a train. He married her in February 1885 before buying a new house and estate at West Orange, New Jersey, building a new laboratory not far away in the Orange Valley.Edison used direct current which was limited to around 250 volts. Alternating current was largely developed by George Westinghouse and Nicola Tesla, using transformers to step up the current to a higher voltage for long-distance transmission. The use of AC gradually overtook the Edison DC system.In autumn 1888 he patented a form of cinephotography, the kinetoscope, obtaining film-stock from George Eastman. In 1893 he set up the first film studio, which was pivoted so as to catch the sun, with a hinged roof which could be raised. In 1894 kinetoscope parlours with "peep shows" were starting up in cities all over America. Competition came from the Latham Brothers with a screen-projection machine, which Edison answered with his "Vitascope", shown in New York in 1896. This showed pictures with accompanying sound, but there was some difficulty with synchronization. Edison also experimented with captions at this early date.In 1880 he filed a patent for a magnetic ore separator, the first of nearly sixty. He bought up deposits of low-grade iron ore which had been developed in the north of New Jersey. The process was a commercial success until the discovery of iron-rich ore in Minnesota rendered it uneconomic and uncompetitive. In 1898 cement rock was discovered in New Village, west of West Orange. Edison bought the land and started cement manufacture, using kilns twice the normal length and using half as much fuel to heat them as the normal type of kiln. In 1893 he met Henry Ford, who was building his second car, at an Edison convention. This started him on the development of a battery for an electric car on which he made over 9,000 experiments. In 1903 he sold his patent for wireless telegraphy "for a song" to Guglielmo Marconi.In 1910 Edison designed a prefabricated concrete house. In December 1914 fire destroyed three-quarters of the West Orange plant, but it was at once rebuilt, and with the threat of war Edison started to set up his own plants for making all the chemicals that he had previously been buying from Europe, such as carbolic acid, phenol, benzol, aniline dyes, etc. He was appointed President of the Navy Consulting Board, for whom, he said, he made some forty-five inventions, "but they were pigeonholed, every one of them". Thus did Edison find that the Navy did not take kindly to civilian interference.In 1927 he started the Edison Botanic Research Company, founded with similar investment from Ford and Firestone with the object of finding a substitute for overseas-produced rubber. In the first year he tested no fewer than 3,327 possible plants, in the second year, over 1,400, eventually developing a variety of Golden Rod which grew to 14 ft (4.3 m) in height. However, all this effort and money was wasted, due to the discovery of synthetic rubber.In October 1929 he was present at Henry Ford's opening of his Dearborn Museum to celebrate the fiftieth anniversary of the incandescent lamp, including a replica of the Menlo Park laboratory. He was awarded the Congressional Gold Medal and was elected to the American Academy of Sciences. He died in 1931 at his home, Glenmont; throughout the USA, lights were dimmed temporarily on the day of his funeral.[br]Principal Honours and DistinctionsMember of the American Academy of Sciences. Congressional Gold Medal.Further ReadingM.Josephson, 1951, Edison, Eyre \& Spottiswode.R.W.Clark, 1977, Edison, the Man who Made the Future, Macdonald \& Jane.IMcN
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