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obtained+information

  • 81 obtain

    ob·tain [əbʼteɪn]
    ( form) vt
    to \obtain sth [from sb] ( to be given) etw [von jdm] bekommen [o erhalten]; ( to go and get) sich dat etw [von jdm] verschaffen;
    iron is \obtained from iron ore Eisen wird aus Eisenerz gewonnen;
    to \obtain information sich dat Informationen verschaffen;
    to \obtain permission eine Erlaubnis erhalten;
    you must first \obtain permission Sie müssen sich erst eine Genehmigung besorgen;
    impossible to \obtain nicht erhältlich vi conditions herrschen; rules gelten, in Kraft sein

    English-German students dictionary > obtain

  • 82 second-hand

    'sec·ond-hand adj
    1) inv ( used) gebraucht; clothes secondhand;
    \second-hand car Gebrauchtwagen m;
    \second-hand clothes Secondhandkleidung f
    2) attr, inv ( for second-hand goods) Gebraucht-, Secondhand-;
    \second-hand bookshop Antiquariat nt;
    \second-hand car dealer[s] Gebrauchtwagenhändler(in) m(f);
    \second-hand dealer Altwarenhändler(in) m(f);
    \second-hand shop Secondhandladen m, Secondhandshop m
    3) inv ( obtained from sb else) information, experience, knowledge aus zweiter Hand nach n adv
    1) ( in used condition) gebraucht
    2) ( from third party) aus zweiter Hand;
    to hear [or learn] about sth \second-hand etw aus zweiter Hand erfahren

    English-German students dictionary > second-hand

  • 83 source

    [sɔ:s, Am sɔ:rs] n
    1) ( origin) Quelle f; ( reason) Grund m (of für +akk);
    oranges are a good \source of Vitamin C Orangen sind reich an Vitamin C;
    to be a \source of disappointment/ embarrassment to sb jdn ständig enttäuschen/in Verlegenheit bringen;
    energy/light \source Energie-/Lichtquelle f;
    a \source of inspiration eine Quelle der Inspiration ( geh)
    to be a \source of pride for sb jdn stolz machen;
    to trace sth back to its \source etw an seinen Ursprung zurückverfolgen;
    to track down [or trace] the \source of sth den Ursprung einer S. gen zurückverfolgen, die Ursache einer S. gen ausfindig machen;
    at \source an der Quelle;
    tax deducted at \source (Brit, Aus) fin Quellensteuer f;
    to tax at \source Quellensteuer erheben
    2) ( of information) [Informations]quelle f;
    \sources pl lit (for article, essay) Quellen[angaben] fpl, Literaturangaben fpl;
    primary/secondary \sources Primär-/Sekundärliteratur f;
    to list [or acknowledge] one's \sources Quellenangaben machen, die [verwendete] Literatur angeben
    3) usu pl ( person) Quelle f;
    according to Government \sources wie in [o aus] Regierungskreisen verlautete;
    from a reliable \source aus zuverlässiger Quelle;
    well-informed \sources gut unterrichtete Kreise [o informierte Quellen];
    to disclose [or reveal] [or identify] one's \sources seine Quellen preisgeben
    to be \sourced
    1) ( have origin stated) belegt sein;
    the quoted results weren't \sourced zu den zitierten Ergebnissen fehlten die Quellenangaben;
    to \source sth [to sb] auf jdn zurückgehen
    2) econ ( be obtained) stammen;
    the produce used in our restaurant is very carefully \sourced die in unserem Restaurant verwendeten Produkte werden sorgfältig nach ihrer Herkunft ausgewählt

    English-German students dictionary > source

  • 84 fruits of the poisonous tree

    fruits of the poisonous tree (infrml, AE) LAW, POL (infrml) vergiftete Früchte fpl (information obtained by devious means; unrechtmäßig erschlichene Informationen oder Leistungen)

    Englisch-Deutsch Fachwörterbuch der Wirtschaft > fruits of the poisonous tree

  • 85 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) vytáhnout
    2) (to select (passages from a book etc).) vypsat si
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) extrahovat
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) výtah
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) výtažek
    •
    * * *
    • těžit
    • výtažek
    • vytěžit
    • vyluhovat
    • vytahovat
    • výtah
    • vyloudit
    • extrakt
    • extrahovat
    • koncentrát
    • dobývat

    English-Czech dictionary > extract

  • 86 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) vytiahnuť
    2) (to select (passages from a book etc).) vypísať si
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) extrahovať
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) výťah
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) výťažok
    •
    * * *
    • vynímat
    • výtažok
    • vynikat
    • vytiahnut
    • výnatok
    • vybrat
    • vytrhnút
    • úryvok
    • extrahovat

    English-Slovak dictionary > extract

  • 87 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) a scoate
    2) (to select (passages from a book etc).) a ex­trage
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) a extrage
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) ex­tras
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) ex­tract
    •

    English-Romanian dictionary > extract

  • 88 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) εξάγω,αποσπώ
    2) (to select (passages from a book etc).) διαλέγω
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) εξάγω, εκχυλίζω
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) απόσπασμα
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) εκχύλισμα
    •

    English-Greek dictionary > extract

  • 89 obtain

    vt.
    obtener, conseguir (information, money)
    vi.
    prevalecer (Formal) (practice, rule) (pt & pp obtained)

    Nuevo Diccionario Inglés-Español > obtain

  • 90 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) arracher, tirer (de)
    2) (to select (passages from a book etc).) extraire
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) extraire
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) extrait
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) extrait
    •

    English-French dictionary > extract

  • 91 extract

    1. [ik'strækt] verb
    1) (to pull out, or draw out, especially by force or with effort: I have to have a tooth extracted; Did you manage to extract the information from her?) extrair
    2) (to select (passages from a book etc).) extrair
    3) (to take out (a substance forming part of something else) by crushing or by chemical means: Vanilla essence is extracted from vanilla beans.) extrair
    2. ['ekstrækt] noun
    1) (a passage selected from a book etc: a short extract from his novel.) extrato, excerto
    2) (a substance obtained by an extracting process: beef/yeast extract; extract of malt.) extrato
    •

    English-Portuguese (Brazil) dictionary > extract

  • 92 Armstrong, Edwin Howard

    [br]
    b. 18 December 1890 New York City, New York, USA
    d. 31 January 1954 New York City, New York, USA
    [br]
    American engineer who invented the regenerative and superheterodyne amplifiers and frequency modulation, all major contributions to radio communication and broadcasting.
    [br]
    Interested from childhood in anything mechanical, as a teenager Armstrong constructed a variety of wireless equipment in the attic of his parents' home, including spark-gap transmitters and receivers with iron-filing "coherer" detectors capable of producing weak Morse-code signals. In 1912, while still a student of engineering at Columbia University, he applied positive, i.e. regenerative, feedback to a Lee De Forest triode amplifier to just below the point of oscillation and obtained a gain of some 1,000 times, giving a receiver sensitivity very much greater than hitherto possible. Furthermore, by allowing the circuit to go into full oscillation he found he could generate stable continuous-waves, making possible the first reliable CW radio transmitter. Sadly, his claim to priority with this invention, for which he filed US patents in 1913, the year he graduated from Columbia, led to many years of litigation with De Forest, to whom the US Supreme Court finally, but unjustly, awarded the patent in 1934. The engineering world clearly did not agree with this decision, for the Institution of Radio Engineers did not revoke its previous award of a gold medal and he subsequently received the highest US scientific award, the Franklin Medal, for this discovery.
    During the First World War, after some time as an instructor at Columbia University, he joined the US Signal Corps laboratories in Paris, where in 1918 he invented the superheterodyne, a major contribution to radio-receiver design and for which he filed a patent in 1920. The principle of this circuit, which underlies virtually all modern radio, TV and radar reception, is that by using a local oscillator to convert, or "heterodyne", a wanted signal to a lower, fixed, "intermediate" frequency it is possible to obtain high amplification and selectivity without the need to "track" the tuning of numerous variable circuits.
    Returning to Columbia after the war and eventually becoming Professor of Electrical Engineering, he made a fortune from the sale of his patent rights and used part of his wealth to fund his own research into further problems in radio communication, particularly that of receiver noise. In 1933 he filed four patents covering the use of wide-band frequency modulation (FM) to achieve low-noise, high-fidelity sound broadcasting, but unable to interest RCA he eventually built a complete broadcast transmitter at his own expense in 1939 to prove the advantages of his system. Unfortunately, there followed another long battle to protect and exploit his patents, and exhausted and virtually ruined he took his own life in 1954, just as the use of FM became an established technique.
    [br]
    Principal Honours and Distinctions
    Institution of Radio Engineers Medal of Honour 1917. Franklin Medal 1937. IERE Edison Medal 1942. American Medal for Merit 1947.
    Bibliography
    1922, "Some recent developments in regenerative circuits", Proceedings of the Institute of Radio Engineers 10:244.
    1924, "The superheterodyne. Its origin, developments and some recent improvements", Proceedings of the Institute of Radio Engineers 12:549.
    1936, "A method of reducing disturbances in radio signalling by a system of frequency modulation", Proceedings of the Institute of Radio Engineers 24:689.
    Further Reading
    L.Lessing, 1956, Man of High-Fidelity: Edwin Howard Armstrong, pbk 1969 (the only definitive biography).
    W.R.Maclaurin and R.J.Harman, 1949, Invention \& Innovation in the Radio Industry.
    J.R.Whitehead, 1950, Super-regenerative Receivers.
    A.N.Goldsmith, 1948, Frequency Modulation (for the background to the development of frequency modulation, in the form of a large collection of papers and an extensive bibliog raphy).
    KF

    Biographical history of technology > Armstrong, Edwin Howard

  • 93 Berezin, Evelyn

    [br]
    b. 1925 New York, USA
    [br]
    American pioneer in computer technology.
    [br]
    Born into a poor family in the Bronx, New York City, Berezin first majored in business studies but transferred her interest to physics. She graduated in 1946 and then, with the aid of an Atomic Energy Commission fellowship, she obtained her PhD in cosmic ray physics at New York University. When the fellowship expired, opportunities in the developing field of electronic data processing seemed more promising than thise in physics. Berezin entered the firm of Electronic Computer Corporation in 1951 and was asked to "build a computer", although few at that time had actually seen one; the result was the Elecom 200. In 1953, for Underwood Corporation, she designed the first office computer, although it was never marketed, as Underwood sold out to Olivetti.
    Berezin's next position was as head of logic design for Teleregister Corporation in the late 1950s. Here, she led a team specializing in the design of on-line systems. Her most notable achievement was the design of a nationwide online computer reservation system for United Airlines, the first system of this kind and the precursor of similar on-line systems. It was installed in the early 1960s and was the first large non-military on-line interactive system.
    In the 1960s Berezin moved to the Digitronics Corporation as manager of logic design, her work here resulted in the first high-speed commercial digital communications terminal. Also in the 1960s, her involvement in Data Secretary, a challenger to the IBM editing typewriter, makes it possible to regard her as one of the pioneers of word processing. In 1976 Berezin transferred from the electronic data and computing field to that of financial management.
    [br]
    Further Reading
    A.Stanley, 1993, Mothers and Daughters of Invention, Meruchen, NJ: Scarecrow Press, 651–3.
    LRD

    Biographical history of technology > Berezin, Evelyn

  • 94 Boot, Henry Albert Howard

    [br]
    b. 29 July 1917 Birmingham, England
    d. 8 February 1983 Cambridge, England
    [br]
    English physicist who, with John Randall, invented the cavity magnetron used in radar systems.
    [br]
    After secondary education at King Edward School, Birmingham, Boot studied physics at Birmingham University, obtaining his BSc in 1938 and PhD in 1941. With the outbreak of the Second World War, he became involved with Randall and others in the development of a source of microwave power suitable for use in radar transmitters. Following unsuccessful attempts to use klystrons, they turned to investigation of the magnetron, and by adding cavity resonators they obtained useful power on 21 February 1940 at a wavelength of 9.8 cm. By May a cavity magnetron radar system had been constructed at TRE, Swanage, and in September submarine periscopes were detected at a range of 7 miles (11 km).
    In 1943 the physics department at Birmingham resumed its research in atomic physics and Boot moved to BTH at Rugby to continue development of magnetrons, but in 1945 he returned to Birmingham as Nuffield Research Fellow and helped construct the cyclotron there. Three years later he took up a post as a Principal Scientific Officer (PSO) at the Services Electronic Research Laboratories at Baldock, Hertfordshire, becoming a Senior PSO in 1954. He remained there until his retirement in 1977, variously carrying out research on microwaves, magnetrons, plasma physics and lasers.
    [br]
    Principal Honours and Distinctions
    Royal Society of Arts Thomas Gray Memorial Prize 1943. Royal Commission Inventors Award 1946. Franklin Institute John Price Wetherill Medal 1958. City of Pennsylvania John Scott Award 1959. (All jointly with Randall.)
    Bibliography
    1976, with J.T.Randall, "Historical notes on the cavity magnetron", Transactions of the Institute of Electrical and Electronics Engineers ED-23: 724 (provides an account of their development of the cavity magnetron).
    Further Reading
    E.H.Dix and W.H.Aldous, 1966, Microwave Valves.
    KF

    Biographical history of technology > Boot, Henry Albert Howard

  • 95 Brattain, Walter Houser

    [br]
    b. 10 February 1902 Amoy, China (now Hsiamen)
    d. 13 October 1987 Seattle, Washington, USA
    [br]
    American physicist and co-inventor of the transistor.
    [br]
    Born of American parents in China, he was brought up on a cattle-ranch and graduated from Whitman College, Walla Walla, Washington, in 1924. He then went to the University of Minnesota, where he obtained a PhD in 1929. The same year he joined the staff of Bell Telephone Laboratories as a research physicist and there, during the First World War, he worked on the magnetic detection of submarines. For his work on the invention and development of the transistor, he was awarded the 1956 Nobel Prize for Physics jointly with John Bardeen and William Shockley. He retired in 1967. His interests have been concentrated on the properties of semiconductors such as germanium and silicon.
    [br]
    Principal Honours and Distinctions
    Nobel Prize for Physics (jointly with Bardeen and Shockley) 1956.
    Further Reading
    Isaacs and E.Martin (eds), 1985, Longmans Dictionary of 20th Century Biography.
    IMcN

    Biographical history of technology > Brattain, Walter Houser

  • 96 Colpitts, Edwin Henry

    [br]
    b. 9 January 1872 Pointe de Bute, Canada
    d. 6 March 1949 Orange, New Jersey, USA
    [br]
    Canadian physicist and electrical engineer responsible for important developments in electronic-circuit technology.
    [br]
    Colpitts obtained Bachelor's degrees at Mount Allison University, Sackville, New Brunswick, and Harvard in 1894 and 1896, respectively, followed by a Master's degree at Harvard in 1897. After two years as assistant to the professor of physics there, he joined the American Bell Telephone Company. When the Bell Company was reorganized in 1907, he moved to the Western Electric branch of the company in New York as Head of the Physical Laboratories. In 1911 he became a director of the Research Laboratories, and in 1917 he became Assistant Chief Engineer of the company. During this time he invented both the push-pull amplifier and the Colpitts oscillator, both major developments in communications. In 1917, during the First World War, he spent some time in France helping to set up the US Signal Corps Research Laboratories. Afterwards he continued to do much, both technically and as a manager, to place telephone communications on a firm scientific basis, retiring as Vice-President of the Bell Telephone Laboratories in 1937. With the outbreak of the Second World War in 1941 he was recalled from retirement and appointed Director of the Engineering Foundation to work on submarine warfare techniques, particularly echo-ranging.
    [br]
    Principal Honours and Distinctions
    Order of the Rising Sun, Japan, 1938. US Medal of Merit 1948.
    Bibliography
    1919, with E.B.Craft, "Radio telephony", Proceedings of the American Institution of Electrical Engineers 38:337.
    1921, with O.B.Blackwell, "Carrier current telephony and telegraphy", American Institute of Electrical Engineers Transactions 40:205.
    11 September 1915, US reissue patent no. 15,538 (control device for radio signalling).
    28 August 1922, US patent no. 1,479,638 (multiple signal reception).
    Further Reading
    M.D.Fagen, 1975, A History of Engineering \& Science in the Bell System, Vol. 1, Bell Laboratories.
    KF

    Biographical history of technology > Colpitts, Edwin Henry

  • 97 Eccles, William Henry

    [br]
    b. 23 August 1875 Ulverston, Cumbria, England
    d. 27 April 1966 Oxford, England
    [br]
    English physicist who made important contributions to the development of radio communications.
    [br]
    After early education at home and at private school, Eccles won a scholarship to the Royal College of Science (now Imperial College), London, where he gained a First Class BSc in physics in 1898. He then worked as a demonstrator at the college and studied coherers, for which he obtained a DSc in 1901. Increasingly interested in electrical engineering, he joined the Marconi Company in 1899 to work on oscillators at the Poole experimental radio station, but in 1904 he returned to academic life as Professor of Mathematics and Physics and Department Head at South West Polytechnic, Chelsea. There he discovered ways of using the negative resistance of galena-crystal detectors to generate oscillations and gave a mathematical description of the operation of the triode valve. In 1910 he became Reader in Engineering at University College, London, where he published a paper explaining the reflection of radio waves by the ionosphere and designed a 60 MHz short-wave transmitter. From 1916 to 1926 he was Professor of Applied Physics and Electrical Engineering at the Finsbury City \& Guilds College and a private consulting engineer. During the First World War he was a military scientific adviser and Secretary to the Joint Board of Scientific Societies. After the war he made many contributions to electronic-circuit development, many of them (including the Eccles-Jordan "flip-flop" patented in 1918 and used in binary counters) in conjunction with F.W.Jordan, about whom little seems to be known. Illness forced Eccles's premature academic retirement in 1926, but he remained active as a consultant for many years.
    [br]
    Principal Honours and Distinctions
    FRS 1921. President, Institution of Electrical Engineers, 1926–7. President, Physical Society 1929. President, Radio Society of Great Britain.
    Bibliography
    1912, "On the diurnal variation of the electric waves occurring in nature and on the propagation of electric waves round the bend of the earth", Proceedings of the Royal Society 87:79. 1919, with F.W.Jordan, "Method of using two triode valves in parallel for generating oscillations", Electrician 299:3.
    1915, Handbook of Wireless Telegraphy.
    1921, Continuous Wave Wireless Telegraphy.
    Further Reading
    1971, "William Henry Eccles, 1875–1966", Biographical Memoirs of the Royal Society, London, 17.
    KF

    Biographical history of technology > Eccles, William Henry

  • 98 Edison, Thomas Alva

    [br]
    b. 11 February 1847 Milan, Ohio, USA
    d. 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 Distinctions
    Member of the American Academy of Sciences. Congressional Gold Medal.
    Further Reading
    M.Josephson, 1951, Edison, Eyre \& Spottiswode.
    R.W.Clark, 1977, Edison, the Man who Made the Future, Macdonald \& Jane.
    IMcN

    Biographical history of technology > Edison, Thomas Alva

  • 99 Edwards, Humphrey

    [br]
    fl. c.1808–25 London (?), England
    d. after 1825 France (?)
    [br]
    English co-developer of Woolf s compound steam engine.
    [br]
    When Arthur Woolf left the Griffin Brewery, London, in October 1808, he formed a partnership with Humphrey Edwards, described as a millwright at Mill Street, Lambeth, where they started an engine works to build Woolf's type of compound engine. A number of small engines were constructed and other ordinary engines modified with the addition of a high-pressure cylinder. Improvements were made in each succeeding engine, and by 1811 a standard form had been evolved. During this experimental period, engines were made with cylinders side by side as well as the more usual layout with one behind the other. The valve gear and other details were also improved. Steam pressure may have been around 40 psi (2.8 kg/cm2). In an advertisement of February 1811, the partners claimed that their engines had been brought to such a state of perfection that they consumed only half the quantity of coal required for engines on the plan of Messrs Boulton \& Watt. Woolf visited Cornwall, where he realized that more potential for his engines lay there than in London; in May 1811 the partnership was dissolved, with Woolf returning to his home county. Edwards struggled on alone in London for a while, but when he saw a more promising future for the engine in France he moved to Paris. On 25 May 1815 he obtained a French patent, a Brevet d'importation, for ten years. A report in 1817 shows that during the previous two years he had imported into France fifteen engines of different sizes which were at work in eight places in various parts of the country. He licensed a mining company in the north of France to make twenty-five engines for winding coal. In France there was always much more interest in rotative engines than pumping ones. Edwards may have formed a partnership with Goupil \& Cie, Dampierre, to build engines, but this is uncertain. He became a member of the firm Scipion, Perrier, Edwards \& Chappert, which took over the Chaillot Foundry of the Perrier Frères in Paris, and it seems that Edwards continued to build steam engines there for the rest of his life. In 1824 it was claimed that he had made about 100 engines in England and another 200 in France, but this is probably an exaggeration.
    The Woolf engine acquired its popularity in France because its compound design was more economical than the single-cylinder type. To enable it to be operated safely, Edwards first modified Woolf s cast-iron boiler in 1815 by placing two small drums over the fire, and then in 1825 replaced the cast iron with wrought iron. The modified boiler was eventually brought back to England in the 1850s as the "French" or "elephant" boiler.
    [br]
    Further Reading
    Most details about Edwards are to be found in the biographies of his partner, Arthur Woolf. For example, see T.R.Harris, 1966, Arthur Woolf, 1766–1837, The Cornish Engineer, Truro: D.Bradford Barton; Rhys Jenkins, 1932–3, "A Cornish Engineer, Arthur Woolf, 1766–1837", Transactions of the Newcomen Society 13. These use information from the originally unpublished part of J.Farey, 1971, A Treatise on the Steam Engine, Vol. II, Newton Abbot: David \& Charles.
    RLH

    Biographical history of technology > Edwards, Humphrey

  • 100 Garforth, William Edward

    [br]
    b. 1845 Dukinfield, Cheshire, England
    d. 1 October 1921 Pontefract, Yorkshire, England
    [br]
    English colliery manager, pioneer in machine-holing and the safety of mines.
    [br]
    After Menzies conceived his idea of breaking off coal with machines in 1761, many inventors subsequently followed his proposals through into the practice of underground working. More than one century later, Garforth became one of the principal pioneers of machine-holing combined with the longwall method of working in order to reduce production costs and increase the yield of coal. Having been appointed agent to Pope \& Pearson's Collieries, West Yorkshire, in 1879, of which company he later became Managing Director and Chairman, he gathered a great deal of experience with different methods of cutting coal. The first disc machine was exhibited in London as early as 1851, and ten years later a pick machine was invented. In 1893 he introduced an improved type of deep undercutting machine, his "diamond" disc coal-cutter, driven by compressed air, which also became popular on the European continent.
    Besides the considerable economic advantages it created, the use of machinery for mining coal increased the safety of working in hard and thin seams. The improvement of safety in mining technology was always his primary concern, and as a result of his inventions and his many publications he became the leading figure in the British coal mining industry at the beginning of the twentieth century; safety lamps still carry his name. In 1885 he invented a firedamp detector, and following a severe explosion in 1886 he concentrated on coal-dust experiments. From the information he obtained of the effect of stone-dust on a coal-dust explosion he proposed the stone-dust remedy to prevent explosions of coal-dust. As a result of discussions which lasted for decades and after he had been entrusted with the job of conducting the British coal-dust experiments, in 1921 an Act made it compulsory in all mines which were not naturally wet throughout to treat all roads with incombustible dust so as to ensure that the dust always consisted of a mixture containing not more than 50 per cent combustible matter. In 1901 Garforth erected a surface gallery which represented the damaged roadways of a mine and could be filled with noxious fumes to test self-contained breathing apparata. This gallery formed the model from which all the rescue-stations existing nowadays have been developed.
    [br]
    Principal Honours and Distinctions
    Knighted 1914. LLD Universities of Birmingham and Leeds 1912. President, Midland Institute 1892–4. President, The Institution of Mining Engineers 1911–14. President, Mining Association of Great Britain 1907–8. Chairman, Standing Committee on Mining, Advisory Council for Scientific and Industrial Research. Fellow of the Geological Society of London. North of England Institute of Mining and Mechanical Engineers Greenwell Silver Medal 1907. Royal Society of Arts Fothergill Gold Medal 1910. Medal of the Institution of Mining Engineers 1914.
    Bibliography
    1901–2, "The application of coal-cutting machines to deep mining", Transactions of the Federated Institute of Mining Engineers 23: 312–45.
    1905–6, "A new apparatus for rescue-work in mines", Transactions of the Institution of Mining Engineers 31:625–57.
    1902, "British Coal-dust Experiments". Paper communicated to the International Congress on Mining, Metallurgy, Applied Mechanics and Practical Geology, Dusseldorf.
    Further Reading
    Garforth's name is frequently mentioned in connection with coal-holing, but his outstanding achievements in improving safety in mines are only described in W.D.Lloyd, 1921, "Memoir", Transactions of the Institution of Mining Engineers 62:203–5.
    WK

    Biographical history of technology > Garforth, William Edward

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