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depth-first+method

  • 1 метод поиска в глубину

    1) Mathematics: depth-first method

    Универсальный русско-английский словарь > метод поиска в глубину

  • 2 grado

    m.
    1 degree.
    grado centígrado degree centigrade
    2 degree.
    quemaduras de primer grado first-degree burns
    mostró un alto grado de preparación he was very well prepared
    en menor grado to a lesser extent o degree
    en grado sumo greatly
    3 grade (rango).
    4 year, class (education).
    5 score, grade.
    pres.indicat.
    1st person singular (yo) present indicative of spanish verb: gradar.
    * * *
    1 (gen) degree
    2 (estado) stage
    3 EDUCACIÓN (curso) class, year, US grade
    5 (peldaño) step
    6 MILITAR rank
    7 LINGÚÍSTICA degree
    \
    de buen grado willingly, with good grace
    de mal grado unwillingly, with bad grace
    en sumo grado to the highest degree
    en tal grado so much so
    * * *
    noun m.
    * * *
    SM
    1) (=nivel) degree

    quemaduras de primer/segundo grado — first-/second-degree burns

    • en alto grado — to a great degree

    • de grado en grado — step by step, by degrees

    • en mayor grado — to a greater degree o extent

    • en menor grado — to a lesser degree o extent

    • en sumo grado o en grado sumo, era humillante en sumo grado — it was humiliating in the extreme

    • en grado superlativo — in the extreme

    • tercer grado (penitenciario) — Esp lowest category within the prison system which allows day release privileges

    2) (Geog, Mat, Fís) degree
    3) [de escalafón] grade; (Mil) rank
    4) (=etapa) stage
    5) esp LAm (Educ) (=curso) year, grade (EEUU); (=título) degree

    colación de grados — Arg conferment of degrees

    6) (Ling) degree of comparison

    adjetivos en grado comparativo — comparative adjectives, comparatives

    adjetivos en grado superlativo — superlative adjectives, superlatives

    7) (=gusto)

    • de (buen) grado — willingly

    • de mal grado — unwillingly

    de grado o por (la) fuerza —

    otros muchos países entraron en guerra, de grado o por la fuerza — many other countries were forced willy-nilly to enter the war

    pues tendrás que ir, de grado o por la fuerza — well you'll have to go, like it or not

    8) [de escalera] step
    9) pl grados (Rel) minor orders
    * * *
    1)
    a) (nivel, cantidad) degree

    el asunto se ha complicado en or (AmL) a tal grado... — things have become so complicated...

    en grado sumo: me preocupó en grado sumo it caused me great concern; nos complace en grado sumo comunicarle que... — it gives us great pleasure to inform you that...

    b) ( de parentesco) degree
    2) ( de escalafón) grade

    de buen/mal grado — willingly/unwillingly

    4)
    a) (Fís, Meteo) degree
    b) (Geog, Mat) degree
    c) (Vin) degree
    5)
    a) (esp AmL) (Educ) (curso, año) year
    b) ( título)
    * * *
    = degree, extent, index [indices/indexes, -pl.], magnitude, range, rate, scale, to what extent, grade, quotient, degree.
    Ex. This degree of standardisation is not the pattern outside of this specific area of application.
    Ex. The extent of searchable elements will vary from one data base to another.
    Ex. As job anxiety scores increased, job satisfaction indices decreased.
    Ex. Only those who have attempted to edit the proceedings of a conference can appreciate the magnitude and scope of such an enterprise.
    Ex. Overall, the library media specialists experienced stress in the mild to moderate range.
    Ex. Whether, in the future, the co-operatives will be able to fund appropriate developments at a sufficiently rapid rate remains an unanswered question.
    Ex. Various scales of relevance ratings may be established.
    Ex. Clearly an index must permit access to a document by its central theme, but, to what extent should access be provided to secondary or subsidiary topics considered within a document?.
    Ex. The project is concerned with the investigation of conditions of appointment for women librarians as well as the grades and salary scales assigned to library tasks.
    Ex. One reads, for instance, that a parameter in assessing the maximum period a user can be kept waiting is the 'aggravation quotient'.
    Ex. In cartography reference system is the method by which one can locate a place on a map, eg (a) degrees of latitude and longitude; (b) a grid reference.
    ----
    * alumno de cuarto grado = fourth grader.
    * asesinato en primer grado = first-degree murder.
    * bebida alcohólica con muchos grados = hard drink, hard liquor.
    * cada vez en mayor grado = ever-increasing.
    * cierto grado de = a degree of.
    * de buen grado = willing, good-humouredly, good-humoured, good-naturedly.
    * de grado básico = junior grade.
    * delito de menor grado = misdemeanour [misdimeanor, -USA].
    * de primer grado = in the first degree.
    * de segundo grado = second-degree, in the second degree.
    * el grado de = the extent of.
    * el grado de + Nombre = the breadth and depth of + Nombre.
    * el grado en que = the extent to which.
    * en cierto grado = something of.
    * en diferente grado = differing, in varying measures.
    * en distinto grado = in varying measures, differing, to varying degrees.
    * en diverso grado = to varying degrees.
    * en diversos grados = to varying extents.
    * en este grado = to this extent.
    * en grado mínimo = minimally.
    * en mayor grado = to a greater degree, a fortiori, to a greater extent, to a larger degree, to a larger extent.
    * en mayor o menor grado = to a greater or lesser degree.
    * en menor grado = to a lesser extent, to a lesser degree.
    * en sumo grado = in the extreme.
    * en tercer grado = in the third degree.
    * en un grado bastante aceptable = to a fair extent.
    * en un grado sumo = in the extreme.
    * escala que consta de nueve grados = nine-point scale.
    * girar 180 grados = move + 180 degrees.
    * grado centígrado (ºC) = degree centigrade (ºC).
    * grado de aceptación = acceptance rate.
    * grado de acidez = pH, ph value.
    * grado de adecuación = degree of fit.
    * grado de citación = citedness.
    * grado de cobertura = depth of coverage.
    * grado de coincidencia entre el tema de un documento y el tema de búsqueda = topicality.
    * grado de compleción = completeness.
    * grado de escepticismo = degree of skepticism.
    * grado de integración = scale of integration.
    * grado de no citación = uncitedness.
    * grado de pertinencia = recall tendency.
    * grado de precisión = degree of detail.
    * grado de proximidad entre dos = betweenness.
    * grado de relación = relatedness measure.
    * grado medio = middle grade.
    * grado superlativo = superlative.
    * hasta tal grado que = so much so that.
    * salón de grados = conference room.
    * tomarse Algo de buen grado = take + Nombre + in good humour.
    * un cierto grado de = a certain amount of, a modicum of.
    * vida + dar un giro de 180 grados = turn + Posesivo + life around.
    * * *
    1)
    a) (nivel, cantidad) degree

    el asunto se ha complicado en or (AmL) a tal grado... — things have become so complicated...

    en grado sumo: me preocupó en grado sumo it caused me great concern; nos complace en grado sumo comunicarle que... — it gives us great pleasure to inform you that...

    b) ( de parentesco) degree
    2) ( de escalafón) grade

    de buen/mal grado — willingly/unwillingly

    4)
    a) (Fís, Meteo) degree
    b) (Geog, Mat) degree
    c) (Vin) degree
    5)
    a) (esp AmL) (Educ) (curso, año) year
    b) ( título)
    * * *
    = degree, extent, index [indices/indexes, -pl.], magnitude, range, rate, scale, to what extent, grade, quotient, degree.

    Ex: This degree of standardisation is not the pattern outside of this specific area of application.

    Ex: The extent of searchable elements will vary from one data base to another.
    Ex: As job anxiety scores increased, job satisfaction indices decreased.
    Ex: Only those who have attempted to edit the proceedings of a conference can appreciate the magnitude and scope of such an enterprise.
    Ex: Overall, the library media specialists experienced stress in the mild to moderate range.
    Ex: Whether, in the future, the co-operatives will be able to fund appropriate developments at a sufficiently rapid rate remains an unanswered question.
    Ex: Various scales of relevance ratings may be established.
    Ex: Clearly an index must permit access to a document by its central theme, but, to what extent should access be provided to secondary or subsidiary topics considered within a document?.
    Ex: The project is concerned with the investigation of conditions of appointment for women librarians as well as the grades and salary scales assigned to library tasks.
    Ex: One reads, for instance, that a parameter in assessing the maximum period a user can be kept waiting is the 'aggravation quotient'.
    Ex: In cartography reference system is the method by which one can locate a place on a map, eg (a) degrees of latitude and longitude; (b) a grid reference.
    * alumno de cuarto grado = fourth grader.
    * asesinato en primer grado = first-degree murder.
    * bebida alcohólica con muchos grados = hard drink, hard liquor.
    * cada vez en mayor grado = ever-increasing.
    * cierto grado de = a degree of.
    * de buen grado = willing, good-humouredly, good-humoured, good-naturedly.
    * de grado básico = junior grade.
    * delito de menor grado = misdemeanour [misdimeanor, -USA].
    * de primer grado = in the first degree.
    * de segundo grado = second-degree, in the second degree.
    * el grado de = the extent of.
    * el grado de + Nombre = the breadth and depth of + Nombre.
    * el grado en que = the extent to which.
    * en cierto grado = something of.
    * en diferente grado = differing, in varying measures.
    * en distinto grado = in varying measures, differing, to varying degrees.
    * en diverso grado = to varying degrees.
    * en diversos grados = to varying extents.
    * en este grado = to this extent.
    * en grado mínimo = minimally.
    * en mayor grado = to a greater degree, a fortiori, to a greater extent, to a larger degree, to a larger extent.
    * en mayor o menor grado = to a greater or lesser degree.
    * en menor grado = to a lesser extent, to a lesser degree.
    * en sumo grado = in the extreme.
    * en tercer grado = in the third degree.
    * en un grado bastante aceptable = to a fair extent.
    * en un grado sumo = in the extreme.
    * escala que consta de nueve grados = nine-point scale.
    * girar 180 grados = move + 180 degrees.
    * grado centígrado (ºC) = degree centigrade (ºC).
    * grado de aceptación = acceptance rate.
    * grado de acidez = pH, ph value.
    * grado de adecuación = degree of fit.
    * grado de citación = citedness.
    * grado de cobertura = depth of coverage.
    * grado de coincidencia entre el tema de un documento y el tema de búsqueda = topicality.
    * grado de compleción = completeness.
    * grado de escepticismo = degree of skepticism.
    * grado de integración = scale of integration.
    * grado de no citación = uncitedness.
    * grado de pertinencia = recall tendency.
    * grado de precisión = degree of detail.
    * grado de proximidad entre dos = betweenness.
    * grado de relación = relatedness measure.
    * grado medio = middle grade.
    * grado superlativo = superlative.
    * hasta tal grado que = so much so that.
    * salón de grados = conference room.
    * tomarse Algo de buen grado = take + Nombre + in good humour.
    * un cierto grado de = a certain amount of, a modicum of.
    * vida + dar un giro de 180 grados = turn + Posesivo + life around.

    * * *
    A
    1 (nivel, cantidad) degree
    otro ejemplo del grado de confusión reinante another example of the degree of confusion that prevails
    depende del grado de libertad que tengan it depends on how much freedom o the degree of freedom they enjoy
    el asunto se ha complicado en or ( AmL) a tal grado que no le veo solución things have become so complicated that I can't see any solution
    en grado sumo: la noticia me preocupó en grado sumo the news worried me greatly o caused me great concern
    nos complace en grado sumo poder comunicarle que … it gives us great pleasure to be able to inform you that …
    son primos en segundo grado they are second cousins
    un oficial de grado superior a high-ranking officer
    medio1 (↑ medio (1))
    C
    (disposición): de buen grado readily, willingly, with good grace
    de mal grado reluctantly, unwillingly, with bad grace
    D
    estamos a tres grados bajo cero it's three degrees below zero, it's minus three degrees
    2 ( Geog, Mat) degree
    a un ángulo de 60 grados at an angle of 60 degrees, at a 60° angle
    25 grados de latitud/longitud 25 degrees latitude/longitude
    3 ( Vin) degree
    un vino de 12 grados a 12% proof wine
    Compuestos:
    ● grado centígrado or Celsius
    degree centigrade o Celsius
    degree Fahrenheit
    E
    1 ( esp AmL) ( Educ) (curso, año) year, grade ( AmE), form ( BrE)
    2
    (título): tiene el grado de licenciado he has a college degree ( AmE), he has a university degree ( BrE)
    F ( Ling) degree
    grado positivo/comparativo positive/comparative degree
    G ( Der) stage
    el juicio se halla en grado de apelación/revisión the trial is at the appeal/review stage
    * * *

     

    grado sustantivo masculino
    1 ( en general) degree;

    grado centígrado or Celsius/Fahrenheit degree centigrade o Celsius/Fahrenheit;
    el grado de confusión reinante the degree of confusion that prevails;
    en grado sumo extremely
    2 ( de escalafón) grade;
    (Mil) rank
    3 ( disposición):
    ◊ de buen/mal grado willingly/unwillingly

    4
    a) (esp AmL) (Educ) (curso, año) year

    b) ( título):

    ◊ tiene el grado de licenciado he has a college (AmE) o (BrE) university degree

    grado sustantivo masculino
    1 degree
    2 Mil rank
    3 (gusto, voluntad) desire, will
    ♦ Locuciones: de buen/mal grado, willingly/reluctantly
    ' grado' also found in these entries:
    Spanish:
    categoría
    - coeficiente
    - colmo
    - ecuación
    - insolación
    - jerarquía
    - mayor
    - medida
    - menor
    - menos
    - mínimamente
    - poder
    - punto
    - superior
    - décima
    - enfadado
    - enfadar
    - enojado
    - enojar
    - extensión
    - grande
    English:
    accurately
    - degree
    - extent
    - extreme
    - first-degree
    - grace
    - grade
    - grind
    - insofar
    - may
    - optimum
    - point
    - rank
    - registrar
    - subaltern
    - commission
    - freely
    - lesser
    * * *
    grado nm
    1. [de temperatura] degree
    grado Celsius degree Celsius;
    grado centígrado degree centigrade;
    grado Fahrenheit degree Fahrenheit;
    grado Kelvin kelvin
    2. [de alcohol]
    ¿cuántos grados tiene ese whisky? how strong is that whisky?;
    alcohol de 90 grados 90 degree proof alcohol
    3. [índice, nivel] degree;
    el candidato mostró un alto grado de preparación the candidate was very well prepared;
    un fenómeno que afecta en menor grado a las ciudades a phenomenon that affects cities to a lesser extent o degree;
    eso depende del grado de intransigencia de la gente that depends on how prepared people are to compromise;
    están examinando su grado de ceguera they're checking to see how blind she is;
    la situación empeoró en tal o Am [m5]a tal grado que… the situation deteriorated to such a degree o to such an extent that…;
    en grado sumo greatly
    4. [en escala] degree;
    quemaduras de primer grado first-degree burns;
    asesinato en segundo grado second-degree murder
    5. [rango] grade;
    es primo mío en segundo grado he's my second cousin
    6. Mil rank
    7. Educ [año] year, class, US grade
    8. Educ [título] degree;
    obtuvo el grado de doctor he obtained his doctorate
    9. Ling degree
    grado comparativo comparative degree;
    grado superlativo superlative degree
    10. Mat [de ángulo] degree
    11. Mat [de ecuación]
    una ecuación de segundo grado a quadratic equation
    12. [voluntad]
    hacer algo de buen/mal grado to do sth willingly/unwillingly;
    te lo prestaré de buen grado I'd be happy to lend it to you
    * * *
    m
    1 degree;
    2
    :
    de buen grado with good grace, readily;
    de mal grado with bad grace, reluctantly
    * * *
    grado nm
    1) : degree (in meteorology and mathematics)
    grado centígrado: degree centigrade
    2) : extent, level, degree
    en grado sumo: greatly, to the highest degree
    3) rango: rank
    4) : year, class (in education)
    5)
    de buen grado : willingly, readily
    * * *
    grado n degree

    Spanish-English dictionary > grado

  • 3 измерение

    determination, dimension, measuring operation, gaging, measure, measurement, measuring, mensuration, test, sense, sensing
    * * *
    измере́ние с.
    1. (нахождение численного значения величины посредством сравнения с единицей меры) measurement
    подтвержда́ть измере́ниями (напр. теоретические выкладки) — verify by measurement(s) (e. g., theoretical computation)
    производи́ть измере́ние — make [take] a measurement
    2. ( определение) determination
    3. (проверка параметров, испытаний и т. п.) test
    4. ( функций) degree
    одноро́дная фу́нкция n-го измере́ния — a function is homogeneous of degree n
    измере́ние относи́тельно … — degree in …
    пе́рвого измере́ния относи́тельно … — of the first degree in …
    5. (в сочетаниях типа «в одном, двух, трёх измерениях») dimension
    в трёх измере́ниях — in three dimensions, three-dimensional
    абсолю́тное измере́ние — absolute measurement
    измере́ние ба́зиса геод. — base measurement, base-line surveying
    измере́ние вре́мени — chronometry, time-keeping
    измере́ние в свобо́дном полё́те — free-flight measurement
    вы́равненные измере́ния — adjusted measurements
    измере́ние высо́т — level(l)ing, altimetric [height] measurement, altimetry
    измере́ние глубины́ воды́ — depth-finding, sounding
    производи́ть измере́ния глубины́ воды́, напр. ло́том — take a sounding, e. g., by [with] a lead-line
    измере́ние глубины́ эхоло́том — depth-finding [sounding] by the acoustic echo method, echo sounding
    измере́ние да́льности — distance measurement; рлк. ranging
    дистанцио́нное измере́ние — remote measurement
    измере́ние замеще́нием — measurement by (the) substitution (method)
    инструмента́льное измере́ние — instrumental measurement
    ко́свенное измере́ние — indirect measurement
    измере́ние одноро́дной фу́нкции — degree
    относи́тельное измере́ние — relative measurement
    измере́ние по то́чкам — point-by-point measurement, point-by-point determination
    прямо́е измере́ние — direct measurement

    Русско-английский политехнический словарь > измерение

  • 4 Drake, Edwin Laurentine

    [br]
    b. 29 March 1819 Greenville, New York, USA
    d. 8 November 1880 Bethlehem, Pennsylvania, USA
    [br]
    American pioneer oil driller.
    [br]
    He worked on his father's farm, was a clerk in a hotel and a store, and then became an express agent at a railway company in Springfield, Massachusetts, c.1845. After he had been working as a railway conductor in New Haven, Connecticut, for eight years, he resigned because of ill health. Owning some stocks in a Pennsylvania rock-oil company, which gathered oil from ground-level seepages mainly for medicinal use, he was engaged by this company and moved to Titusville, Pennsylvania, at the age of almost 40. After studying salt-well drilling by cable tool, which was still percussive, he became enthusiastic about the idea of using the same method to drill for oil, especially after researches in chemistry had revealed this new sort of fossil energy some years before.
    As a manager of the Seneca Oil Company, which referred to him as "Colonel" in letters of introduction simply to impress people with such titles, Drake began drilling in 1858, almost at the same time as pole-tool drilling for oil was started in Germany. His main contribution to the technology was the use of an iron pipe driven through the quicksand and the bedrock to prevent the bore-hole from filling. After nineteen months he struck oil at a depth of 21 m (69 ft) in August 1859. This was the first time that petroleum was struck at its source and the first proof of the presence of oil reservoirs within the earth's surface. Drake inaugurated the search for and the exploitation of the deep oil resources of the world and he initiated the science of petroleum engineering which became established at the beginning of the twentieth century.
    Drake failed to patent his drilling method; he was content being an oil commission merchant and Justice of the Peace in Titusville, which like other places in Pennsylvania became a boom town. Four years later he went to New York, where he lost all his money in oil speculations. He became very ill again and lived in poverty in Vermont and New Jersey until 1873, when he moved to Bethlehem, Pennsylvania, where he was pensioned by the state of Pennsylvania. The city of Titusville erected a monument to him and founded the Drake Museum.
    [br]
    Further Reading
    Dictionary of American Biography, Vol. III, pp. 427–8.
    Ida M.Tarbell, 1904, "The birth of industry", History of the Standard Oil Company, Vol. I, New York (gives a lively description of the booming years in Pennsylvania caused by Drake's successful drilling).
    H.F.Williamson and A.R.Daum, 1959, The American Petroleum Industry. The Age of Illumination, Evans ton, Ill.
    WK

    Biographical history of technology > Drake, Edwin Laurentine

  • 5 Tull, Jethro

    [br]
    b. 30 March 1674 Basildon, Essex, England
    d. February 1741 Hungerford, Berkshire, England
    [br]
    English farmer who developed and publicized a system of row crop husbandry.
    [br]
    Jethro Tull was born into an English landowning family. He was educated at St John's College, Oxford, but left without a degree at the age of 17. He then spent three years on the Grand Tour before returning to study law at Gray's Inn in London. After six years he was admitted to the Bar, but he never practised, moving instead to one of his father's farms near Oxford.
    Because of labour problems he chose to plant sainfoin (Onobrychis viciaefolia) as a forage crop because it required less frequent reseeding than grass. The seed itself was expensive and of poor fertility, so he began to experiment. He discovered that the depth of sowing as well as the planting rate influenced germination and the rate of growth, he found the optimum rate could be gained with one plant per ft2, a much lower density than could be achieved by broadcasting. His experiments created labour problems. He is traditionally and incorrectly credited with the invention of the seed drill, but he did develop and use a drill on his own farm to achieve the planting rate and depth he needed without having to rely on his workforce.
    In 1711 Tull became ill and went to France, having first sold his original farm and moved to "Properous", near Hungerford. In France he developed a husbandry technique that used a horse hoe to stir the soil between the rows of plants achieved with his drill. He incorrectly believed that his increased yields were the result of nutrients released from the soil by this method, whereas they were more likely to have been the result of a reduction in weed competition as a result of the repeated cultivation.
    [br]
    Bibliography
    1731, The New Horse-Hoeing Husbandry, or an Essay on the Principals of Tillage and Vegetation (sets out the ideas and innovations for which he was already well known).
    Further Reading
    T.H.Marshall, 1929, "Jethro Tull and the new husbandry of the 18th century", Economic History Review 11:41–60 (the relevance and significance of Tull's work was already under discussion before his death; Marshall discusses the controversy).
    G.E.Fussell, 1973, Jethro Tull. His Influence on Mechanised Agriculture (presents a pro- Tull account).
    AP

    Biographical history of technology > Tull, Jethro

  • 6 Curr, John

    [br]
    b. 1756 Kyo, near Lanchester, or in Greenside, near Ryton-on-Tyne, Durham, England
    d. 27 January 1823 Sheffield, England
    [br]
    English coal-mine manager and engineer, inventor of flanged, cast-iron plate rails.
    [br]
    The son of a "coal viewer", Curr was brought up in the West Durham colliery district. In 1777 he went to the Duke of Norfolk's collieries at Sheffield, where in 1880 he was appointed Superintendent. There coal was conveyed underground in baskets on sledges: Curr replaced the wicker sledges with wheeled corves, i.e. small four-wheeled wooden wagons, running on "rail-roads" with cast-iron rails and hauled from the coal-face to the shaft bottom by horses. The rails employed hitherto had usually consisted of plates of iron, the flange being on the wheels of the wagon. Curr's new design involved flanges on the rails which guided the vehicles, the wheels of which were unflanged and could run on any hard surface. He appears to have left no precise record of the date that he did this, and surviving records have been interpreted as implying various dates between 1776 and 1787. In 1787 John Buddle paid tribute to the efficiency of the rails of Curr's type, which were first used for surface transport by Joseph Butler in 1788 at his iron furnace at Wingerworth near Chesterfield: their use was then promoted widely by Benjamin Outram, and they were adopted in many other English mines. They proved serviceable until the advent of locomotives demanded different rails.
    In 1788 Curr also developed a system for drawing a full corve up a mine shaft while lowering an empty one, with guides to separate them. At the surface the corves were automatically emptied by tipplers. Four years later he was awarded a patent for using double ropes for lifting heavier loads. As the weight of the rope itself became a considerable problem with the increasing depth of the shafts, Curr invented the flat hemp rope, patented in 1798, which consisted of several small round ropes stitched together and lapped upon itself in winding. It acted as a counterbalance and led to a reduction in the time and cost of hoisting: at the beginning of a run the loaded rope began to coil upon a small diameter, gradually increasing, while the unloaded rope began to coil off a large diameter, gradually decreasing.
    Curr's book The Coal Viewer (1797) is the earliest-known engineering work on railway track and it also contains the most elaborate description of a Newcomen pumping engine, at the highest state of its development. He became an acknowledged expert on construction of Newcomen-type atmospheric engines, and in 1792 he established a foundry to make parts for railways and engines.
    Because of the poor financial results of the Duke of Norfolk's collieries at the end of the century, Curr was dismissed in 1801 despite numerous inventions and improvements which he had introduced. After his dismissal, six more of his patents were concerned with rope-making: the one he gained in 1813 referred to the application of flat ropes to horse-gins and perpendicular drum-shafts of steam engines. Curr also introduced the use of inclined planes, where a descending train of full corves pulled up an empty one, and he was one of the pioneers employing fixed steam engines for hauling. He may have resided in France for some time before his death.
    [br]
    Bibliography
    1788. British patent no. 1,660 (guides in mine shafts).
    1789. An Account of tin Improved Method of Drawing Coals and Extracting Ores, etc., from Mines, Newcastle upon Tyne.
    1797. The Coal Viewer and Engine Builder's Practical Companion; reprinted with five plates and an introduction by Charles E.Lee, 1970, London: Frank Cass, and New York: Augustus M.Kelley.
    1798. British patent no. 2,270 (flat hemp ropes).
    Further Reading
    F.Bland, 1930–1, "John Curr, originator of iron tram roads", Transactions of the Newcomen Society 11:121–30.
    R.A.Mott, 1969, Tramroads of the eighteenth century and their originator: John Curr', Transactions of the Newcomen Society 42:1–23 (includes corrections to Fred Bland's earlier paper).
    Charles E.Lee, 1970, introduction to John Curr, The Coal Viewer and Engine Builder's Practical Companion, London: Frank Cass, pp. 1–4; orig. pub. 1797, Sheffield (contains the most comprehensive biographical information).
    R.Galloway, 1898, Annals of Coalmining, Vol. I, London; reprinted 1971, London (provides a detailed account of Curr's technological alterations).
    WK / PJGR

    Biographical history of technology > Curr, John

  • 7 Lucas, Anthony Francis

    [br]
    b. 9 September 1855 Spalato, Dalmatia, Austria-Hungary (now Split, Croatia)
    d. 2 September 1921 Washington, DC, USA
    [br]
    Austrian (naturalized American) mining engineer who successfully applied rotary drilling to oil extraction.
    [br]
    A former Second Lieutenant of the Austrian navy (hence his later nickname "Captain") and graduate of the Polytechnic Institute of Graz, Lucas decided to stay in Michigan when he visited his relatives in 1879. He changed his original name, Lucie, into the form his uncle had adopted and became a naturalized American citizen at the age of 30. He worked in the lumber industry for some years and then became a consulting mechanical and mining engineer in Washington, DC. He began working for a salt-mining company in Louisiana in 1893 and became interested in the geology of the Mexican Gulf region, with a view to prospecting for petroleum. In the course of this work he came to the conclusion that the hills in this elevated area, being geological structures distinct from the surrounding deposits, were natural reservoirs of petroleum. To prove his unusual theory he subsequently chose Spindle Top, near Beaumont, Texas, where in 1899 he began to bore a first oil-well. A second drill-hole, started in October 1900, was put through clay and quicksand. After many difficulties, a layer of rock containing marine shells was reached. When the "gusher" came out on 10 January 1901, it not only opened up a new era in the oil and gas business, but it also led to the future exploration of the terrestrial crust.
    Lucas's boring was a breakthrough for the rotary drilling system, which was still in its early days although its principles had been established by the English engineer Robert Beart in his patent of 1884. It proved to have advantages over the pile-driving of pipes. A pipe with a simple cutter at the lower end was driven with a constantly revolving motion, grinding down on the bottom of the well, thus gouging and chipping its way downward. To deal with the quicksand he adopted the use of large and heavy casings successively telescoped one into the other. According to Fauvelle's method, water was forced through the pipe by means of a pump, so the well was kept full of circulating liquid during drilling, flushing up the mud. When the salt-rock was reached, a diamond drill was used to test the depth and the character of the deposit.
    When the well blew out and flowed freely he developed a preventer in order to save the oil and, even more importantly at the time, to shut the well and to control the oil flow. This assembly, patented in 1903, consisted of a combined system of pipes, valves and casings diverting the stream into a horizontal direction.
    Lucas's fame spread around the world, but as he had to relinquish the larger part of his interest to the oil company supporting the exploration, his financial reward was poor. One year after his success at Spindle Top he started oil exploration in Mexico, where he stayed until 1905, when he resumed his consulting practice in Washington, DC.
    [br]
    Bibliography
    1899, "Rock-salt in Louisiana", Transactions of the American Institution of Mining Engineers 29:462–74.
    1902, "The great oil-well near Beaumont, Texas", Transactions of the American
    Institution of Mining Engineers 31:362–74.
    Further Reading
    R.S.McBeth, 1918, Pioneering the Gulf Coast, New York (a very detailed description of Lucas's important accomplishments in the development of the oil industry).
    R.T.Hill, 1903, "The Beaumont oil-field, with notes on other oil-fields of the Texas region", Transactions of the American Institution of Mining Engineers 33:363–405;
    Transactions of the American Institution of Mining Engineers 55:421–3 (contain shorter biographical notes).
    WK

    Biographical history of technology > Lucas, Anthony Francis

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