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Principles of Mechanics

  • 1 Hertz, Heinrich Rudolph

    [br]
    b. 22 February 1857 Hamburg, Germany
    d. 1 January 1894 Bonn, Germany
    [br]
    German physicist who was reputedly the first person to transmit and receive radio waves.
    [br]
    At the age of 17 Hertz entered the Gelehrtenschule of the Johaneums in Hamburg, but he left the following year to obtain practical experience for a year with a firm of engineers in Frankfurt am Main. He then spent six months at the Dresden Technical High School, followed by year of military service in Berlin. At this point he decided to switch from engineering to physics, and after a year in Munich he studied physics under Helmholtz at the University of Berlin, gaining his PhD with high honours in 1880. From 1883 to 1885 he was a privat-dozent at Kiel, during which time he studied the electromagnetic theory of James Clerk Maxwell. In 1885 he succeeded to the Chair in Physics at Karlsruhe Technical High School. There, in 1887, he constructed a rudimentary transmitter consisting of two 30 cm (12 in.) rods with metal balls separated by a 7.5 mm (0.3 in.) gap at the inner ends and metallic plates at the outer ends, the whole assembly being mounted at the focus of a large parabolic metal mirror and the two rods being connected to an induction coil. At the other side of his laboratory he placed a 70 cm (27½ in.) diameter wire loop with a similar air gap at the focus of a second metal mirror. When the induction coil was made to create a spark across the transmitter air gap, he found that a spark also occurred at the "receiver". By a series of experiments he was not only able to show that the invisible waves travelled in straight lines and were reflected by the parabolic mirrors, but also that the vibrations could be refracted like visible light and had a similar wavelength. By this first transmission and reception of radio waves he thus confirmed the theoretical predictions made by Maxwell some twenty years earlier. It was probably in his experiments with this apparatus in 1887 that Hertz also observed that the voltage at which a spark was able to jump a gap was significantly reduced by the presence of ultraviolet light. This so-called photoelectric effect was subsequently placed on a theoretical basis by Albert Einstein in 1905. In 1889 he became Professor of Physics at the University of Bonn, where he continued to investigate the nature of electric discharges in gases at low pressure until his death after a long and painful illness. In recognition of his measurement of radio and other waves, the international unit of frequency of an oscillatory wave, the cycle per second, is now universally known as the Hertz.
    [br]
    Principal Honours and Distinctions
    Royal Society Rumford Medal 1890.
    Bibliography
    Much of Hertz's work, including his 1890 paper "On the fundamental equations of electrodynamics for bodies at rest", is recorded in three collections of his papers which are available in English translations by D.E.Jones et al., namely Electric Waves (1893), Miscellaneous Papers (1896) and Principles of Mechanics (1899).
    Further Reading
    J.G.O'Hara and W.Pricha, 1987, Hertz and the Maxwellians, London: Peter Peregrinus. J.Hertz, 1977, Heinrich Hertz, Memoirs, Letters and Diaries, San Francisco: San Francisco Press.
    KF

    Biographical history of technology > Hertz, Heinrich Rudolph

  • 2 principio

    m.
    1 beginning, start (comienzo).
    el principio del fin the beginning of the end
    del principio al fin, desde el principio hasta el fin from beginning to end, from start to finish
    a principios de at the beginning of
    al principio at first, in the beginning
    en principio quedamos en hacer una reunión el jueves provisionally o unless you hear otherwise, we've arranged to meet on Thursday
    en un principio at first
    2 principle (fundamento, ley).
    en principio in principle
    por principio on principle
    3 origin, source (origen).
    4 element (elemento).
    principio activo active ingredient
    pres.indicat.
    1st person singular (yo) present indicative of spanish verb: principiar.
    * * *
    1 (inicio) beginning, start
    2 (base) principle
    3 (moral) principle
    1 rudiments
    \
    al principio at first, at the beginning
    en principio in principle
    * * *
    noun m.
    1) beginning, outset
    * * *
    SM
    1) (=comienzo) beginning

    al principio — at first, in the beginning

    a principios del verano — at the beginning of the summer, early in the summer

    desde el principio — from the first, from the outset

    desde el principio hasta el fin — from start to finish, from beginning to end

    en un principio — at first, to start with

    tener principio en algo — to start from sth, be based on sth

    2) pl principios (=nociones) rudiments, first notions

    "Principios de física" — "Introduction to Physics", "Outline of Physics"

    3) (=norma) principle

    el principio de la legalidad — the force of law, the rule of law

    4) (Fil) principle
    5) (Quím) element, constituent
    6) (Culin) entrée
    * * *
    1) ( comienzo) beginning

    el principio del verano — early summer, the beginning of summer

    en un or al principio — at first, in the beginning

    2)
    a) (concepto, postulado) principle
    b) ( norma moral) principle
    * * *
    1) ( comienzo) beginning

    el principio del verano — early summer, the beginning of summer

    en un or al principio — at first, in the beginning

    2)
    a) (concepto, postulado) principle
    b) ( norma moral) principle
    * * *
    el principio
    = early days, the

    Ex: The new chemical was expensive, and in the early days it was often mishandled; much of the foxing of early nineteenth-century paper was due to inefficient bleaching.

    principio1
    1 = principle, proposition, tenet, canon, touchstone.

    Ex: Objective 2 results in what could be described as a collocative catalogue, because a catalogue based on this principle collocates the writings of a particular author.

    Ex: They are a core, a set of basic propositions, onto which are grafted a rich variety of other possibilities.
    Ex: This attack summarises her main tenets.
    Ex: The archetypal canon is of course that of the books of the Bible, which are gathered together in a fixed and unchanging order.
    Ex: The touchstone for professional practice are the professional codes of ethics that govern medicine in face-to-face relationships with patients.
    * actuar de acuerdo con los principios de Uno = act on + Posesivo + principles.
    * adherirse a principios = espouse + principles.
    * basado en principios = principled.
    * basarse en un principio = base on + principle.
    * con principios = principled.
    * cumplir con un principio = comport with + principle.
    * declaración de principios = statement of principles, value statement, Bill of Rights, declaration of principles, statement of principles.
    * defender los principios de Uno = stand up for + Posesivo + principles.
    * de principios = principled.
    * de principios muy elevados = high-minded.
    * en principio = in principle, on principle.
    * establecer un principio = establish + principle, set forth + cause.
    * formular un principio = formulate + principle.
    * infringir un principio = violate + principle.
    * ir en contra de todos + Posesivo + principios = violate + principle.
    * Los Principios de París = Paris Principles.
    * mantenerse fiel a los principios de Uno = stick to + Posesivo + principles.
    * poner en duda unos principios = shake + foundations.
    * por principio = on principle.
    * por principios = as a matter of principle.
    * principio constitutivo = constitutive principle.
    * principio de actuación = governing principle.
    * principio de archívese según aparece = file-as-is principle.
    * principio de cualificación profesional adecuada para el trabajo en cuestión = principle of rate for the job.
    * principio de gratuidad, el = gratis principle, the.
    * principio de igualdad, el = egalitarian principle, the.
    * principio de la alfabetización literal = file-as-is principle, file-as-is principle.
    * principio del escalonamiento = scalar principle.
    * principio ético = moral principle.
    * principio fundamental = fundamental, principium [principia, -pl.].
    * principio moral = moral principle.
    * principio orientador = guiding principle.
    * principios = philosophy, ethos, morals.
    * principios elevados = high-mindedness.
    * Principios para la Intercalación Bibliográfica = ISO7154.
    * proponer como principio = posit.
    * respetar los principios = observe + principles.
    * seguir un principio = adopt + convention.
    * sin principios = unscrupulous, unprincipled.
    * suscribir un principio = subscribe to + principle.
    * traicionar los principios de uno mismo = betray + Posesivo + own principles.
    * una cuestión de principios = a matter of principle.
    * violar un principio = violate + principle.

    principio2
    2 = start, eruption, kick-off, startup [start-up], beginning.

    Ex: Olle is right, however, in implying that after a slow start interest in, and writing about, official publishing in Britain has increased dramatically in recent years.

    Ex: Information on the news items relevant to 'mad cow disease' was collected for a period of 100 days starting very close to the eruption of the crisis.
    Ex: The cooperative venture 'StoryLines America' joins libraries and public radio in smash kick-off.
    Ex: This article presents some practical tips to help users of DIALOG's DIALOGLINK including buffer size, screen speed-up, startup short cuts, type-ahead buffer and use of DIALOGLING with other services.
    Ex: In addition, synthesis often requires the use of a facet indicator, which marks the beginning of a new facet for example.
    * abocado al fracaso desde el principio = doomed from + the start, doomed from + the outset, doomed to + failure, doomed to + failure from its inception, doomed from + the beginning.
    * al principio = at first, at the outset, early [earlier -comp., earliest -sup.], in the early years, originally, to start with, early on, at startup.
    * al principio de = at the beginning (of), at the dawn of, at the onset of, early in.
    * al principio de la imprenta = early printing.
    * al principio y al final = both ends.
    * al principio y al final de = at each end of.
    * a principios de = in the early + Fecha.
    * a principios de + Expresión Temporal = early + Expresión Temporal, the.
    * a principios de los + Década = early + Década, the.
    * comenzar por el principio = start from + scratch, start at + ground zero.
    * comenzar por el principio, empezar desde cero, comen = start from + scratch.
    * condenado al fracaso desde el principio = doomed from + the start, doomed from + the outset, doomed from + the beginning.
    * de finales del siglo XIX y principios del XX = turn-of-the-century.
    * de principio a fin = from start to finish, gavel to gavel, from beginning to end.
    * de principio a fin (documento) = cover to cover.
    * desde el principio = from the start, all along, ab initio, from the outset, from the beginning, from the word go, from the word get-go.
    * desde el principio de los tiempos = since the beginning of time, from the beginning of time, since time began.
    * desde principio a fin = throughout.
    * desde principios de siglo = since the turn of the century, from the turn of the century.
    * el principio de = the dawn of.
    * el principio del fin = the beginning of the end.
    * el principio de + Mes/Estación = early + Mes/Estación.
    * empezar por el principio = start from + scratch, start at + ground zero.
    * en principio = at first, conceivably, first of all, prima facie.
    * en un principio = at an earlier stage, initially, originally, at one time, to begin with.
    * fracaso desde el principio = doomed failure.
    * hay que empezar por el principio = first things must come first.
    * leer de principio a fin = read + from cover to cover.
    * muy al principio = in very early days, at the very outset.
    * para principios de siglo = by the turn of the century.
    * principio, el = early days, the.
    * regresar al principio = go back to + square one, be back to square one.
    * volvemos siempre al principio = things swing full circle.
    * volver al principio = come + full circle, bring + Pronombre + full-circle.

    * * *
    A (comienzo) beginning
    el principio del verano early summer, the beginning of summer
    empieza por el principio start at the beginning
    el principio del fin the beginning of the end
    el éxito logrado con su primer libro es un buen principio the success she's had with her first book is a good start, the success of her first book has got her off to a good start
    se llegó a un principio de acuerdo en las negociaciones they reached the beginnings of an agreement in the negotiations
    congeniamos desde el principio we got along well from the start
    leyó el libro desde el principio hasta el final sin parar he read the book from cover to cover o from beginning to end o from start to finish without putting it down
    a principios de temporada at the beginning of the season
    a principios de siglo at the turn of the century
    al principio at first
    en un principio se creyó que la Tierra era plana at first o in the beginning people believed the Earth was flat
    B
    1 (concepto, postulado) principle
    es un principio universalmente aceptado it's a universally accepted concept
    la teoría parte de un principio erróneo the theory is based on a false premise
    en principio la reunión es el jueves the meeting's on Thursday unless you hear otherwise o provisionally, the meeting is set for Thursday
    en principio estoy de acuerdo, pero no depende sólo de mí I agree in principle, but it isn't only up to me
    2 (norma moral) principle
    es una cuestión de principios it's a question of principle(s)
    es una persona de principios she's a person of principle o a principled person
    por principio on principle
    Compuestos:
    uncertainty principle
    uncertainty principle
    ● principio de placer/realidad
    pleasure/reality principle
    * * *

     

    Del verbo principiar: ( conjugate principiar)

    principio es:

    1ª persona singular (yo) presente indicativo

    principió es:

    3ª persona singular (él/ella/usted) pretérito indicativo

    Multiple Entries:
    principiar    
    principio
    principio sustantivo masculino
    1 ( comienzo) beginning;

    empieza por el principio start at the beginning;
    eso es un buen principio that's a good start;
    en un or al principio at first, in the beginning
    2 (postulado, norma moral) principle;

    por principio on principle
    principio sustantivo masculino
    1 (comienzo) beginning, start: nos hemos perdido el principio de la película, we've missed the beginning of the film
    2 (causa, origen) premise, origin
    3 (idea fundamental, norma) principle 4 principios, (nociones) rudiments, basics: posee algunos principios de mecánica, she has some rudiments of mechanics
    ♦ Locuciones: al principio, at first
    en principio, in principle
    por principio, on principle
    ' principio' also found in these entries:
    Spanish:
    A
    - cien
    - empezar
    - extrema
    - extremo
    - frustrarse
    - germen
    - horterada
    - indirecta
    - vista
    - criterio
    - elemental
    - por
    English:
    at
    - basically
    - begin
    - beginning
    - cornerstone
    - early
    - farce
    - first
    - front
    - further
    - go
    - hear of
    - initially
    - initiation
    - listen
    - maybe
    - originally
    - outset
    - policy
    - principle
    - see
    - soon
    - start
    - stick to
    - tenet
    - wind back
    - from
    - out
    - right
    - throughout
    - turn
    * * *
    1. [comienzo] beginning, start;
    empieza por el principio start at the beginning;
    al principio at first, in the beginning;
    desde el principio from the beginning;
    se ha llegado a un principio de acuerdo a preliminary agreement has been reached;
    a principios de at the beginning of;
    en un principio at first;
    el principio del fin the beginning of the end;
    del principio al fin, desde el principio hasta el fin from beginning to end, from start to finish
    2. [fundamento, ley] principle
    principio de Arquímedes Archimedes' principle; Filosofía principio de causalidad causality principle;
    principio de incertidumbre uncertainty principle;
    principio de indeterminación uncertainty principle;
    principio del todo o nada all-or-nothing policy
    3. [origen] origin, source
    4. [elemento] element
    principio activo active ingredient
    5.
    principios [reglas de conducta] principles;
    un hombre de principios a man of principles;
    sin principios unprincipled, unscrupulous;
    por principio on principle;
    se negó a hacerlo por principios she refused to do it on principle
    6.
    principios [nociones] rudiments, first principles;
    tiene algunos principios de informática she knows a bit about computing
    7. [primera consideración]
    en principio: en principio, me parece buena la idea in principle, the idea seems good;
    en principio quedamos en hacer una reunión el jueves provisionally o unless you hear otherwise, we've arranged to meet on Thursday
    * * *
    m
    1 ley, moral principle;
    en principio in principle;
    por principio on principle
    2 en tiempo beginning;
    a principios de abril at the beginning of April;
    al principio, en un principio at first;
    el principio del fin the beginning of the end
    * * *
    1) comienzo: beginning
    2) : principle
    3)
    al principio : at first
    4)
    a principios de : at the beginning of
    a principios de agosto: at the beginning of August
    5)
    en principio : in principle
    * * *
    1. (comienzo) beginning
    2. (concepto) principle
    a principios de... at the beginning of...

    Spanish-English dictionary > principio

  • 3 Banu Musa ibn Shakir

    [br]
    fl. c.850
    [br]
    Arab astronomers and engineers.
    [br]
    The Banu were the three sons of Musa ibn Shakir. His origins were unpromising, for he was a robber, but the caliph al-Ma'mun, a great patron of science and learning, took the sons into his academy and had them educated. The eldest and most prominent, Muhammed, took up the study of geometry, logic and astronomy, while another, al- Hasan, also studied geometry. The third, Ahmad, turned to mechanics. Together, the Banu established a group for the translation of texts from antiquity, especially Greece, on science and mechanics. They were responsible for compiling the Kitab al-Hiyal (Book of Ingenious Devices), the first of two major works on mechanics that appeared in the medieval Islamic world. The authors drew freely from earlier Greek writers, particularly Hero and Philon. The work is a technical manual for making devices such as lamps, pipes in spring wells and drinking vessels, most depending on differences in air pressure generated by the movement of liquids. These principles were applied to make a self-filling oil lamp. The work also demonstrated the lifting of heavy weights by means of pulleys. In another work, the Qarastun (Book of the Balance), the Banu showed how different weights could be balanced by varying the distance from the fulcrum.
    [br]
    Further Reading
    Dictionary of Scientific Biography.
    LRD

    Biographical history of technology > Banu Musa ibn Shakir

  • 4 Cayley, Sir George

    SUBJECT AREA: Aerospace
    [br]
    b. 27 December 1773 Scarborough, England
    d. 15 December 1857 Brompton Hall, Yorkshire, England
    [br]
    English pioneer who laid down the basic principles of the aeroplane in 1799 and built a manned glider in 1853.
    [br]
    Cayley was born into a well-to-do Yorkshire family living at Brompton Hall. He was encouraged to study mathematics, navigation and mechanics, particularly by his mother. In 1792 he succeeded to the baronetcy and took over the daunting task of revitalizing the run-down family estate.
    The first aeronautical device made by Cayley was a copy of the toy helicopter invented by the Frenchmen Launoy and Bienvenu in 1784. Cayley's version, made in 1796, convinced him that a machine could "rise in the air by mechanical means", as he later wrote. He studied the aerodynamics of flight and broke away from the unsuccessful ornithopters of his predecessors. In 1799 he scratched two sketches on a silver disc: one side of the disc showed the aerodynamic force on a wing resolved into lift and drag, and on the other side he illustrated his idea for a fixed-wing aeroplane; this disc is preserved in the Science Museum in London. In 1804 he tested a small wing on the end of a whirling arm to measure its lifting power. This led to the world's first model glider, which consisted of a simple kite (the wing) mounted on a pole with an adjustable cruciform tail. A full-size glider followed in 1809 and this flew successfully unmanned. By 1809 Cayley had also investigated the lifting properties of cambered wings and produced a low-drag aerofoil section. His aim was to produce a powered aeroplane, but no suitable engines were available. Steam-engines were too heavy, but he experimented with a gunpowder motor and invented the hot-air engine in 1807. He published details of some of his aeronautical researches in 1809–10 and in 1816 he wrote a paper on airships. Then for a period of some twenty-five years he was so busy with other activities that he largely neglected his aeronautical researches. It was not until 1843, at the age of 70, that he really had time to pursue his quest for flight. The Mechanics' Magazine of 8 April 1843 published drawings of "Sir George Cayley's Aerial Carriage", which consisted of a helicopter design with four circular lifting rotors—which could be adjusted to become wings—and two pusher propellers. In 1849 he built a full-size triplane glider which lifted a boy off the ground for a brief hop. Then in 1852 he proposed a monoplane glider which could be launched from a balloon. Late in 1853 Cayley built his "new flyer", another monoplane glider, which carried his coachman as a reluctant passenger across a dale at Brompton, Cayley became involved in public affairs and was MP for Scarborough in 1832. He also took a leading part in local scientific activities and was co-founder of the British Association for the Advancement of Science in 1831 and of the Regent Street Polytechnic Institution in 1838.
    [br]
    Bibliography
    Cayley wrote a number of articles and papers, the most significant being "On aerial navigation", Nicholson's Journal of Natural Philosophy (November 1809—March 1810) (published in three numbers); and two further papers with the same title in Philosophical Magazine (1816 and 1817) (both describe semi-rigid airships).
    Further Reading
    L.Pritchard, 1961, Sir George Cayley, London (the standard work on the life of Cayley).
    C.H.Gibbs-Smith, 1962, Sir George Cayley's Aeronautics 1796–1855, London (covers his aeronautical achievements in more detail).
    —1974, "Sir George Cayley, father of aerial navigation (1773–1857)", Aeronautical Journal (Royal Aeronautical Society) (April) (an updating paper).
    JDS

    Biographical history of technology > Cayley, Sir George

  • 5 Hero of Alexandria

    [br]
    fl. c.62 AD Alexandria
    [br]
    Alexandrian mathematician and mechanician.
    [br]
    Nothing is known of Hero, or Heron, apart from what can be gleaned from the books he wrote. Their scope and style suggest that he was a teacher at the museum or the university of Alexandria, writing textbooks for his students. The longest book, and the one with the greatest technological interest, is Pneumatics. Some of its material is derived from the works of the earlier writers Ctesibius of Alexandria and Philo of Byzantium, but many of the devices described were invented by Hero himself. The introduction recognizes that the air is a body and demonstrates the effects of air pressure, as when air must be allowed to escape from a closed vessel before water can enter. There follow clear descriptions of a variety of mechanical contrivances depending on the effects of either air pressure or heated gases. Most of the devices seem trivial, but such toys or gadgets were popular at the time and Hero is concerned to show how they work. Inventions with a more serious purpose are a fire pump and a water organ. One celebrated gadget is a sphere that is set spinning by jets of steam—an early illustration of the reaction principle on which modern jet propulsion depends.
    M echanics, known only in an Arabic version, is a textbook expounding the theory and practical skills required by the architect. It deals with a variety of questions of mechanics, such as the statics of a horizontal beam resting on vertical posts, the theory of the centre of gravity and equilibrium, largely derived from Archimedes, and the five ways of applying a relatively small force to exert a much larger one: the lever, winch, pulley, wedge and screw. Practical devices described include sledges for transporting heavy loads, cranes and a screw cutter.
    Hero's Dioptra describes instruments used in surveying, together with an odometer or device to indicate the distance travelled by a wheeled vehicle. Catoptrics, known only in Latin, deals with the principles of mirrors, plane and curved, enunciating that the angle of incidence is equal to that of reflection. Automata describes two forms of puppet theatre, operated by strings and drums driven by a falling lead weight attached to a rope wound round an axle. Hero's mathematical work lies in the tradition of practical mathematics stretching from the Babylonians through Islam to Renaissance Europe. It is seen most clearly in his Metrica, a treatise on mensuration.
    Of all his works, Pneumatics was the best known and most influential. It was one of the works of Greek science and technology assimilated by the Arabs, notably Banu Musa ibn Shakir, and was transmitted to medieval Western Europe.
    [br]
    Bibliography
    All Hero's works have been printed with a German translation in Heronis Alexandrini opera quae supersunt omnia, 1899–1914, 5 vols, Leipzig. The book on pneumatics has been published as The Pneumatics of Hero of Alexandria, 1851, trans. and ed. Bennet Wood-croft, London (facs. repr. 1971, introd. Marie Boas Hall, London and New York).
    Further Reading
    A.G.Drachmann, 1948, "Ktesibios, Philon and Heron: A Study in Ancient Pneumatics", Acta Hist. Sci. Nat. Med. 4, Copenhagen: Munksgaard.
    T.L.Heath, 1921, A History of Greek Mathematics, Oxford (still useful for his mathematical work).
    LRD

    Biographical history of technology > Hero of Alexandria

  • 6 Rateau, Auguste Camille-Edmond

    [br]
    b. 13 October 1863 Royan, France
    d. 13 January 1930 Neuilly-sur-Seine, France
    [br]
    French constructor of turbines, inventor of the turbo compressor and a centrifugal fan for mine ventilation.
    [br]
    A don of the Ecole Polytechnique and the Ecole Supérieure des Mines in Paris, Rateau joined the French Corps des Mines in 1887. Between 1888 and 1898 he taught applied mechanics and electro technics at the Ecole des Mines in St-Etienne. Trying to apply the results of his research to practise, he became into contact with commercial firms, before he was appointed Professor of Industrial Electricity at the Ecole Supérieure des Mines in Paris in 1902. He held this position until 1910, although he founded the Société Anonyme Rateau in Paris in 1903 which by the time of his death had subsidiaries in most of the industrial centres of Europe. By the middle of the nineteenth century, when the increasing problems of ventilation in coal mines had become evident and in many countries had led to several unsatisfactory mechanical constructions, Rateau concentrated on this problem soon after he began working in St-Etienne. The result of his research was the design of a centrifugal fan in 1887 with which he established the principles of mechanical ventilation on a general basis that led to future developments and helped, together with the ventilator invented by Capell in England, to pave the way for the use of electricity in mine ventilation.
    Rateau continued the study of fluid mechanics and the applications of rotating engines, and after he had published widely on this subject he began to construct many steam turbines, centrifugal compressors and centrifugal pumps. The multicellular Rateau turbine of 1901 became the prototype for many others constructors. During the First World War, when he was very active in the French armaments industry, he developed the invention of the automatic supercharger for aircraft engines and later diesel engines.
    [br]
    Principal Honours and Distinctions
    Académie des Sciences, Prix Fourneyron 1899, Prix Poncelet 1911, Member 1918.
    Bibliography
    1892, Considérations sur les turbo-machines et en particulier sur les ventilateurs, St- Etienne.
    Further Reading
    H.H.Suplee, 1930, obituary, Mechanical Engineering 52:570–1.
    L.Leprince-Ringuet (ed.), 1951, Les inventeurs célèbres, Geneva: 151–2 (a comprehensive description of his life and the importance of his turbines).
    WK

    Biographical history of technology > Rateau, Auguste Camille-Edmond

  • 7 воспользоваться

    •

    In order to explain..., one must draw on the principles of quantum mechanics.

    •

    The designer must fall back on semiempirical numerical methods of analysis.

    •

    Pascal invoked the principle of indifference by referring to a coin flip in his famous wager.

    •

    Recourse was made (or We resorted) to a propulsion unit incorporating...

    •

    To take advantage of the higher potential,…

    * * *
    Воспользоваться -- to make use of, to avail oneself of, to take advantage of, to make resort to, to use to advantage; to resort to, to exploit; to capitalize (с выгодой); to enlist (заручиться содействием); to invoke, to enter (рисунком, таблицей)
     In determining the extent of the hysteresis, we again make use of the concept of a critical blockage.
     In order for you to avail yourself of this reliable method of journal copy transmittal it would be prudent for you to ask Mr. X. to continue the same arrangements as his predecessor.
     The resulting system was unable to take advantage of all available trends due to the in-house limitations of some system subcontractors.
     Because stress levels in the bearing lining have never been easily calculated, resort has been made instead to specific load as a design parameter.
     This directionality of properties can be used to advantage and must be considered in component design.
     This phenomenon could possibly be exploited to reduce design mass.
     First a search program is invoked which, based on these assumptions, locates the liquid-liquid interfaces.
     We may now enter Fig. to determine the crack growth rates.

    Русско-английский научно-технический словарь переводчика > воспользоваться

  • 8 воспользоваться

    •

    In order to explain..., one must draw on the principles of quantum mechanics.

    •

    The designer must fall back on semiempirical numerical methods of analysis.

    •

    Pascal invoked the principle of indifference by referring to a coin flip in his famous wager.

    •

    Recourse was made (or We resorted) to a propulsion unit incorporating...

    •

    To take advantage of the higher potential,…

    Русско-английский научно-технический словарь переводчика > воспользоваться

  • 9 описывать

    •

    We have covered this event in Chap. 12.

    •

    The purpose of this chapter is to give an account of the movement of energy in the astronomical world.

    II
    •

    This equation governs the flow under such conditions.

    •

    This enabled the Newtonian mechanics to represent (or describe) planetary motions to a high degree of approximation.

    •

    This paper is concerned with experimental control systems.

    •

    The book covers (or describes) the principles of soldering.

    •

    The article deals with (or outlines) the modifications at the power station.

    •

    The article presents (or describes) a method...

    •

    The point on the flywheel traces (or describes) a circle with a circumference 2π.

    Русско-английский научно-технический словарь переводчика > описывать

  • 10 рассматривать

    •

    We shall cover these compounds in the next chapter.

    •

    Here we examine the combined effect of...

    •

    We shall deal with this subject in the next chapter.

    •

    To fully appreciate the significance of these data, each aspect of the genetical processes must first be scrutinized.

    •

    We have considered this problem carefully.

    •

    Mechanics treats of the action of forces and their effect.

    •

    Since subtraction is the same process as addition, subtraction is not treated separately here.

    •

    We will now look at the basic principles used in fluid logic.

    •

    Let us take a look at the individual components of...

    •

    The effect of these differences on... will be covered later.

    •

    At the moment enzyme catalysis forms a separate subject; we shall not take it up here.

    •

    The durability of the material must be viewed from two standpoints - the mechanical and the electrical.

    II
    •

    When an object is viewed with both eyes, it looks like...

    •

    This series can be considered a result of the substitution of...

    •

    Then luminiferous ether could be viewed as an exceedingly subtle gas.

    Русско-английский научно-технический словарь переводчика > рассматривать

  • 11 внедрение

    1) General subject: implantation, implantation (идей, взглядов и т.п.), inoculation (мыслей, идей), invagination, promotion, implementation, introduction, plantation, entrenchment (Например, entrenchment of a culture - внедрение культуры), implementing, implant
    2) Computers: deployment
    3) Geology: extrusion, inbreaking, injection, intrusion (напр. соли, изверженного материала), invasion, punching in, thrusting, transverse thrust
    5) Medicine: adventitia, inoculation (мыслей, идей и т.п.), insertion, interposition, permeation, infiltration (into... - в... ; англ. термин взят из статьи: Edbrook C.D. Principles of deep cover // Studies in Intelligence. - Vol. 5. - Issue: Summer. - CIA, 1961. - pp. 1 - 29 (declassified in 1995).)
    7) Mathematics: application
    11) Psychology: inoculation (мыслей, идей, чувств и т. п.)
    12) Information technology: embedding (OLE), penetration (проникновение)
    13) Oil: advance
    14) Mechanics: indention
    15) Ecology: immigration
    16) Advertising: penetration (например, на рынок)
    17) Patents: coupling, realization
    18) Business: baptism
    20) Polymers: indentation
    23) Psychoanalysis: inoculation (мыслей, идей, чувств и т.п.)
    24) Makarov: Insertion (реакция присоединения фрагмента к двум атомам, связанным сигма-связью), adaptation (новой техники и т.п.), adaption (новой техники и т.п.), adoption (принятие к повседневной практике), adoption (for everyday use) (новых правил техники безопасности в практику), assimilation (заимствование из др. областей), commercialization (на рентабельном уровне), corporation, development, emplacement, encroachment, imbedding, implementation (нового метода), implementation (реализация, разработка), incorporation (включение, объединение, встраивание), inculcate (идеи и т.п.), inculcation, indentation (вдавливание), integration (в существующую практику производства), introduction (введение), introduction (нового вида), introduction (нового вида, сорта или породы), introduction (нового метода), introduction (передовых методов производства, нового оборудования), intrusion (вида, особи в фитоценоз), intussusception (одной ткани в другую или новых слое между старыми), invasion (в фитоценоз), irruption, penetrating, penetration (вдавливание, проникание), reduction (в практику)
    25) SAP.tech. implem., implement., rollout

    Универсальный русско-английский словарь > внедрение

  • 12 принципы конструирования

    1) Economy: design philosophy
    2) Mechanics: construction rules
    3) Combustion gas turbines: principles of design

    Универсальный русско-английский словарь > принципы конструирования

  • 13 Elder, John

    [br]
    b. 9 March 1824 Glasgow, Scotland
    d. 17 September 1869 London, England
    [br]
    Scottish engineer who introduced the compound steam engine to ships and established an important shipbuilding company in Glasgow.
    [br]
    John was the third son of David Elder. The father came from a family of millwrights and moved to Glasgow where he worked for the well-known shipbuilding firm of Napier's and was involved with improving marine engines. John was educated at Glasgow High School and then for a while at the Department of Civil Engineering at Glasgow University, where he showed great aptitude for mathematics and drawing. He spent five years as an apprentice under Robert Napier followed by two short periods of activity as a pattern-maker first and then a draughtsman in England. He returned to Scotland in 1849 to become Chief Draughtsman to Napier, but in 1852 he left to become a partner with the Glasgow general engineering company of Randolph Elliott \& Co. Shortly after his induction (at the age of 28), the engineering firm was renamed Randolph Elder \& Co.; in 1868, when the partnership expired, it became known as John Elder \& Co. From the outset Elder, with his partner, Charles Randolph, approached mechanical (especially heat) engineering in a rigorous manner. Their knowledge and understanding of entropy ensured that engine design was not a hit-and-miss affair, but one governed by recognition of the importance of the new kinetic theory of heat and with it a proper understanding of thermodynamic principles, and by systematic development. In this Elder was joined by W.J.M. Rankine, Professor of Civil Engineering and Mechanics at Glasgow University, who helped him develop the compound marine engine. Elder and Randolph built up a series of patents, which guaranteed their company's commercial success and enabled them for a while to be the sole suppliers of compound steam reciprocating machinery. Their first such engine at sea was fitted in 1854 on the SS Brandon for the Limerick Steamship Company; the ship showed an improved performance by using a third less coal, which he was able to reduce still further on later designs.
    Elder developed steam jacketing and recognized that, with higher pressures, triple-expansion types would be even more economical. In 1862 he patented a design of quadruple-expansion engine with reheat between cylinders and advocated the importance of balancing reciprocating parts. The effect of his improvements was to greatly reduce fuel consumption so that long sea voyages became an economic reality.
    His yard soon reached dimensions then unequalled on the Clyde where he employed over 4,000 workers; Elder also was always interested in the social welfare of his labour force. In 1860 the engine shops were moved to the Govan Old Shipyard, and again in 1864 to the Fairfield Shipyard, about 1 mile (1.6 km) west on the south bank of the Clyde. At Fairfield, shipbuilding was commenced, and with the patents for compounding secure, much business was placed for many years by shipowners serving long-distance trades such as South America; the Pacific Steam Navigation Company took up his ideas for their ships. In later years the yard became known as the Fairfield Shipbuilding and Engineering Company Ltd, but it remains today as one of Britain's most efficient shipyards and is known now as Kvaerner Govan Ltd.
    In 1869, at the age of only 45, John Elder was unanimously elected President of the Institution of Engineers and Shipbuilders in Scotland; however, before taking office and giving his eagerly awaited presidential address, he died in London from liver disease. A large multitude attended his funeral and all the engineering shops were silent as his body, which had been brought back from London to Glasgow, was carried to its resting place. In 1857 Elder had married Isabella Ure, and on his death he left her a considerable fortune, which she used generously for Govan, for Glasgow and especially the University. In 1883 she endowed the world's first Chair of Naval Architecture at the University of Glasgow, an act which was reciprocated in 1901 when the University awarded her an LLD on the occasion of its 450th anniversary.
    [br]
    Principal Honours and Distinctions
    President, Institution of Engineers and Shipbuilders in Scotland 1869.
    Further Reading
    Obituary, 1869, Engineer 28.
    1889, The Dictionary of National Biography, London: Smith Elder \& Co. W.J.Macquorn Rankine, 1871, "Sketch of the life of John Elder" Transactions of the
    Institution of Engineers and Shipbuilders in Scotland.
    Maclehose, 1886, Memoirs and Portraits of a Hundred Glasgow Men.
    The Fairfield Shipbuilding and Engineering Works, 1909, London: Offices of Engineering.
    P.M.Walker, 1984, Song of the Clyde, A History of Clyde Shipbuilding, Cambridge: PSL.
    R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge: Cambridge University Press (covers Elder's contribution to the development of steam engines).
    RLH / FMW

    Biographical history of technology > Elder, John

  • 14 Harrison, John

    [br]
    b. 24 March 1693 Foulby, Yorkshire, England
    d. 24 March 1776 London, England
    [br]
    English horologist who constructed the first timekeeper of sufficient accuracy to determine longitude at sea and invented the gridiron pendulum for temperature compensation.
    [br]
    John Harrison was the son of a carpenter and was brought up to that trade. He was largely self-taught and learned mechanics from a copy of Nicholas Saunderson's lectures that had been lent to him. With the assistance of his younger brother, James, he built a series of unconventional clocks, mainly of wood. He was always concerned to reduce friction, without using oil, and this influenced the design of his "grasshopper" escapement. He also invented the "gridiron" compensation pendulum, which depended on the differential expansion of brass and steel. The excellent performance of his regulator clocks, which incorporated these devices, convinced him that they could also be used in a sea dock to compete for the longitude prize. In 1714 the Government had offered a prize of £20,000 for a method of determining longitude at sea to within half a degree after a voyage to the West Indies. In theory the longitude could be found by carrying an accurate timepiece that would indicate the time at a known longitude, but the requirements of the Act were very exacting. The timepiece would have to have a cumulative error of no more than two minutes after a voyage lasting six weeks.
    In 1730 Harrison went to London with his proposal for a sea clock, supported by examples of his grasshopper escapement and his gridiron pendulum. His proposal received sufficient encouragement and financial support, from George Graham and others, to enable him to return to Barrow and construct his first sea clock, which he completed five years later. This was a large and complicated machine that was made out of brass but retained the wooden wheelwork and the grasshopper escapement of the regulator clocks. The two balances were interlinked to counteract the rolling of the vessel and were controlled by helical springs operating in tension. It was the first timepiece with a balance to have temperature compensation. The effect of temperature change on the timekeeping of a balance is more pronounced than it is for a pendulum, as two effects are involved: the change in the size of the balance; and the change in the elasticity of the balance spring. Harrison compensated for both effects by using a gridiron arrangement to alter the tension in the springs. This timekeeper performed creditably when it was tested on a voyage to Lisbon, and the Board of Longitude agreed to finance improved models. Harrison's second timekeeper dispensed with the use of wood and had the added refinement of a remontoire, but even before it was tested he had embarked on a third machine. The balance of this machine was controlled by a spiral spring whose effective length was altered by a bimetallic strip to compensate for changes in temperature. In 1753 Harrison commissioned a London watchmaker, John Jefferys, to make a watch for his own personal use, with a similar form of temperature compensation and a modified verge escapement that was intended to compensate for the lack of isochronism of the balance spring. The time-keeping of this watch was surprisingly good and Harrison proceeded to build a larger and more sophisticated version, with a remontoire. This timekeeper was completed in 1759 and its performance was so remarkable that Harrison decided to enter it for the longitude prize in place of his third machine. It was tested on two voyages to the West Indies and on both occasions it met the requirements of the Act, but the Board of Longitude withheld half the prize money until they had proof that the timekeeper could be duplicated. Copies were made by Harrison and by Larcum Kendall, but the Board still continued to prevaricate and Harrison received the full amount of the prize in 1773 only after George III had intervened on his behalf.
    Although Harrison had shown that it was possible to construct a timepiece of sufficient accuracy to determine longitude at sea, his solution was too complex and costly to be produced in quantity. It had, for example, taken Larcum Kendall two years to produce his copy of Harrison's fourth timekeeper, but Harrison had overcome the psychological barrier and opened the door for others to produce chronometers in quantity at an affordable price. This was achieved before the end of the century by Arnold and Earnshaw, but they used an entirely different design that owed more to Le Roy than it did to Harrison and which only retained Harrison's maintaining power.
    [br]
    Principal Honours and Distinctions
    Royal Society Copley Medal 1749.
    Bibliography
    1767, The Principles of Mr Harrison's Time-keeper, with Plates of the Same, London. 1767, Remarks on a Pamphlet Lately Published by the Rev. Mr Maskelyne Under the
    Authority of the Board of Longitude, London.
    1775, A Description Concerning Such Mechanisms as Will Afford a Nice or True Mensuration of Time, London.
    Further Reading
    R.T.Gould, 1923, The Marine Chronometer: Its History and Development, London; reprinted 1960, Holland Press.
    —1978, John Harrison and His Timekeepers, 4th edn, London: National Maritime Museum.
    H.Quill, 1966, John Harrison, the Man who Found Longitude, London. A.G.Randall, 1989, "The technology of John Harrison's portable timekeepers", Antiquarian Horology 18:145–60, 261–77.
    J.Betts, 1993, John Harrison London (a good short account of Harrison's work). S.Smiles, 1905, Men of Invention and Industry; London: John Murray, Chapter III. Dictionary of National Biography, Vol. IX, pp. 35–6.
    DV

    Biographical history of technology > Harrison, John

  • 15 Psychology

       We come therefore now to that knowledge whereunto the ancient oracle directeth us, which is the knowledge of ourselves; which deserveth the more accurate handling, by how much it toucheth us more nearly. This knowledge, as it is the end and term of natural philosophy in the intention of man, so notwithstanding it is but a portion of natural philosophy in the continent of nature.... [W]e proceed to human philosophy or Humanity, which hath two parts: the one considereth man segregate, or distributively; the other congregate, or in society. So as Human philosophy is either Simple and Particular, or Conjugate and Civil. Humanity Particular consisteth of the same parts whereof man consisteth; that is, of knowledges which respect the Body, and of knowledges that respect the Mind... how the one discloseth the other and how the one worketh upon the other... [:] the one is honored with the inquiry of Aristotle, and the other of Hippocrates. (Bacon, 1878, pp. 236-237)
       The claims of Psychology to rank as a distinct science are... not smaller but greater than those of any other science. If its phenomena are contemplated objectively, merely as nervo-muscular adjustments by which the higher organisms from moment to moment adapt their actions to environing co-existences and sequences, its degree of specialty, even then, entitles it to a separate place. The moment the element of feeling, or consciousness, is used to interpret nervo-muscular adjustments as thus exhibited in the living beings around, objective Psychology acquires an additional, and quite exceptional, distinction. (Spencer, 1896, p. 141)
       Kant once declared that psychology was incapable of ever raising itself to the rank of an exact natural science. The reasons that he gives... have often been repeated in later times. In the first place, Kant says, psychology cannot become an exact science because mathematics is inapplicable to the phenomena of the internal sense; the pure internal perception, in which mental phenomena must be constructed,-time,-has but one dimension. In the second place, however, it cannot even become an experimental science, because in it the manifold of internal observation cannot be arbitrarily varied,-still less, another thinking subject be submitted to one's experiments, comformably to the end in view; moreover, the very fact of observation means alteration of the observed object. (Wundt, 1904, p. 6)
       It is [Gustav] Fechner's service to have found and followed the true way; to have shown us how a "mathematical psychology" may, within certain limits, be realized in practice.... He was the first to show how Herbart's idea of an "exact psychology" might be turned to practical account. (Wundt, 1904, pp. 6-7)
       "Mind," "intellect," "reason," "understanding," etc. are concepts... that existed before the advent of any scientific psychology. The fact that the naive consciousness always and everywhere points to internal experience as a special source of knowledge, may, therefore, be accepted for the moment as sufficient testimony to the rights of psychology as science.... "Mind," will accordingly be the subject, to which we attribute all the separate facts of internal observation as predicates. The subject itself is determined p. 17) wholly and exclusively by its predicates. (Wundt, 1904,
       The study of animal psychology may be approached from two different points of view. We may set out from the notion of a kind of comparative physiology of mind, a universal history of the development of mental life in the organic world. Or we may make human psychology the principal object of investigation. Then, the expressions of mental life in animals will be taken into account only so far as they throw light upon the evolution of consciousness in man.... Human psychology... may confine itself altogether to man, and generally has done so to far too great an extent. There are plenty of psychological text-books from which you would hardly gather that there was any other conscious life than the human. (Wundt, 1907, pp. 340-341)
       The Behaviorist began his own formulation of the problem of psychology by sweeping aside all medieval conceptions. He dropped from his scientific vocabulary all subjective terms such as sensation, perception, image, desire, purpose, and even thinking and emotion as they were subjectively defined. (Watson, 1930, pp. 5-6)
       According to the medieval classification of the sciences, psychology is merely a chapter of special physics, although the most important chapter; for man is a microcosm; he is the central figure of the universe. (deWulf, 1956, p. 125)
       At the beginning of this century the prevailing thesis in psychology was Associationism.... Behavior proceeded by the stream of associations: each association produced its successors, and acquired new attachments with the sensations arriving from the environment.
       In the first decade of the century a reaction developed to this doctrine through the work of the Wurzburg school. Rejecting the notion of a completely self-determining stream of associations, it introduced the task ( Aufgabe) as a necessary factor in describing the process of thinking. The task gave direction to thought. A noteworthy innovation of the Wurzburg school was the use of systematic introspection to shed light on the thinking process and the contents of consciousness. The result was a blend of mechanics and phenomenalism, which gave rise in turn to two divergent antitheses, Behaviorism and the Gestalt movement. The behavioristic reaction insisted that introspection was a highly unstable, subjective procedure.... Behaviorism reformulated the task of psychology as one of explaining the response of organisms as a function of the stimuli impinging upon them and measuring both objectively. However, Behaviorism accepted, and indeed reinforced, the mechanistic assumption that the connections between stimulus and response were formed and maintained as simple, determinate functions of the environment.
       The Gestalt reaction took an opposite turn. It rejected the mechanistic nature of the associationist doctrine but maintained the value of phenomenal observation. In many ways it continued the Wurzburg school's insistence that thinking was more than association-thinking has direction given to it by the task or by the set of the subject. Gestalt psychology elaborated this doctrine in genuinely new ways in terms of holistic principles of organization.
       Today psychology lives in a state of relatively stable tension between the poles of Behaviorism and Gestalt psychology.... (Newell & Simon, 1963, pp. 279-280)
       As I examine the fate of our oppositions, looking at those already in existence as guide to how they fare and shape the course of science, it seems to me that clarity is never achieved. Matters simply become muddier and muddier as we go down through time. Thus, far from providing the rungs of a ladder by which psychology gradually climbs to clarity, this form of conceptual structure leads rather to an ever increasing pile of issues, which we weary of or become diverted from, but never really settle. (Newell, 1973b, pp. 288-289)
       The subject matter of psychology is as old as reflection. Its broad practical aims are as dated as human societies. Human beings, in any period, have not been indifferent to the validity of their knowledge, unconcerned with the causes of their behavior or that of their prey and predators. Our distant ancestors, no less than we, wrestled with the problems of social organization, child rearing, competition, authority, individual differences, personal safety. Solving these problems required insights-no matter how untutored-into the psychological dimensions of life. Thus, if we are to follow the convention of treating psychology as a young discipline, we must have in mind something other than its subject matter. We must mean that it is young in the sense that physics was young at the time of Archimedes or in the sense that geometry was "founded" by Euclid and "fathered" by Thales. Sailing vessels were launched long before Archimedes discovered the laws of bouyancy [ sic], and pillars of identical circumference were constructed before anyone knew that C IID. We do not consider the ship builders and stone cutters of antiquity physicists and geometers. Nor were the ancient cave dwellers psychologists merely because they rewarded the good conduct of their children. The archives of folk wisdom contain a remarkable collection of achievements, but craft-no matter how perfected-is not science, nor is a litany of successful accidents a discipline. If psychology is young, it is young as a scientific discipline but it is far from clear that psychology has attained this status. (Robinson, 1986, p. 12)

    Historical dictionary of quotations in cognitive science > Psychology

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