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1 описание прототипа
Русско-английский словарь по электронике > описание прототипа
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2 описание прототипа
Русско-английский словарь по радиоэлектронике > описание прототипа
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3 point
point [pwɛ̃]━━━━━━━━━2. compounds━━━━━━━━━1. <a. pointb. ( = endroit) place ; (Astronomy, mathematics) pointc. ( = position) (Aviation, nautical) position• et maintenant, le point sur la grève des transports and now, the latest on the transport striked. ( = marque) (Mus, morse, sur i) dot ; ( = ponctuation) full stop (Brit), period (US) ; ( = petite tache) spot• tu n'iras pas, un point c'est tout you're not going and that's all there is to ite. (sur devoir) markf. [de couture, tricot] stitch• faire le point de la situation ( = examiner) to take stock of the situation ; ( = faire un compte rendu) to sum up the situation► à point [fruit] just ripe ; [fromage] just right for eating ; [viande] medium• le rôti est cuit à point the roast is done to a turn► à point (nommé) [arriver, venir] just at the right moment• est-il possible d'être bête à ce point ! how stupid can you get? (inf)• elles se ressemblent à tel point or à ce point qu'on pourrait les confondre they look so alike that you could easily mistake one for the other► au point [photo] in focus ; [affaire] completely settled ; [technique, machine] perfected• ce n'est pas encore au point it isn't quite up to scratch yet► au point de + infinitif so much that• il aimait le Québec au point d'y passer toutes ses vacances he loved Quebec so much that he spent all his holidays there• il se détestent au point qu'ils ne se parlent plus they hate each other so much that they've stopped speaking► au point où• en être arrivé au point où... to have reached the point where...• on continue ? -- au point où on en est ! shall we go on? -- we've got this far so we might as well!► au plus haut point [détester, admirer] intensely• se méfier au plus haut point de qch to be highly sceptical about sth► mettre au point [+ photo, caméra] to focus ; [+ stratégie, technique] to perfect ; [+ médicament, invention, système] to develop ; [+ projet] to finalize• mettre une affaire au point avec qn to finalize all the details of a matter with sb► mise au point [d'appareil photo, caméra] focusing ; [de stratégie, technique] perfecting ; [de médicament, invention, système] development ; [de moteur] tuning ; [d'affaire, projet] finalizing ; ( = explication, correction) clarification• publier une mise au point to issue a statement (setting the record straight)► en tout point, en tous points in every respect2. <• vous avez un point de chute à Rome ? do you have somewhere to stay in Rome? ► point commun• nous voilà revenus au point de départ so we're back to square one (inf) ► point de distribution [d'eau] supply point ; (Business) distribution outlet• mettre un point d'honneur à faire qch to make it a point of honour to do sth ► point d'interrogation question mark• au point mort [voiture] in neutral ; [de négociations, affaires] at a standstill ► point mousse garter stitch► points de retraite points based on social security contributions that count towards one's pension• quel est votre point de vue sur ce sujet ? what's your point of view on this matter?* * *pwɛ̃
1.
nom masculin1) ( endroit) point2) ( situation) point; Nautisme positionêtre sur le point de faire — to be just about to do, to be on the point of doing
j'en suis toujours au même point (qu'hier/qu'il y a un an) — I'm still exactly where I was (yesterday/last year)
au point où j'en suis, ça n'a pas d'importance! — I've reached the point where it doesn't matter any more!
faire le point — Nautisme to take bearings; fig to take stock of the situation
3) ( degré)‘j'en aurais pleuré’ - ‘ah bon, à ce point?’ — ‘I could have cried’ - ‘really? it was that bad?’
il est têtu à un point! — (colloq) he's so incredibly stubborn!
jusqu'à un certain point — up to a (certain) point, to a certain extent
4) ( question particulière) point; ( dans un ordre du jour) item, pointen tout point, en tous points — in every respect ou way
5) ( marque visible) dot6) Jeux, Sport pointmarquer/perdre des points — lit, fig to score/to lose points
7) ( pour évaluer) mark GB, point USavoir sept points d'avance/de retard — to be seven marks ahead/behind
obtenir or avoir 27 points sur 40 — to get 27 out of 40
être un mauvais point pour quelqu'un/quelque chose — to be a black mark against somebody/something
8) ( dans un système de calcul) pointle permis à points — system whereby driving offender gets penalty points
9) Mathématique point10) Linguistique ( en ponctuation) full stop GB, period USpoint à la ligne — ( dans une dictée) full stop, new paragraph
point final — ( dans une dictée) full stop
mettre un point final à quelque chose — fig to put a stop ou an end to something
je n'irai pas, point final! — (colloq) I'm not going, full stop GB ou period US!
tu vas te coucher un point c'est tout! — (colloq) you're going to bed and that's final!
11) Musique dot12) ( en typographie) point14) (en couture, tricot) stitch
2.
(dated) adverbe not
3.
à point locution adverbiale1) ( en temps voulu) just in time2) Culinaire
4.
au point locutionêtre au point — [système, machine] to be well designed; [spectacle] to be well put together
mettre au point — ( élaborer) to perfect [système]; to work out, to devise [accord, plan]; to develop [vaccin, appareil]; ( régler) to adjust
mise au point — ( de système) perfecting; ( de vaccin) development; ( réglage) adjusting; Photographie focus; fig ( déclaration) clarifying statement
faire la mise au point — Photographie to focus
faire une mise au point — fig to set the record straight ( sur about)
Phrasal Verbs:••* * *pwɛ̃1. nm1) (= marque, signe) dot2) [ponctuation] full stop Grande-Bretagne period USA3) (= moment) pointNous en sommes au même point. — We have reached the same point.
J'étais sur le point de te téléphoner. — I was just about to phone you.
4) (= degré)à ce point abîmé que... — so damaged that...
au point que; à tel point que — so much so that
5) (au score) point6) (= aspect) pointJe ne suis pas d'accord sur ce point. — I don't agree on this point.
7) (= endroit) spot, point, (en géométrie) point8) COUTURE, TRICOT stitchpoint mousse — garter stitch, plain
9) CUISINE"Comment voulez-vous votre steak?" — "À point." — "How would you like your steak?" — "Medium."
faire le point NAVIGATION — to take a bearing, figto take stock
faire le point sur — to review, to take stock of
mettre au point [mécanisme, procédé] — to develop, [appareil-photo] to focus
2. advlit (= pas) notpoint n'est besoin de... — there is no need to...
point de... — no...
3. vbSee:* * *A nm1 ( endroit) point; un point précis du globe/sur une carte a particular point on the earth/on a map; un point de ravitaillement/ralliement a staging/rallying point; un point de rencontre a meeting point; point de vente (sales) outlet; serrure 3 points 3 point lock;2 ( situation) point; Naut position; être sur le point de faire to be just about to do, to be on the point of doing; j'étais sur le point de leur dire/d'abandonner/de partir I was just about to tell them/to give up/to leave, I was on the point of telling them/giving up/leaving; j'en suis toujours au même point (qu'hier/qu'il y a un an) I'm still exactly where I was (yesterday/last year); au point où j'en suis, ça n'a pas d'importance! I've reached the point where it doesn't matter any more!; il en est au point où il allume une cigarette en se levant he's got GB ou gotten US to the stage ou point where he lights a cigarette as soon as he gets up; faire le point Naut to take bearings; fig to take stock of the situation; faire le point sur la situation économique/sur la recherche scientifique fig to take stock of the economic situation/of scientific research; faire le point sur la circulation (routière)/l'actualité to give an up-to-the-minute report on the traffic news/current situation;3 ( degré) il m'agace/m'inquiète au plus haut point he annoys me/worries me intensely; la circulation était à ce point bloquée que j'ai dû laisser ma voiture au bord de la route the traffic was so bad that I had to leave my car on the side of the road; je ne le pensais pas bête/coléreux à ce point I didn't think he was that stupid/quick-tempered; ‘j'en aurais pleuré’-‘ah bon, à ce point?’ ‘I could have cried’-‘really? it was that bad?’; je sais à quel point elle est triste/sensible I know how sad/sensitive she is; si tu savais à quel point il m'agace! if you only knew how much he annoys me!; au point que to the extent that; à tel point que to such an extent that…; douloureux/endommagé à (un) tel or au point que so painful/badly damaged that; la situation s'est aggravée au point qu'ils ont dû appeler la police the situation became so bad that the police had to be called in; le temps s'est rafraîchi au point qu'il a fallu remettre le chauffage the weather got so cold that the heating had to be put back on; il est têtu à un point! he's so incredibly stubborn!; jusqu'à un certain point up to a (certain) point, to a certain extent;4 ( question particulière) point; ( dans un ordre du jour) item, point; un programme en trois points a three-point plan; un point fondamental/de détail (d'un texte) a basic/minor point (in a text); sur ce point on this point; j'aimerais revenir sur ce dernier point I would like to come back to that last point; un point de désaccord/litige a point of disagreement/contention; reprendre un texte point par point to go over a text point by point; en tout point, en tous points in every respect ou way; une politique en tous points désastreuse a policy that is disastrous in every respect; les deux modèles sont semblables en tous points the two models are alike in every respect;5 ( marque visible) gén dot; les villes sont marquées par un point towns are marked by a dot; il y a un point sur le i et le j there's a dot on the i and the j; un point lumineux/rouge dans le lointain a light/a red dot in the distance; bientôt, le navire ne fut qu'un point à l'horizon soon, the ship was a mere dot ou speck on the horizon; un point de colle a spot of glue; un point de rouille a speck of rust; points de graissage lubricating points; ⇒ i;6 Jeux, Sport point; marquer/perdre des points lit, fig to score/lose points; compter les points to keep (the) score; un point partout! one all!; battre son adversaire aux points to beat one's opponent on points; remporter une victoire aux points to win on points;7 ( pour évaluer) mark GB, point US; avoir sept points d'avance to be seven marks ahead; avoir dix points de retard to be ten marks behind; il m'a manqué trois points pour réussir I failed by three marks; enlever un point par faute to take a mark off for each mistake; obtenir or avoir 27 points sur 40 to get 27 out of 40; être un bon point pour to be a plus point for; être un mauvais point pour qn/qch to be a black mark against sb/sth;8 ( dans un système de calcul) point; la livre a perdu trois points the pound lost three points; le taux de chômage a augmenté de 0,8 points the unemployment rate rose by 0.8 points; le permis à points system whereby driving offender gets penalty points; il a perdu sept points dans les sondages he's gone down seven points in the polls;9 Math point; point d'intersection/d'inflexion point of intersection/of inflection;10 Ling ( en ponctuation) full stop GB, period US; mettre un point to put a full stop; point à la ligne ( dans une dictée) full stop, new paragraph; point final ( dans une dictée) full stop; mettre un point final à qch fig to put a stop ou an end to sth; je n'irai pas, point final○! I'm not going, full stop GB ou period US!; tu vas te coucher un point c'est tout○! you're going to bed and that's final!;11 Mus dot;12 Imprim point;13 Méd ( douleur) pain; avoir un point à la poitrine/à l'aine to have a pain in the chest/in the groin;14 (en couture, tricot) stitch; faire un point à qch to put a few stitches in sth; dentelle au point de Venise Venetian lace.B †adv not; tu ne tueras point Bible thou shalt not kill; je n'en ai point I don't have any; ‘tu es fâché?’-‘non point!’ ‘are you angry?’-‘not at all’.C à point loc adv venir/arriver à point to come/arrive just in time; venir/arriver or tomber à point nommé to come/arrive just at the right moment; faire cuire à point to cook [sth] medium rare [viande]; bifteck (cuit) à point medium rare steak; le camembert est à point the camembert is ready to eat.D au point loc adv, loc adj être au point [système, méthode, machine] to be well designed; [spectacle, émission] to be well put together; leur système/machine/spectacle n'est pas encore très au point their system/machine/show still needs some working on; le nouveau modèle est très au point the new model is very well designed; le spectacle n'était pas du tout au point the show wasn't up to scratch; le prototype n'est pas encore au point the prototype isn't quite ready yet; ça fait des semaines qu'ils répètent mais leur numéro n'est pas encore au point they've been rehearsing for weeks but they still haven't got GB ou gotten US it quite right; je ne suis pas au point pour les examens I'm not ready for the exams; mettre [qch] au point ( inventer) to perfect [théorie, système, méthode, technique]; to work out, to devise [accord, plan de paix, stratégie]; to develop [vaccin, médicament, appareil]; ( régler) to adjust [machine, mécanisme]; il leur reste deux semaines pour finir de mettre leur spectacle au point they've got two more weeks to put the finishing touches to their show; mettre au point sur qch Phot to focus on sth; mise au point Phot focus; fig ( déclaration) clarifying statement; la mise au point est automatique sur mon appareil my camera has automatic focus; faire la mise au point Phot to focus (sur on); faire une mise au point fig to set the record straight (sur about); mise au point ( invention) (de théorie, système, méthode, technique) perfecting; (de médicament, vaccin) development; ( réglage) (de machine, mécanisme) adjusting; Phot focus.point d'acupuncture Méd acupuncture point; point d'ancrage Aut anchor; fig base; point d'appui Mil base of operations; Phys fulcrum; gén support; les piliers servent de point d'appui à la charpente the roof structure is supported by the pillars; trouver un point d'appui à une échelle to find a support for a ladder; point arrière Cout back stitch; point d'attache base; point de bâti Cout tacking stitch; point blanc whitehead; point de blé ( en tricot) double moss stitch; point de boutonnière Cout buttonhole stitch; point cardinal Phys, Géog compass ou cardinal point; point de chaînette ( en broderie) chain stitch; point de chausson ( en broderie) herringbone stitch; point chaud trouble ou hot spot; les points chauds du globe the world's trouble spots; point de chute fig port of call; point commun mutual interest; nous avons beaucoup de points communs we have a lot in common; ils n'ont aucun point commun they have nothing in common; point de congestion† Méd slight congestion of the lung; point de côtes ( en tricot) rib; point de côté ( douleur) stitch; ( en couture) slip stitch; avoir un point de côté to have a stitch in one's side; point de croix ( en broderie) cross stitch; point de départ lit, fig starting point; nous revoilà à notre point de départ fig we're back to square one; point de devant Cout running stitch; point d'eau ( naturel) watering place; ( robinet) water tap GB ou faucet US; point d'ébullition boiling point; point d'épine ( en broderie) featherstitch; point d'exclamation Ling exclamation mark; point faible weak point; point de feston ( en broderie) blanket stitch; point fort strong point; point de fuite Art, Archit vanishing point; point de fusion melting point; point G G-spot; point d'interrogation Ling question mark; point de jersey ( en tricot) stocking stitch; point du jour daybreak; au point du jour at daybreak; point de liquéfaction liquefaction point; point de mire Mil target; fig focal point; point mousse ( en tricot) garter stitch; point mort Aut neutral; se mettre or passer/être au point mort Aut to put the car into/to be in neutral; être au point mort fig [affaires, consommation] to be at a standstill; [négociations] to be in a state of deadlock; point noir ( comédon) blackhead; ( problème) problem; ( sur la route) blackspot; l'inflation reste le seul point noir inflation is the only problem; point de non-retour point of no return; point d'orgue Mus pause sign; fig culmination; point d'ourlet Cout hemstitch; point de penalty penalty spot; point de piqûre Cout back stitch; point de presse Journ press briefing; point de repère ( spatial) landmark; (temporel, personnel) point of reference; point de reprise Cout darning stitch; point de retraite Prot Soc point which counts towards a retirement pension scheme; point de riz ( en tricot) moss stitch; point de surfil Cout whipstitch; point de suture Méd stitch; point de tige ( en broderie) stem stitch; point de torsade ( en tricot) cable stitch; point de vue ( paysage) viewpoint; ( opinion) point of view; du point de vue de la direction from the management's point of view; du point de vue de l'efficacité/du sens as far as efficiency/meaning is concerned; d'un point de vue économique c'est rentable/intéressant from a financial point of view it's profitable/attractive; points de suspension suspension points.être mal en point to be in a bad way.I[pwɛ̃] adverbe1. [en corrélation avec 'ne']2. [employé seul]du vin il y en avait, mais de champagne point there was wine, but no champagne ou not a drop of champagneil eut beau chercher, point de John he searched in vain, John was nowhere to be foundpoint de démocratie sans liberté de critiquer (there can be) no democracy without the freedom to criticize3. [en réponse négative]point du tout! not at all!, not in the least!II[pwɛ̃] nom masculinpoint lumineux spot ou point of lightpoint de rouille speck ou spot of rustun point de soudure a spot ou blob of solder3. [symbole graphique - en fin de phrase] full stop (UK), period (US) ; [ - sur un i ou un j] dot ; [ - en morse, en musique] dotj'ai dit non, point final ou un point c'est tout! (figuré) I said no and that's that ou that's final ou there's an end to it!mettre un point final à une discussion to terminate a discussion, to bring a discussion to an endpoint estimé/observé estimated/observed positiona. NAUTIQUE to take a bearing, to plot one's positionà 40 ans, on s'arrête et on fait le point when you reach 40, you stand back and take stock of your lifeet maintenant, le point sur la circulation and now, the latest traffic newspoint d'intersection/de tangence intersection/tangential pointen plusieurs points de la planète in different places ou spots on the planet9. [degré] point10. [élément - d'un texte, d'une théorie] point ; [ - d'un raisonnement] point, item ; [ - d'une description] feature, traitvoici un point d'histoire que je souhaiterais éclaircir I'd like to make clear what happened at that particular point in historypoint d'entente/de désaccord point of agreement/of disagreement11. [unité de valeur - dans un sondage, à la Bourse] point ; [ - de retraite] unit ; [ - du salaire de base] (grading) pointsa cote de popularité a gagné/perdu trois points his popularity rating has gone up/down by three pointsbattu aux points [en boxe] beaten on pointsfaire le point [le gagner] to win the pointb. [appréciation] mark (for good behaviour)12. COUTUREfaire un point à to put a stitch ou a few stitches inpoint de couture/crochet/tricot sewing/crochet/knitting stitch13. INFORMATIQUE [unité graphique] dot[emplacement]point d'accès/de retour entry/reentry point————————à ce point, à un tel point locution adverbialeton travail est dur à ce point? is your job so (very) ou that hard?j'en ai tellement assez que je vais démissionner — à ce point? I'm so fed up that I'm going to resign — that bad, is it?————————à ce point que, à (un) tel point que locution conjonctiveso much so that, to such a point thatles choses en étaient arrivées à un tel point que... things had reached such a pitch that...elle est déprimée, à ce point qu'elle ne veut plus voir personne she's so depressed that she won't see anyone anymore————————à point locution adjectivale[steak] medium[rôti] done to a turn[poire] just ou nicely ripeton bonhomme est à point, tu n'as plus qu'à enregistrer ses aveux (familier & figuré) your man's nice and ready now, all you've got to do is get the confession down on tape————————à point locution adverbiale1. CUISINE2. [au bon moment]a. [personne] to come (just) at the right timeb. [arrivée, décision] to be very timely————————à point nommé locution adverbialearriver à point nommé to arrive (just) at the right moment ou when needed, to arrive in the nick of timeau plus haut point locution adverbialeje le déteste au plus haut point I can't tell you how much I hate him, I absolutely loathe him————————au point locution adjectivale[moteur] tuned[machine] in perfect running order[technique] perfected[discours, plaidoyer] finalized[spectacle, artiste] readyton revers n'est pas encore au point your backhand isn't good enough ou up to scratch yetle son/l'image n'est pas au point the sound/the image isn't right————————au point locution adverbialea. [texte à imprimer] to editb. [discours, projet, rapport] to finalize, to put the finishing touches toc. [spectacle] to perfectd. [moteur] to tunee. [appareil photo] to (bring into) focusmettre les choses au point to put ou set the record straightmettons les choses au point: je refuse de travailler le dimanche let's get this ou things straight: I refuse to work Sundaysaprès cette discussion, j'ai tenu à mettre les choses au point following that discussion, I insisted on putting ou setting the record straight————————au point de locution prépositionnelle————————au point du jour locution adverbiale(littéraire) at dawn ou daybreakau point où locution conjonctivenous sommes arrivés au point où... we've reached the point ou stage where...au point où j'en suis, autant que je continue having got this far, I might as well carry onau point où en sont les choses as things stand, the way things are (now)————————au point que locution conjonctiveso much that, so... thatil était très effrayé, au point qu'il a essayé de se sauver he was so frightened that he tried to run awaypoint par point locution adverbialesur le point de locution prépositionnelleêtre sur le point de faire quelque chose to be about to do ou on the point of doing ou on the verge of doing somethingj'étais sur le point de partir I was about to ou going to leavesur le point de pleurer on the verge of tears ou of crying————————point d'ancrage nom masculin————————point d'appui nom masculin1. [d'un levier] fulcrumpoint de chute nom masculin2. (figuré)————————point culminant nom masculinquel est le point culminant des Alpes? what is the highest point ou peak in the Alps?point de départ nom masculin————————point faible nom masculinson point faible, c'est sa susceptibilité his touchiness is his weak spot ou point————————point fort nom masculin[d'une personne, d'une entreprise] strong point[d'un joueur de tennis] best shotles maths n'ont jamais été mon point fort I was never any good at maths, maths was never my strong point————————point mort nom masculin————————point noir nom masculina. [encombré] a heavily congested areab. [dangereux] an accident blackspot————————point sensible nom masculin1. [endroit douloureux] tender ou sore spot2. MILITAIRE key ou strategic target3. (figuré)a. [chez quelqu'un] to touch on a sore spotb. [dans un problème] to touch on a sensitive area -
4 Hetzel, Max
[br]b. 5 March 1921 Basle, Switzerland[br]Swiss electrical engineer who invented the tuning-fork watch.[br]Hetzel trained as an electrical engineer at the Federal Polytechnic in Zurich and worked for several years in the field of telecommunications before joining the Bulova Watch Company in 1950. At that time several companies were developing watches with electromagnetically maintained balances, but they represented very little advance on the mechanical watch and the mechanical switching mechanism was unreliable. In 1952 Hetzel started work on a much more radical design which was influenced by a transistorized tuning-fork oscillator that he had developed when he was working on telecommunications. Tuning forks, whose vibrations were maintained electromagnetically, had been used by scientists during the nineteenth century to measure small intervals of time, but Niaudet- Breguet appears to have been the first to use a tuning fork to control a clock. In 1866 he described a mechanically operated tuning-fork clock manufactured by the firm of Breguet, but it was not successful, possibly because the fork did not compensate for changes in temperature. The tuning fork only became a precision instrument during the 1920s, when elinvar forks were maintained in vibration by thermionic valve circuits. Their primary purpose was to act as frequency standards, but they might have been developed into precision clocks had not the quartz clock made its appearance very shortly afterwards. Hetzel's design was effectively a miniaturized version of these precision devices, with a transistor replacing the thermionic valve. The fork vibrated at a frequency of 360 cycles per second, and the hands were driven mechanically from the end of one of the tines. A prototype was working by 1954, and the watch went into production in 1960. It was sold under the tradename Accutron, with a guaranteed accuracy of one minute per month: this was a considerable improvement on the performance of the mechanical watch. However, the events of the 1920s were to repeat themselves, and by the end of the decade the Accutron was eclipsed by the introduction of quartz-crystal watches.[br]Principal Honours and DistinctionsNeuchâtel Observatory Centenary Prize 1958. Swiss Society for Chronometry Gold Medal 1988.Bibliography"The history of the “Accutron” tuning fork watch", 1969, Swiss Watch \& Jewellery Journal 94:413–5.Further ReadingR.Good, 1960, "The Accutron", Horological Journal 103:346–53 (for a detailed technical description).J.D.Weaver, 1982, Electrical \& Electronic Clocks \& Watches, London (provides a technical description of the tuning-fork watch in its historical context).DV -
5 Barber, John
[br]baptized 22 October 1734 Greasley, Nottinghamshire, Englandd. 6 November 1801 Attleborough, Nuneaton, England[br]English inventor of the gas turbine and jet propulsion.[br]He was the son of Francis Barber, coalmaster of Greasley, and Elizabeth Fletcher. In his will of 1765. his uncle, John Fletcher, left the bulk of his property, including collieries and Stainsby House, Horsley Woodhouse, Derbyshire, to John Barber. Another uncle, Robert, bequeathed him property in the next village, Smalley. It is clear that at this time John Barber was a man of considerable means. On a tablet erected by John in 1767, he acknowledges his debt to his uncle John in the words "in remembrance of the man who trained him up from a youth". At this time John Barber was living at Stainsby House and had already been granted his first patent, in 1766. The contents of this patent, which included a reversible water turbine, and his subsequent patents, suggest that he was very familiar with mining equipment, including the Newcomen engine. It comes as rather a surprise that c.1784 he became bankrupt and had to leave Stainsby House, evidently moving to Attleborough. In a strange twist, a descendent of Mr Sitwell, the new owner, bought the prototype Akroyd Stuart oil engine from the Doncaster Show in 1891.The second and fifth (final) patents, in 1773 and 1792, were concerned with smelting and the third, in 1776, featured a boiler-mounted impulse steam turbine. The fourth and most important patent, in 1791, describes and engine that could be applied to the "grinding of corn, flints, etc.", "rolling, slitting, forging or battering iron and other metals", "turning of mills for spinning", "turning up coals and other minerals from mines", and "stamping of ores, raising water". Further, and importantly, the directing of the fluid stream into smelting furnaces or at the stern of ships to propel them is mentioned. The engine described comprised two retorts for heating coal or oil to produce an inflammable gas, one to operate while the other was cleansed and recharged. The resultant gas, together with the right amount of air, passed to a beam-operated pump and a water-cooled combustion chamber, and then to a water-cooled nozzle to an impulse gas turbine, which drove the pumps and provided the output. A clear description of the thermodynamic sequence known as the Joule Cycle (Brayton in the USA) is thus given. Further, the method of gas production predates Murdoch's lighting of the Soho foundry by gas.It seems unlikely that John Barber was able to get his engine to work; indeed, it was well over a hundred years before a continuous combustion chamber was achieved. However, the details of the specification, for example the use of cooling water jackets and injection, suggest that considerable experimentation had taken place.To be active in the taking out of patents over a period of 26 years is remarkable; that the best came after bankruptcy is more so. There is nothing to suggest that the cost of his experiments was the cause of his financial troubles.[br]Further ReadingA.K.Bruce, 1944, "John Barber and the gas turbine", Engineer 29 December: 506–8; 8 March (1946):216, 217.C.Lyle Cummins, 1976, Internal Fire, Carnot Press.JB -
6 Caprotti, Arturo
[br]b. 22 March 1881 Cremona, Italyd. 9 February 1938 Milan, Italy[br]Italian engineer, inventor of Caprotti poppet valve gear for steam locomotives.[br]Caprotti graduated as a mechanical engineer at Turin Royal Polytechnic College and spent some years in the motor car industry. After researching the application of poppet valves to railway locomotives, he invented his rotary cam valve gear for poppet valves in 1915. Compared with usual slide and piston valves and valve gears, it offered independent timing of inlet and exhaust valves and a saving in weight. Valve gear to Caprotti's design was first fitted in 1920 to a 2−6−0 locomotive of the Italian State Railways, and was subsequently widely used there and elsewhere. Caprotti valve gear was first applied in Britain in 1926 to a Claughton class 4−6−0 of the London, Midland \& Scottish Railway, resulting in substantial fuel savings compared with a similar locomotive fitted with Walschaert's valve gear and piston valves. Others of the class were then fitted similarly. Caprotti valve gear never came into general use in Britain and its final application was in 1954 to British Railways class 8 4−6−2 no. 71000; this was intended as the prototype of a class of standard locomotives for express trains, but the class was never built, because diesel and electric locomotives took their place. Some components survived scrapping, and a reconstruction of the locomotive is in working order.[br]Further ReadingJohn Marshall, 1978, A Biographical Dictionary of Railway Engineers, Newton Abbot: David \& Charles.P.Ransome-Wallis (ed.), 1959, The Concise Encyclopaedia of World Railway Locomotives, London: Hutchinson (contains a note about Caprotti (p. 497) and a description of the valve gear (p. 301).PJGR -
7 Rateau, Auguste Camille-Edmond
[br]b. 13 October 1863 Royan, Franced. 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 DistinctionsAcadémie des Sciences, Prix Fourneyron 1899, Prix Poncelet 1911, Member 1918.Bibliography1892, Considérations sur les turbo-machines et en particulier sur les ventilateurs, St- Etienne.1900, Traité des turbo-machines, Paris.1907, Ventilateurs centrifuges à haute pression, Paris.1908. Développement des turbines à vapeur d'échappement, Paris. 1917, Notice sur les travaux scientifiques et techniques, Paris.Further ReadingH.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).WKBiographical history of technology > Rateau, Auguste Camille-Edmond
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8 Séguin, Louis
[br]b. 1869d. 1918[br]French co-designer, with his brother Laurent Séguin (b. 1883 Rhône, France; d. 1944), of the extremely successful Gnome rotary engines.[br]Most early aero-engines were adaptations of automobile engines, but Louis Séguin and his brother Laurent set out to produce a genuine aero-engine. They decided to build a "rotary" engine in which the crankshaft remained stationary and the cylinders rotated: the propeller was attached to the cylinders. The idea was not new, for rotary engines had been proposed by engineers from James Watt to Samuel P. Langley, rival of the Wright brothers. (An engine with stationary cylinders and a rotating crankshaftplus-propeller is classed as a "radial".) Louis Séguin formed the Société des Moteurs Gnome in 1906 to build stationary industrial engines. Laurent joined him to develop a lightweight engine specifically for aeronautical use. They built a fivecylinder air-cooled radial engine in 1908 and then a prototype seven-cylinder rotary engine. Later in the year the Gnome Oméga rotary, developing 50 hp (37 kW), was produced. This was test-flown in a Voisin biplane during June 1909. The Gnome was much lighter than its conventional rivals and surprisingly reliable in view of the technical problems of supplying rotating cylinders with the petrol-air mixture and a spark to ignite it. It was an instant success.Gnomes were mass-produced for use during the First World War. Both sides built and flew rotary engines, which were improved over the years until, by 1917, their size had grown to such an extent that a further increase was not practicable. The gyroscopic effects of a large rotating engine became a serious handicap to manoeuvrability, and the technical problems inherent in a rotary engine were accentuated.[br]Bibliography1912, L'Aérophile 20(4) (Louis Séguin's description of the Gnome).Further ReadingC.F.Taylor, 1971, "Aircraft Propulsion", Smithsonian Annals of Flight 1(4) (an account of the evolution of aircraft piston engines).A.Nahum, 1987, the Rotary Aero-Engine, London.JDS -
9 Westinghouse, George
[br]b. 6 October 1846 Central Bridge, New York, USAd. 12 March 1914 New York, New York, USA[br]American inventor and entrepreneur, pioneer of air brakes for railways and alternating-current distribution of electricity.[br]George Westinghouse's father was an ingenious manufacturer of agricultural implements; the son, after a spell in the Union Army during the Civil War, and subsequently in the Navy as an engineer, went to work for his father. He invented a rotary steam engine, which proved impracticable; a rerailing device for railway rolling stock in 1865; and a cast-steel frog for railway points, with longer life than the cast-iron frogs then used, in 1868–9. During the same period Westinghouse, like many other inventors, was considering how best to meet the evident need for a continuous brake for trains, i.e. one by which the driver could apply the brakes on all vehicles in a train simultaneously instead of relying on brakesmen on individual vehicles. By chance he encountered a magazine article about the construction of the Mont Cenis Tunnel, with a description of the pneumatic tools invented for it, and from this it occurred to him that compressed air might be used to operate the brakes along a train.The first prototype was ready in 1869 and the Westinghouse Air Brake Company was set up to manufacture it. However, despite impressive demonstration of the brake's powers when it saved the test train from otherwise certain collision with a horse-drawn dray on a level crossing, railways were at first slow to adopt it. Then in 1872 Westinghouse added to it the triple valve, which enabled the train pipe to charge reservoirs beneath each vehicle, from which the compressed air would apply the brakes when pressure in the train pipe was reduced. This meant that the brake was now automatic: if a train became divided, the brakes on both parts would be applied. From then on, more and more American railways adopted the Westinghouse brake and the Railroad Safety Appliance Act of 1893 made air brakes compulsory in the USA. Air brakes were also adopted in most other parts of the world, although only a minority of British railway companies took them up, the remainder, with insular reluctance, preferring the less effective vacuum brake.From 1880 Westinghouse was purchasing patents relating to means of interlocking railway signals and points; he combined them with his own inventions to produce a complete signalling system. The first really practical power signalling scheme, installed in the USA by Westinghouse in 1884, was operated pneumatically, but the development of railway signalling required an awareness of the powers of electricity, and it was probably this that first led Westinghouse to become interested in electrical processes and inventions. The Westinghouse Electric Company was formed in 1886: it pioneered the use of electricity distribution systems using high-voltage single-phase alternating current, which it developed from European practice. Initially this was violently opposed by established operators of direct-current distribution systems, but eventually the use of alternating current became widespread.[br]Principal Honours and DistinctionsLégion d'honneur. Order of the Crown of Italy. Order of Leopold.BibliographyWestinghouse took out some 400 patents over forty-eight years.Further ReadingH.G.Prout, 1922, A Life of "George Westinghouse", London (biography inclined towards technicalities).F.E.Leupp, 1918, George Westinghouse: His Life and Achievements, Boston (London 1919) (biography inclined towards Westinghouse and his career).J.F.Stover, 1961, American Railroads, Chicago: University of Chicago Press, pp. 152–4.PJGR -
10 Memory
To what extent can we lump together what goes on when you try to recall: (1) your name; (2) how you kick a football; and (3) the present location of your car keys? If we use introspective evidence as a guide, the first seems an immediate automatic response. The second may require constructive internal replay prior to our being able to produce a verbal description. The third... quite likely involves complex operational responses under the control of some general strategy system. Is any unitary search process, with a single set of characteristics and inputoutput relations, likely to cover all these cases? (Reitman, 1970, p. 485)[Semantic memory] Is a mental thesaurus, organized knowledge a person possesses about words and other verbal symbols, their meanings and referents, about relations among them, and about rules, formulas, and algorithms for the manipulation of these symbols, concepts, and relations. Semantic memory does not register perceptible properties of inputs, but rather cognitive referents of input signals. (Tulving, 1972, p. 386)The mnemonic code, far from being fixed and unchangeable, is structured and restructured along with general development. Such a restructuring of the code takes place in close dependence on the schemes of intelligence. The clearest indication of this is the observation of different types of memory organisation in accordance with the age level of a child so that a longer interval of retention without any new presentation, far from causing a deterioration of memory, may actually improve it. (Piaget & Inhelder, 1973, p. 36)4) The Logic of Some Memory Theorization Is of Dubious Worth in the History of PsychologyIf a cue was effective in memory retrieval, then one could infer it was encoded; if a cue was not effective, then it was not encoded. The logic of this theorization is "heads I win, tails you lose" and is of dubious worth in the history of psychology. We might ask how long scientists will puzzle over questions with no answers. (Solso, 1974, p. 28)We have iconic, echoic, active, working, acoustic, articulatory, primary, secondary, episodic, semantic, short-term, intermediate-term, and longterm memories, and these memories contain tags, traces, images, attributes, markers, concepts, cognitive maps, natural-language mediators, kernel sentences, relational rules, nodes, associations, propositions, higher-order memory units, and features. (Eysenck, 1977, p. 4)The problem with the memory metaphor is that storage and retrieval of traces only deals [ sic] with old, previously articulated information. Memory traces can perhaps provide a basis for dealing with the "sameness" of the present experience with previous experiences, but the memory metaphor has no mechanisms for dealing with novel information. (Bransford, McCarrell, Franks & Nitsch, 1977, p. 434)7) The Results of a Hundred Years of the Psychological Study of Memory Are Somewhat DiscouragingThe results of a hundred years of the psychological study of memory are somewhat discouraging. We have established firm empirical generalisations, but most of them are so obvious that every ten-year-old knows them anyway. We have made discoveries, but they are only marginally about memory; in many cases we don't know what to do with them, and wear them out with endless experimental variations. We have an intellectually impressive group of theories, but history offers little confidence that they will provide any meaningful insight into natural behavior. (Neisser, 1978, pp. 12-13)A schema, then is a data structure for representing the generic concepts stored in memory. There are schemata representing our knowledge about all concepts; those underlying objects, situations, events, sequences of events, actions and sequences of actions. A schema contains, as part of its specification, the network of interrelations that is believed to normally hold among the constituents of the concept in question. A schema theory embodies a prototype theory of meaning. That is, inasmuch as a schema underlying a concept stored in memory corresponds to the mean ing of that concept, meanings are encoded in terms of the typical or normal situations or events that instantiate that concept. (Rumelhart, 1980, p. 34)Memory appears to be constrained by a structure, a "syntax," perhaps at quite a low level, but it is free to be variable, deviant, even erratic at a higher level....Like the information system of language, memory can be explained in part by the abstract rules which underlie it, but only in part. The rules provide a basic competence, but they do not fully determine performance. (Campbell, 1982, pp. 228, 229)When people think about the mind, they often liken it to a physical space, with memories and ideas as objects contained within that space. Thus, we speak of ideas being in the dark corners or dim recesses of our minds, and of holding ideas in mind. Ideas may be in the front or back of our minds, or they may be difficult to grasp. With respect to the processes involved in memory, we talk about storing memories, of searching or looking for lost memories, and sometimes of finding them. An examination of common parlance, therefore, suggests that there is general adherence to what might be called the spatial metaphor. The basic assumptions of this metaphor are that memories are treated as objects stored in specific locations within the mind, and the retrieval process involves a search through the mind in order to find specific memories....However, while the spatial metaphor has shown extraordinary longevity, there have been some interesting changes over time in the precise form of analogy used. In particular, technological advances have influenced theoretical conceptualisations.... The original Greek analogies were based on wax tablets and aviaries; these were superseded by analogies involving switchboards, gramophones, tape recorders, libraries, conveyor belts, and underground maps. Most recently, the workings of human memory have been compared to computer functioning... and it has been suggested that the various memory stores found in computers have their counterparts in the human memory system. (Eysenck, 1984, pp. 79-80)Primary memory [as proposed by William James] relates to information that remains in consciousness after it has been perceived, and thus forms part of the psychological present, whereas secondary memory contains information about events that have left consciousness, and are therefore part of the psychological past. (Eysenck, 1984, p. 86)Once psychologists began to study long-term memory per se, they realized it may be divided into two main categories.... Semantic memories have to do with our general knowledge about the working of the world. We know what cars do, what stoves do, what the laws of gravity are, and so on. Episodic memories are largely events that took place at a time and place in our personal history. Remembering specific events about our own actions, about our family, and about our individual past falls into this category. With amnesia or in aging, what dims... is our personal episodic memories, save for those that are especially dear or painful to us. Our knowledge of how the world works remains pretty much intact. (Gazzaniga, 1988, p. 42)The nature of memory... provides a natural starting point for an analysis of thinking. Memory is the repository of many of the beliefs and representations that enter into thinking, and the retrievability of these representations can limit the quality of our thought. (Smith, 1990, p. 1)Historical dictionary of quotations in cognitive science > Memory
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