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121 Sickels, Frederick Ellsworth
[br]b. 20 September 1819 Gloucester County, New Jersey, USAd. 8 March 1895 Kansas City, Missouri, USA[br]American inventor of a steam-inlet cut-off valve mechanism for engines and steam steering apparatus for ships.[br]Sickels was educated in New York City, where his father was a practising physician. As he showed mechanical aptitude, at the age of 16 he joined the Harlem Railroad as a rod man, and a year later became a machinist in the Allaire Works in New York, studying physics and mechanics in his spare time. He perfected his cut-off mechanism for drop valves in 1841 and patented it the following year. The liberating mechanism allowed the valve to fall quickly onto its seat and so eliminated "wire-drawing" of the steam, and Sickels arranged a dashpot to prevent the valve hitting the seat violently. Through further improvements patented in 1843 and 1845, he gained a considerable fortune, but he subsequently lost it through fighting patent infringements because his valve gear was copied extensively.In 1846 he turned his attention to using a steam engine to assist the steering in ships. He filed a patent application in 1849 and completed a machine in 1854, but he could not find any ship owner willing to try it until 1858, when it was fitted to the August. A patent was granted in 1860, but as no American ship owners showed interest Sickels went to England, where he obtained three British patents; once again, however, he found no interest. He returned to the United States in 1867 and continued his fruitless efforts until he was financially ruined. He patented improved compound engines in 1875 and also contributed improvements in sinking pneumatic piles. He turned to civil engineering and engaged in railway and bridge construction in the west. In about 1890 he was made Consulting Engineer to the National Water Works Company of New York and in 1891 became Chief Engineer of its operations at Kansas City.[br]Further ReadingDictionary of American Biography, 1935, Vol. XVII, New York: C.Scribner's Sons. C.T.Porter, 1908, Engineering Reminiscences, reprinted 1985, Bradley, Ill.: Lindsay Publications (comments on his cut-off valve gear).H.G.Conway, 1955–6, "Some notes on the origins of mechanical servo systems", Transactions of the Newcomen Society 29 (comments on his steam steering apparatus).RLHBiographical history of technology > Sickels, Frederick Ellsworth
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122 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 -
123 خط
خَطّ \ band: a line of material that is different from the rest, esp. in colour: A red band was painted round the tin. line: a long thin mark: a pencil line; the white lines on a football field. streak: an irregular thin strip of colour: streaks of red cloud at sunset. stripe: a long narrow band of colour: a flag with green, yellow and blue stripes. trail: a track left by sb. or sth.: The storm left a trail of destruction. The police were on his trail (were following signs, in search of him). \ See Also شريط (شَرِيط)، أَثَر \ خَطّ \ graph: a line drawn on squared paper, to show the change in amount at different times or under different conditions: He drew a graph of the monthly rainfall. \ See Also رَسْم بَيَانِيّ \ خَطّ الاسْتِواء \ equator: an imaginary line around the earth, halfway between its most northern and southern points. \ خَطّ أنابِيب \ pipeline: a large pipe through which liquid or gas is carried for long distances (esp. oil from an oilfield to a port). \ خَطّ قَضيب سِكّة الحديد \ railway, railroad: a track along which trains run: The road crosses the railway (line) by a bridge. \ خَطّ كتَابة باليَد \ handwriting: sb.’s way of writing: I can’t read your handwriting. \ خَطّ مَجْرى التَّفْكير \ line: the course of an idea: a line of thought. \ خَطّ حَديدي جانِبِيّ \ siding: a short piece of railway track beside a main line (for loading goods, etc.). \ خَطّ السَّاحِل \ coastline: a line following the shape of the coast, esp. as seen from the sea. \ خَطّ سَفَر جَوِّي \ airline: air transport system for public use. \ خَطّ سِكَّة الحَديد \ line: a railway track: the main line to London; a branch line. \ خَطّ السَّمْت \ meridian: an imaginary line drawn from the top point of the earth to the bottom, used on maps to show position. \ خَطّ سَيْر \ line: a course; a direction: One road follows the line of the river; the other follows the coastline. path: the line along which sth. moves: the moon’s path round the earth. route: the way that one takes from one place to another: Which is the safest route up the mountain?. \ See Also طريق (طَرِيق) \ خَطّ الطُّول \ longitude: one of a set of imaginary lines round the world that are drawn on maps to show how far east or west sth. is (see latitude). \ خَطّ العَرْض \ latitude: one of a set of imaginary lines round the world that are usual on maps to show how far north or south sth. is (see longitude): In northern latitudes, daylight lasts for 20 hours in the summer. parallel: an imaginary line on a map, for describing the position of anything (see latitude): The 49th parallel (of latitude) forms a border between Canada and the USA. \ خَطّ القِتال \ line: (in war) a row of defended positions: in the front line; behind the enemy lines. \ خَطّ قَصير (عَلامَة وَصْل) (شَرْطَة قصيرة) \ hyphen: (-) that is used for joining two words, as in: blood-red. \ خَطّ قُطْري \ diagonal: (in the direction of) a straight line joining two opposite corners of a square; (of) any straight line which runs in a sloping direction: a cloth with a diagonal pattern. \ خَطّ اليَد \ script: handwriting, not printing. \ خَطّ الدَّرْز \ seam: the line where two edges of cloth or leather meet (and are sewn or stuck together): the seam of one’s trouser leg. \ خَطّ حُدود مَلْعَب (الكُرَة) \ touchline: the line down each side of a football field. \ خُطوطٌ رئيسيَّة \ outline: a statement of the main facts: an outline of English history. \ خَطَأٌ \ amiss: wrong; out of order: There’s something amiss with this telephone. error: mistake. fault: sth. that is wrong; a weakness: The lights have gone out; there must be an electrical fault. mistake: an incorrect act or thought: It was a mistake to lend him money. Your English is full of mistakes. wrong: not right; unjust; against custom; against the law: It is wrong to tell lies or to steal, not correct; mistaken; unsuitable That’s the wrong answer, and the wrong way to do it. She came in the wrong clothes for riding, (a) wrong action, a crime; an injustice If you do no wrong, you will not be punished. \ أَخْطَاء (أَغلاطٌ كِتابيَّة أو مَطبعيَّة) \ errata. -
124 قضيب
قَضِيب \ bar: a long stiff piece of hard material (iron, wood, soap, etc). penis: the male sexual organ. rod: a thin round bar or pole: a curtain rod; a fishing rod. stick: a thin branch from a tree of bush: sticks to make a fire; a walking stick. \ See Also عصا (عَصًا) \ قَضِيب \ railway: railroad, a track along which trains run: The road crosses the railway (line) by a bridge. \ See Also خَطّ سِكّة الحديد \ قَضِيب سِكّة الحديد \ rail: one of the two steel lines that a train’s wheels run on. \ قَضِيب مُعْتَرِض \ crossbar: the bar across two posts, for football, jumping over, etc.. rail: a bar of wood or metal that joins upright posts (of a fence, as a support for climbing stairs, etc.). \ قَضِيب مَعْدِنيّ مُدَبَّب الرَّأس \ spike: a sharp metal point: a row of spikes along the top of the prison wall. -
125 railway
قَضِيب \ railway: railroad, a track along which trains run: The road crosses the railway (line) by a bridge. \ See Also خَطّ سِكّة الحديد
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