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1 brooklyn köprüsü
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2 Roebling, John Augustus
SUBJECT AREA: Civil engineering[br]b. 12 July 1806 Muhlhausen, Prussiad. 22 July 1869 Brooklyn, New York, USA[br]German/American bridge engineer and builder.[br]The son of Polycarp Roebling, a tobacconist, he studied mathematics at Dr Unger's Pedagogium in Erfurt and went on to the Royal Polytechnic Institute in Berlin, from which he graduated in 1826 with honours in civil engineering. He spent the next three years working for the Prussian government on the construction of roads and bridges. With his brother and a group of friends, he emigrated to the United States, sailing from Bremen on 23 May 1831 and docking in Philadelphia eleven weeks later. They bought 7,000 acres (2,800 hectares) in Butler County, western Pennsylvania, and established a village, at first called Germania but later known as Saxonburg. Roebling gave up trying to establish himself as a farmer and found work for the state of Pennsylvania as Assistant Engineer on the Beaver River canal and others, then surveying a railroad route across the Allegheny Mountains. During his canal work, he noted the failings of the hemp ropes that were in use at that time, and recalled having read of wire ropes in a German journal; he built a rope-walk at his Saxonburg farm, bought a supply of iron wire and trained local labour in the method of wire twisting.At this time, many canals crossed rivers by means of aqueducts. In 1844, the Pennsylvania Canal aqueduct across the Allegheny River was due to be renewed, having become unsafe. Roebling made proposals which were accepted by the canal company: seven wooden spans of 162 ft (49 m) each were supported on either side by a 7 in. (18 cm) diameter cable, Roebling himself having to devise all the machinery required for the erection. He subsequently built four more suspension aqueducts, one of which was converted to a toll bridge and was still in use a century later.In 1849 he moved to Trenton, New Jersey, where he set up a new wire rope plant. In 1851 he started the construction (completed in 1855) of an 821 ft (250 m) long suspension railroad bridge across the Niagara River, 245 ft (75 m) above the rapids; each cable consisted of 3,640 wrought iron wires. A lower deck carried road traffic. He also constructed a bridge across the Ohio River between Cincinnati and Covington, a task which was much protracted due to the Civil War; this bridge was finally completed in 1866.Roebling's crowning achievement was to have been the design and construction of the bridge over the Hudson River between Brooklyn and Staten Island, New York, but he did not live to see its completion. It had a span of 1,595 ft (486 m), designed to bear a load of 18,700 tons (19,000 tonnes) with a headroom of 135 ft (41 m). The work of building had barely started when, at the Brooklyn wharf, a boat crushed Roebling's foot against the timbering and he died of tetanus three weeks later. His son, Washington Augustus Roebling, then took charge of this great work.[br]Further ReadingD.B.Steinman and S.R.Watson, 1941, Bridges and their Builders, New York: Dover Books.D.McCullough, 1982, The Great Bridge: The Epic Story of the Building of the Brooklyn Bridge, New York: Simon \& Schuster.IMcNBiographical history of technology > Roebling, John Augustus
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3 Roebling, Washington Augustus
SUBJECT AREA: Civil engineering[br]b. 26 May 1837 Saxonburg, Pennsylvania, USAd. 21 July 1926 Trenton, New Jersey, USA.[br]American civil engineer.[br]The son of John Augustus Roebling, he graduated in 1857 from the Rensselaer Polytechnic Institute as a civil engineer, and joined his father in his suspension bridge construction work. He served in the Civil War as a colonel of engineers in the Union Army, and in 1867, two years after the end of the war, he went to Europe to study new methods of sinking underwater foundations by means of compressed air. These new methods were employed in the construction of the Brooklyn Bridge, of which he took charge on his father's death in 1869. Timber pneumatic caissons were used, with a maximum pressure of 34 psi (2.4 kg/cm2) above atmospheric pressure. Two years after work on the piers had started in the caissons, Roebling, who had been working constantly with the men on the foundations of the piers, was carried unconscious out of the caisson, a victim of decompression sickness, then known as “caisson disease”. He was paralysed and lost the use of his voice. From then on he directed the rest of the work from the sickroom of his nearby house, his wife, Emily Warren Roebling, helping with his instructions and notes and carrying them out to the workforce; she even read a statement from him to the American Society of Civil Engineers. The erection of the cables, which were of steel, began in August 1876 and took twenty-six months to complete. In 1881 eleven trustees and Emily Warren Roebling walked across temporary planking, but the decking of the total span was not completed until 1885, fourteen years after construction of the bridge had started. The Brooklyn Bridge was Roebling's last major work, although following the death of his nephew in 1921 he was forced to head again the management of Roebling \& Company, though aged 84 and an invalid.[br]Further ReadingD.B.Steinman and S.R.Watson, 1941, Bridges and their Builders, New York: Dover Books.D.McCullough, 1982, The Great Bridge: The Epic Story of the Building of the BrooklynBridge, New York: Simon \& Schuster.IMcNBiographical history of technology > Roebling, Washington Augustus
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4 Бруклинский мост
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5 Sellers, William
SUBJECT AREA: Mechanical, pneumatic and hydraulic engineering[br]b. 19 September 1824 Upper Darby, Pennsylvania, USAd. 24 January 1905 Philadelphia, Pennsylvania, USA[br]American mechanical engineer and inventor.[br]William Sellers was educated at a private school that had been established by his father and other relatives for their children, and at the age of 14 he was apprenticed for seven years to the machinist's trade with his uncle. At the end of his apprenticeship in 1845 he took charge of the machine shop of Fairbanks, Bancroft \& Co. in Providence, Rhode Island. In 1848 he established his own factory manufacturing machine tools and mill gearing in Philadelphia, where he was soon joined by Edward Bancroft, the firm becoming Bancroft \& Sellers. After Bancroft's death the name was changed in 1856 to William Sellers \& Co. and Sellers served as President until the end of his life. His machine tools were characterized by their robust construction and absence of decorative embellishments. In 1868 he formed the Edgemoor Iron Company, of which he was President. This company supplied the structural ironwork for the Centennial Exhibition buildings and much of the material for the Brooklyn Bridge. In 1873 he reorganized the William Butcher Steel Works, renaming it the Midvale Steel Company, and under his presidency it became a leader in the production of heavy ordnance. It was at the Midvale Steel Company that Frederick W. Taylor began, with the encouragement of Sellers, his experiments on cutting tools.In 1860 Sellers obtained the American rights of the patent for the Giffard injector for feeding steam boilers. He later invented his own improvements to the injector, which numbered among his many other patents, most of which related to machine tools. Probably Sellers's most important contribution to the engineering industry was his proposal for a system of screw threads made in 1864 and later adopted as the American national standard.Sellers was a founder member in 1880 of the American Society of Mechanical Engineers and was also a member of many other learned societies in America and other countries, including, in Britain, the Institution of Mechanical Engineers and the Iron and Steel Institute.[br]Principal Honours and DistinctionsChevalier de la Légion d'honneur 1889. President, Franklin Institute 1864–7.Further ReadingJ.W.Roe, 1916, English and American Tool Builders, New Haven; reprinted 1926, New York, and 1987, Bradley, Ill. (describes Sellers's work on machine tools).Bruce Sinclair, 1969, "At the turn of a screw: William Sellers, the Franklin Institute, and a standard American thread", Technology and Culture 10:20–34 (describes his work on screw threads).RTS
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