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John Ericsson (July 31, 1803 – March 8, 1889) was a Swedish-American inventor, active in England and the United States, and regarded as one of the most influential mechanical engineers ever. Ericsson collaborated on the design of the steam locomotive Novelty, which competed in the Rainhill Trials on the Liverpool and Manchester Railway, won by George Stephenson’s Rocket. In America he designed the US Navy's first screw-propelled steam-frigate USS ''Princeton'', in partnership with Captain Robert Stockton, who unjustly blamed him for the fatal accident at its speed trials. A new partnership with Cornelius H. DeLamater of the DeLamater Iron Works in New York resulted in the first armoured ship with a rotating turret, the USS ''Monitor'', which dramatically saved the US naval blockading squadron from destruction by an ironclad Confederate vessel, CSS ''Virginia'', at Hampton Roads in March 1862. He was the brother of Nils Ericson, a distinguished canal and railway builder in Sweden. ==Early career== John's and Nils's father Olaf Ericsson who worked as the supervisor for a mine in Värmland had lost money in speculations and had to move his family from Värmland to Forsvik in 1810. There he worked as a director of blastings' during the excavation of the Swedish Göta Canal. The extraordinary skills of the two brothers were discovered by Baltzar von Platen, the architect of the Göta Canal. The two brothers were dubbed cadets of mechanics of the Swedish Royal Navy and engaged as trainees at the canal enterprise. At the age of fourteen, John was already working independently as a surveyor. His assistant had to carry a footstool for him to reach the instruments during surveying work. At the age of seventeen he joined the Swedish army in Jämtland, serving in the Jämtland Field Ranger Regiment, as a Second Lieutenant, but was soon promoted to Lieutenant. He was sent to northern Sweden to do surveying, and in his spare time he constructed a heat engine which used the fumes from the fire instead of steam as a propellant. His skill and interest in mechanics made him resign from the army and move to England in 1826. However his heat engine was not a success, as his prototype was designed to burn birchwood and would not work well with coal (the main fuel used in England). Notwithstanding the disappointment, he invented several other mechanisms instead based on steam, improving the heating process by adding fans to increase oxygen supply to the fire bed. In 1829 he and John Braithwaite built "Novelty" for the Rainhill Trials arranged by the Liverpool and Manchester Railway. It proved considerably faster than the other entrants but suffered recurring boiler problems, and the competition was won by English engineers George and Robert Stephenson with ''Rocket''. Two further engines were built by Braithwaite and Ericsson, named ''William IV'' and ''Queen Adelaide'' after the new king and queen. These were generally larger and more robust than ''Novelty'' and differed in several details (for example it is thought that a different design of blower was used which was an 'Induced Draught' type, sucking the gases from the fire). The pair ran trials on the Liverpool and Manchester Railway but the railway declined to purchase the new designs. Their innovative steam fire engine proved an outstanding technical success by helping to quell the memorable Argyll Rooms fire〔http://www.british-steam-fire-engines.org/John_Ericsson.html 〕 on February 5, 1830〔(【引用サイトリンク】title=Survey of London: volumes 31 and 32: St James Westminster, Part 2 (1963, Ch.XIX) )〕 (where it worked for five hours when the other engines were frozen up),〔(【引用サイトリンク】title=The Life Of John Ericsson Volume I )〕 but was met with resistance from London's established 'Fire Laddies' and municipal authorities. An engine Ericsson constructed for Sir John Franklin's use failed under the Antarctic conditions for which, out of Franklin's desire to conceal his destination, it had not been designed. At this stage of Ercisson's career the most successful and enduring of his inventions was the steam condenser, which allowed a steamer to produce fresh water for its boilers while at sea. His 'deep sea lead,' a pressure-activated fathometer was another minor, but enduring success. The commercial failure and development costs of some of the machines devised and built by Ericsson during this period put him into debtors' prison for an interval. At this time he also married 19-year-old Amelia Byam, a disastrous match that ended in the couple's separation until Amelia's death. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「John Ericsson」の詳細全文を読む スポンサード リンク
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