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Lotnummer: 743
GENOVA. Titolo de 250 Lire. Serie 17. green, black. Formed Genova, 1855, to exploit the Italian rights to the regenerative energy system developed by the Siemens brothers. The regenerator (a device invented twenty years before) was not developed until William Siemens applied it to the steam-engine in the form of a regenerative condenser with some success. This was in 1847, and in 1855 engines constructed on Siemens's plan were worked at the Paris exhibition. Later he made many attempts to apply the regenerator to internal-combustion or gas engines ;but neither in steam-engines nor in gas-engines were his inventions directly and permanently fruitful, though the direction they followed was that in which improvement ws still sought after. The regenerative principle, however, as a means of saving heat soon received another and far wider application. In 1856 he introduced the regenerative furnace. In an ordinary furnace a very large part of the heat of combustion is lost by being carried off in the hot gases which pass up the chimney. In the regenerative furnace the hot gases pass through a regenerator, or chamber stacked with loose bricks, which absorb the heat. When the bricks are well heated the hot gases are diverted so to pass through another similar chamber, while theair necessary for combustion, before it enters the furnace, is made to traverse the heated chamber, taking up as it goes the heat which has been stored in the bricks. After a suitable interval the air currents are again reversed. The process is repeated periodically, with the result that the products of combustion escape only after being cooled, the heat which they take from the furnace being in great part carried back in the heated air. It was soon applied to many industrial processes, but it found its greatest development a few years later at the hands of Siemens himself in the manufacture of steel. To produce steel directly from the ore, or by melting together wrought-iron scrap with cast-iron upon the open hearth, had been in his mind from the first, but it was not till 1867, after two years of experiment in "sample steel works" erected by himself for the purpose, that he achieved success.
Datum: 26 September 1855
Kwaliteit: EF
Startprijs: € 200