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MANUFACTURE OF IRON. THE HOT BLAST. Having expressed an opinion in a former paper, that information was much wanted in England as to the effect of the hot blast, now generally in use in Scot- land, on the quality of the manufactured iron, a cor- respondent obligingly directed our attention to the articles 'Glasgow1 and' Iron making,' in the new edition of the Encyclopedia Britannica. NVe are not sorry to have a test suggested by which we might ascertain whether the editor of that work was active in securing the latest and best information relating to the state of trie arts and manufactures of the country, and the result has been g-rcativ in his favour. In the former article Dr. Cleiaud o,)serves :riie air, at first raised to 250 of Fahrenheit, produced a saving of three-sevenths in evei, v ton of pig-iron made, and the heating apparatus having since been enlarged so as to increase the temperature of the blast to 600 of Fah- renheit and upwards, a proportionate saving of fuel is effected, and an immense additional saving is also acquired by the use of raw coal instead of coke, which may now be adopted by thus increasing the heat of the blast, the whole waste incurred in burning the coal into coke being thus also avoided in the pro- cess of iron making. By the use of this invention, with three-sevenths of the fuel which he formerly em- ployed in the cold air process, the iron-maker is now en- abled to make one-third more iron of a superior quality. Were the hot blast generally adopted, tne saving to the country would be immense. In Britain about 70;),000 tons of iron is made annually, of which 55,500 tons oniy are produced in Scotland. On these 55,500 tons, his invention would save, in the process of manu- facture 222,01)0 tons of coal annually. In England, the saving would be in proportion to tiie strength and quality of the coal, and cannot be computed at less than 1,320,080 tons annually and taking the price of coals at the Jow rate of 4s. per ton, a yearly saving of <S £ '3J8,100. sterling would be affected." The writer of the artiele 4 Iron-making' published in the last number of the Encyclopedia, speaks less confi- dently as to its effects on the quality of the iron: "Whether the metal produced bv the' hot blast be equal to that made in the usual way, admits of some doubt. The general opinion seems to be, that the iron is weaker, both in the pig and in the wrought bar." But he proceeds to observe :—There appears to be no possible reason why this should be the case, provided that coke only be employed in the blast- furnace. If the coal be used in a raw state, as it most commonly is, when he furnace is blown by hot air, then tuere certainly is room for suspicion, that deleterious substances may come in contact witli the iron, which, had tue coal1 been coked, would, during that operation have been in great part if not wholly reiiioved.-Fro),it tlte At hence wn.




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