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Updated: May 21, 2025
As in the case of other inventions, Cort took up the manufacture of iron at the point to which his predecessors had brought it, carrying it still further, and improving upon their processes. We may here briefly recite the steps by which the manufacture of bar-iron by means of pit-coal had up to this time been advanced. In 1747, Mr.
Roebuck was indefatigable in his endeavours to improve the manufacture, and he was one of the first, as we have said, to revive the use of pit-coal in refining the ore, as appears from his patent of 1762.
From thence he removed to Himley in the county of Stafford, where he set up a pit-coal furnace; but being without the means of forging the iron into bars, he was constrained to sell the pig-iron to the charcoal-ironmasters, "who did him much prejudice, not only by detaining his stock, but also by disparaging his iron."
But the same popular prejudice which existed against the use of coal for domestic purposes, prevented its being employed for purposes of manufacture; and they were thought very foolish persons indeed who first promulgated the idea of smelting iron by means of pit-coal. The old manufacturers held it to be impossible to reduce the ore in any other way than by means of charcoal of wood.
Mushet, "soon gave rise to the Gartsherrie and Dundyvan furnaces, in the midst of which progress came the use of raw pit-coal and the Hot Blast the latter one of the greatest discoveries in metallurgy of the present age, and, above every other process, admirably adapted for smelting the Blackband ironstone."
It was thus that he invented the process of smelting iron by means of pit-coal which he afterwards embodied in the patent hereafter to be referred to. At the same time he invented new methods of refining gold and silver, and of employing them in the arts, which proved of great practical value to the Birmingham trades-men, who made extensive use of them in their various processes of manufacture.
As for Dudley's Metallum Martis, as it contained no specification, it revealed no secret; and when its author died, his secret, whatever it might be, died with him. Other improvements were doubtless necessary before the invention could be turned to useful account. Thus, until a more powerful blowing-furnace had been contrived, the production of pit-coal iron must necessarily have been limited.
"Having former knowledge and delight in ironworks of my father's when I was but a youth, afterwards, at twenty years old, was I fetched from Oxford, then of Baliol College, anno 1619, to look after and manage three ironworks of my father's, one furnace and two forges in the chace of Pensnel, in Worcestershire; but wood and charcoal growing very scanty, and pit-coals in great quantities abounding near the furnace, did induce me to alter my furnace and to attempt by my new invention, the making of iron with pit-coal, and found at my trial or blast, facere est addere inventioni.
This furnace was of stone, twenty-seven feet square, provided with unusually large bellows; and when in full work he says he was enabled to turn out seven tons of iron per week, "the greatest quantity of pit-coal iron ever yet made in Great Britain."
These forges, he adds, "have barred all or most part of their iron with pit-coal since the authors first invention In 1618, which hath preserved much wood. From that time forward, Dud becomes lost to sight. He seems eventually to have retired to St. Helen's in Worcestershire, where he died in 1684, in the 85th year of his age.
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