Industrial Biography: Iron Workers and Tool Makers. Samuel SmilesЧитать онлайн книгу.
under which he undertook to describe his "Ignick Invention" All the operations of industry were then treated as secrets. Each trade was a craft, and those who followed it were called craftsmen. Even the common carpenter was a handicraftsman; and skilled artisans were "cunning men." But the higher branches of work were mysteries, the communication of which to others was carefully guarded by the regulations of the trades guilds. Although the early patents are called specifications, they in reality specify nothing. They are for the most part but a mere haze of words, from which very little definite information can be gleaned as to the processes patented. It may be that Sturtevant had not yet reduced his idea to any practicable method, and therefore could not definitely explain it. However that may be, it is certain that his process failed when tried on a large scale, and Sturtevant's patent was accordingly cancelled at the end of a year.
The idea, however, had been fairly born, and repeated patents were taken out with the same object from time to time. Thus, immediately on Sturtevant's failure becoming known, one John Rovenzon, who had been mixed up with the other's adventure, applied for a patent for making iron by the same process, which was granted him in 1613. His 'Treatise of Metallica'[3] shows that Rovenzon had a true conception of the method of manufacture. Nevertheless he, too, failed in carrying out the invention in practice, and his patent was also cancelled. Though these failures were very discouraging, like experiments continued to be made and patents taken out,—principally by Dutchmen and Germans,[4]—but no decided success seems to have attended their efforts until the year 1620, when Lord Dudley took out his patent "for melting iron ore, making bar-iron, &c., with coal, in furnaces, with bellows." This patent was taken out at the instance of his son Dud Dudley, whose story we gather partly from his treatise entitled 'Metallum Martis,' and partly from various petitions presented by him to the king, which are preserved in the State Paper Office, and it runs as follows:—
Dud Dudley was born in 1599, the natural son of Edward Lord Dudley of Dudley Castle in the county of Worcester. He was the fourth of eleven children by the same mother, who is described in the pedigree of the family given in the Herald's visitation of the county of Stafford in the year 1663, signed by Dud Dudley himself, as "Elizabeth, daughter of William Tomlinson of Dudley, concubine of Edward Lord Dudley." Dud's eldest brother is described in the same pedigree as Robert Dudley, Squire, of Netherton Hall; and as his sisters mostly married well, several of them county gentlemen, it is obvious that the family, notwithstanding that the children were born out of wedlock, held a good position in their neighbourhood, and were regarded with respect. Lord Dudley, though married and having legitimate heirs at the time, seems to have attended to the up-bringing of his natural children; educating them carefully, and afterwards employing them in confidential offices connected with the management of his extensive property. Dud describes himself as taking great delight, when a youth, in his father's iron-works near Dudley, where he obtained considerable knowledge of the various processes of the manufacture.
The town of Dudley was already a centre of the iron manufacture, though chiefly of small wares, such as nails, horse-shoes, keys, locks, and common agricultural tools; and it was estimated that there were about 20,000 smiths and workers in iron of various kinds living within a circuit of ten miles of Dudley Castle. But, as in the southern counties, the production of iron had suffered great diminution from the want of fuel in the district, though formerly a mighty woodland country; and many important branches of the local trade were brought almost to a stand-still. Yet there was an extraordinary abundance of coal to be met with in the neighbourhood—coal in some places lying in seams ten feet thick—ironstone four feet thick immediately under the coal, with limestone conveniently adjacent to both. The conjunction seemed almost providential—"as if," observes Dud, "God had decreed the time when and how these smiths should be supplied, and this island also, with iron, and most especially that this cole and ironstone should give the first and just occasion for the invention of smelting iron with pit-cole;" though, as we have already seen, all attempts heretofore made with that object had practically failed.
Dud was a special favourite of the Earl his father, who encouraged his speculations with reference to the improvement of the iron manufacture, and gave him an education calculated to enable him to turn his excellent practical abilities to account. He was studying at Baliol College, Oxford, in the year 1619, when the Earl sent for him to take charge of an iron furnace and two forges in the chase of Pensnet in Worcestershire. He was no sooner installed manager of the works, than, feeling hampered by the want of wood for fuel, his attention was directed to the employment of pit-coal as a substitute. He altered his furnace accordingly, so as to adapt it to the new process, and the result of the first trial was such as to induce him to persevere. It is nowhere stated in Dud Dudley's Treatise what was the precise nature of the method adopted by him; but it is most probable that, in endeavouring to substitute coal for wood as fuel, he would subject the coal to a process similar to that of charcoal-burning. The result would be what is called Coke; and as Dudley informs us that he followed up his first experiment with a second blast, by means of which he was enabled to produce good marketable iron, the presumption is that his success was also due to an improvement of the blast which he contrived for the purpose of keeping up the active combustion of the fuel. Though the quantity produced by the new process was comparatively small—not more than three tons a week from each furnace—Dudley anticipated that greater experience would enable him to increase the quantity; and at all events he had succeeded in proving the practicability of smelting iron with fuel made from pit-coal, which so many before him had tried in vain.
Immediately after the second trial had been made with such good issue, Dud wrote to his father the Earl, then in London, informing him what he had done, and desiring him at once to obtain a patent for the invention from King James. This was readily granted, and the patent (No. 18), dated the 22nd February, 1620, was taken out in the name of Lord Dudley himself.
Dud proceeded with the manufacture of iron at Pensnet, and also at Cradley in Staffordshire, where he erected another furnace; and a year after the patent was granted he was enabled to send up to the Tower, by the King's command, a considerable quantity of the new iron for trial. Many experiments were made with it: its qualities were fairly tested, and it was pronounced "good merchantable iron." Dud adds, in his Treatise, that his brother-in-law, Richard Parkshouse, of Sedgeley,[5] "had a fowling-gun there made of the Pit-cole iron," which was "well approved." There was therefore every prospect of the new method of manufacture becoming fairly established, and with greater experience further improvements might with confidence be anticipated, when a succession of calamities occurred to the inventor which involved him in difficulties and put an effectual stop to the progress of his enterprise.
The new works had been in successful operation little more than a year, when a flood, long after known as the "Great May-day Flood," swept away Dudley's principal works at Cradley, and otherwise inflicted much damage throughout the district. "At the market town called Stourbridge," says Dud, in the course of his curious narrative, "although the author sent with speed to preserve the people from drowning, and one resolute man was carried from the bridge there in the day-time, the nether part of the town was so deep in water that the people had much ado to preserve their lives in the uppermost rooms of their houses." Dudley himself received very little sympathy for his losses. On the contrary, the iron-smelters of the district rejoiced exceedingly at the destruction of his works by the flood. They had seen him making good iron by his new patent process, and selling it cheaper than they could afford to do. They accordingly put in circulation all manner of disparaging reports about his iron. It was bad iron, not fit to be used; indeed no iron, except what was smelted with charcoal of wood, could be good. To smelt it with coal was a dangerous innovation, and could only result in some great public calamity. The ironmasters even appealed to King James to put a stop to Dud's manufacture, alleging that his iron was not merchantable. And then came the great flood, which swept away his works; the hostile ironmasters now hoping that there was an end for ever of Dudley's pit-coal iron.
But Dud, with his wonted energy, forthwith set to work and repaired his furnaces and forges, though at great cost; and in the course of a short time the new manufacture was again in full progress. The ironmasters raised a fresh outcry against him, and addressed another strong memorial against Dud and his iron to King James. This seems to have taken effect; and in order to ascertain the quality of the article by testing it upon a large scale, the King commanded Dudley to send up to the Tower of London, with every