Although the manufacture had now become fairly naturalized in England, it was restricted by our ignorance of the first process to which the silk was subjected. Up till 1718, the whole of the silk used in England, for whatever purpose, was imported "thrown," that is, formed into threads of various kinds and twists. A young Englishman named John Lombe, impressed with the idea that our dependence on other countries for a supply of thrown silk prevented us from reaping the full benefit of the manufacture, and from competing with foreign traders, conceived the project of visiting Italy, and discovering the secret of the operation. He accordingly went over to Piedmont in 1715, but found the difficulties greater than he had anticipated. He applied for admittance at several factories, but was told that an examination of the machinery was strictly prohibited. Not to be balked, he resolved, as a last resort, to try if he could accomplish by stratagem what he had failed to do openly. Disguising himself in the dress of a common labourer, he bribed a couple of the workmen connected with one of the factories, and with their connivance obtained access in secret to the works. His visits were few and short; but he made the best use of his time. He carefully examined the various parts of the machinery, ascertained the principle of its operation, and made himself completely master of the whole process of throwing. Each night before he went to bed he noted down everything he had seen, and drew sketches of parts of the machinery. This plot, however, was discovered by the Italians. He and his accomplices had to fly for their lives, and not without great difficulty escaped to a ship which conveyed them to England. Lombe had not forgotten to carry off with him his note-book, sketches, and a chest full of machinery, and on his return home lost no time in practising the art of "throwing" silk. On a swampy island in the river Derwent, at Derby, he built a magnificent mill, yet standing, called the "Old Silk Mill." Its erection occupied four years, and cost L30,000. It was five storeys in height, and an eighth of a mile in length. The grand machine numbered no fewer than 13,384 wheels. It was said that it could produce 318,504,960 yards of organzine silk thread daily; but the estimate is no doubt exaggerated. While the mill was building, Lombe, in order to save time and earn money to carry on the works, opened a manufactory in the Town Hall of Derby. His machinery more than fulfilled his expectations, and enabled him to sell thrown silk at much lower prices than were charged by the Italians. A thriving trade was thus established, and England relieved from all dependence on other countries for "thrown" silk.