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 possible speed, quantities of all the sorts of bar-iron made by him, fit for the "making of muskets, carbines, and iron for great bolts for shipping; which iron," continues Dud, "being so tried by artists and smiths, the ironmasters and iron-mongers were all silenced until the 21st year of King James's reign." The ironmasters then endeavoured to get the Dudley patent included in the monopolies to be abolished by the statute of that year; but all they could accomplish was the limitation of the patent to fourteen years instead of thirty-one; the special exemption of the patent from the operation of the statute affording a sufficient indication of the importance already attached to the invention. After that time Dudley "went on with his invention cheerfully, and made annually great store of iron, good and merchantable, and sold it unto diverse men at twelve pounds per ton." "I also," said he, "made all sorts of cast-iron wares, as brewing cisterns, pots, mortars, &c., better and cheaper than any yet made in these nations with charcoal, some of which are yet to be seen by any man (at the author's house in the city of Worcester) that desires to be satisfied of the truth of the invention."