In addition to the extensions required from time to time at Denby to provide for these continual augmentations arising from the closing of the smaller works, the business has so extended as to necessitate considerable additions and improvements. Excellent machinery has been applied to the blunging and other processes, and instead of the old process of getting rid of the water from the slip by evaporation, the clay is obtained therefrom by the patented process invented by Messrs. Needham and Kite, Vauxhall, London, ten of their presses being employed, turning out at least 25 tons per day of workable clay. The class of ware produced has not varied to any extent, though an advance in shape and quality is evident from a comparison with some of the earlier specimens extant. The great bulk of the stoneware produced by Messrs. Bourne and Son is the kind known as the salt-glazed stoneware, which, on account of its peculiar vitreous and non-absorbent qualities, is in great demand not only in the home market, but in all parts of the world. About the year 1836 a considerable change was made in the size and form of the salt-glazed kilns, and for these improvements Mr. Joseph Bourne obtained a patent. The old kilns were only half the height of the present ones, and had each five chimneys. To these, what may be called an upper storey has been added, and, while the lower half is fired by mouths opening into the kiln and the flame passing _perpendicularly up the kiln_, the upper portion is fed by fires passing out of the kiln by means of _flues at the side_, and the modern kilns have only one chimney, thus securing a better consumption of smoke and lessening the objectionable results which would follow from such a dense volume of smoke proceeding from a low chimney. Since this patent was taken out an additional improvement has been made by the erection on the top of each kiln of a separate small oven, in which biscuit or terra-cotta fancy articles can be burnt, these being simply burnt by the heat passing up the chimney and from the top of the kiln, but no flame or salt-glaze reaching the goods. Much thought and care as well as considerable expense have been expended during the last twenty years to perfect the manufacture of telegraph insulators, and the very large business transactions in this department proves that the enterprise of the firm has not been fruitless. Messrs. Bourne and Son have for many years possessed the exclusive right to manufacture Mr. Varley’s Patent Double V. Insulators, and since the transfer of the telegraphs to the Government, the firm have executed immense quantities for that department of the public service. A demand having recently arisen for white-glazed ink and other bottles, additional appliances have been provided on the most approved and modern principles, which have enabled the firm to produce a class of ware of this description unrivalled alike for its excellence and appearance. [Illustration: Figs. 107 to 109.]