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Pliny the Elder, The Natural History (ed. John Bostock, M.D., F.R.S., H.T. Riley, Esq., B.A.), BOOK XXXVI. THE NATURAL HISTORY OF STONES., CHAP. 66.—THE VARIOUS KINDS OF GLASS, AND THE MODE OF MAKING IT. (search)
ee parts of nitre, either by weight or measure, and, when fused, is transferred to another furnace. Here it forms a mass of what is called "hammonitrum;" which is again submitted to fusion, and becomes a mass of pure, white, glass. Indeed, at the present day, throughout the Gallic and Spanish provinces even, we find sand subjected to a similar process. In the reign of Tiberius, it is said, a combination was devised which produced a flexibleKnowles says, in his Turkish History, p.1273, that in 1610, among other rare presents sent to the King of Spain from the Sophy of Persia, there were six drinking-glasses, made of malleable glass so exquisitely tempered that they could not be broken. glass; but the manufactory of the artist was totally destroyed, we are told, in order to prevent the value of copper, silver, and gold, from becoming depreciated.Dion Cassius and Suetonius tell a similar story; and, according to one account, Tiberius ordered the artist to be put to death. This story, howe