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THREE:The production of copper during this period was so plentiful, that, though the great mines in Anglesea were not yet discovered, full liberty was given to export it, except to France. From 1736 to 1745 the mines of Cornwall alone produced about 700 tons annually, and the yearly amount was constantly increasing. A manufactory of brass��the secret of which mixture was introduced from Germany, in 1649��was established in Birmingham, in 1748; and, at the end of this period, the number of persons employed in making articles of copper and brass was, probably, not less than 50,000. The manufacture of tinned iron commenced in Wales about 1730, and in 1740 further improvements were made in this process. Similar improvements were making in the refinement of metals, and in the manufacture of silver plate, called Sheffield plate. English watches acquired great reputation, but afterwards fell into considerable disrepute from the employment of inferior foreign works. Printing types, which we had before imported from Holland, were first made in England in the reign of Queen Anne, by Caslon, an engraver of gun-locks and barrels. In 1725 William Ged, a Scotsman, discovered the art of stereotyping, but did not introduce it without strong opposition from the working printers. Great strides were made in the paper manufacture. In 1690 we first made white paper, and in 1713 it is calculated that 300,000 reams of all kinds of paper were made in England. An excise duty was first laid on paper in 1711. Our best china and earthenware were still imported, and, both in style and quality, our own pottery was very inferior, for Wedgwood had not yet introduced his wonderful improvements. Defoe introduced pantiles at his manufactory at Tilbury, before which time we imported them from Holland. The war with France compelled us to encourage the manufacture of glass; in 1697 the excise duty, imposed three years before, was repealed, but in 1746 duties were imposed on the articles used in its manufacture, and additional duties on its exportation. The manufacture of crown glass was not introduced till after this period.