In Longton the firm of Charles Harvey is notable, since the proprietor became, about 1820, the first banker at the Longton end. Mrs Mary Cyples represents a family of potteresses whose factory is perpetuated in Cyples Lane. Messrs Cheetham and Wooley invented a hard white stone body resembling porcelain, very useful for relief decoration,[164] and flourished in Commerce Street for more than half a century. The Locketts are one of the few firms which have lasted over a hundred years. The potting industry, like all others, suffered stagnation during the French wars. Till 1810 however the growing American trade compensated to a certain extent for the loss of the continental market. But in 1810 the Orders in Council stopped both the continental and American trade. These Orders were rescinded in 1812, but the continental trade languished till 1814, and had to be rediscovered and re-established as an entirely new business when peace came. When at last the Continent was reopened to English china and earthenware one particular firm came to the front and took the greater part of the ornamental trade. This was the firm of John Davenport & Sons. John Davenport came of a small yeoman family settled near Leek, and he started in 1785, first as a workman and later as a partner, with Thomas Woolfe of Stoke. In 1794 he commenced making china on his own account at Longport.[165] The first factory built on the canal at Longport was, appropriately enough, put up in 1773 by John Brindley, the younger brother of the engineer. Edward Bourne and Robert Williamson followed, and in 1795 Walter Daniel put up a fine house and factory at Newport near by. All these factories became, early in the nineteenth century, the property of the great firm of Davenport, attached to the “Unicorn Bank.” John Davenport had built the “Unicorn Bank” in 1794 for the manufacture of china. In 1797 they started the chemical preparation of litharge and white lead; and in 1801 was added the manufacture of flint glass.[166]