On another occasion he was on his way to attend the quarterly meeting of the sect at Exeter, and halted at Ashburton to refresh himself and his horse. After having lunched, he took up a copy of Sir Charles Grandison, in seven volumes, began to read, read on and on, finished one volume, took up the next, forgot all about his purpose of going to Exeter, and was found by the Friends on their return from that town, and the conclusion of the meeting, still immersed in Samuel Richardson’s novel. As novel-reading is forbidden in the Society, no doubt but that poor Cookworthy was severely reprimanded, and prayed for as a back-slider.
Porcelain in China has a high antiquity, and must have been made there at least 1250 years before it was manufactured in England; it was introduced into Europe in 1518, when it acquired the name of China. For a long period it was supposed that the fine white clay consisting of silica and alumina, and called by the Chinese Kaolin, was found only in the Celestial Empire, and specimens brought to Europe fetched a high price. At the beginning of the eighteenth century it was discovered in Saxony in an odd way. A merchant named Schnorr, being on a journey, was struck with the whiteness of some clay near Schneeburg, and collecting some of it, thinking it might be employed instead of wheaten flour for the manufacture of hair powder, used it for this purpose. It succeeded, but had this disadvantage, that wigs dressed with the new hair powder were very heavy. An apothecary named Bötcher noticed the increased weight of his wig and instituted inquiries, when he found that the new material used was precisely that which was required for the manufacture of porcelain; and Dresden china was begun to be made by him in 1709, and was carried on with the greatest secrecy, and the exportation of the earth was forbidden under heavy penalties.
In 1745, Cookworthy heard that a similar clay had been discovered in Virginia, and sent a Quaker to procure some for him. Somewhere about 1748 he himself discovered it in Cornwall. He wrote: “I first discovered it in the parish of Germo, in a hill called Tregonnin Hill.” After a long description of the properties of the clay and his experiments upon it, he says: “I have lately discovered that in the neighbourhood of the parish of S. Stephen’s, in Cornwall, there are immense quantities both of the Petunse stone and the Kaulin, and which I believe may be more conveniently and advantageously wrought than those of Tregonnin Hill, as by experiments I have made on them they produce a much whiter body, and do not shrink so much in baking, nor take stains so readily from the fire. S. Stephen’s lies between Truro, S. Austell and S. Columb; and the parish of Dennis, the next to S. Stephen’s, I believe, hath both the ingredients in plenty in it.”
The same materials were afterwards found at Boconnoc, the seat of the Hon. Thomas Pitt, afterwards created Lord Camelford. This discovery led to an acquaintance with Thomas Pitt, and together they obtained a patent in 1768 and started the Plymouth China Factory, that brought the manufacture of porcelain to great perfection; but for some reason did not yield profit to the patentees.
In precisely the same year kaolin was discovered at St. Yrīeix, near Limoges. The wife of a surgeon there had used it for the purpose of bleaching linen, when her husband, suspecting its real value, took it to Bordeaux, and on trial it was found to be the very thing needed as a base to real hard porcelain. The manufactory of Sèvres which had used imported Chinese clay, now employed that of St. Yrīeix; and the Limoges manufacture of porcelain was then started.
After six years’ trial, outlay, and discouragement, the Plymouth China Works were removed to Bristol and the patent was assigned to Richard Champion, a connexion by marriage of the Cookworthy family. The endeavour to make the porcelain manufactures there a paying concern failed as it had at Plymouth, and Champion removed his works to Staffordshire, where the fuel was close at hand. The Bristol patent-right was transferred to a company of six partners. Champion received through Burke, who was then in office, the appointment of Deputy-Paymaster of the Forces, in 1782, when he left Staffordshire, but on a change of Ministry he lost the post, and went to America, where he died in 1787. Neither his family, nor that of Cookworthy, ever received any benefit from the important art and industry they had been the means of establishing. William Cookworthy died on the 17th October, 1780. Among the worthies celebrated in the memorial windows of the Plymouth town hall is “William Cookworthy, Chemist and Potter, the discoverer of the English China-clay, and the first maker in England of true Porcelain.”
Abundant information relative to Cookworthy exists.
Memoir of William Cookworthy, by his Grandson, G. H. Harrison. London, 1854.
Relics of William Cookworthy, by John Prideaux. London, 1853.
“William Cookworthy and the Plymouth China Factory,” by R. N. Worth, in the Transactions of the Devonshire Association, 1876.