Clay Glazes and Enamels (Dodo Press)

"The subject of the manufacture of glazed brick and sanitary ware has been treated more by English writers from an English standpoint than it has by American writers. The clays of our country are so little known to-day, in respect to their adaptability to this purpose, and the majority of them are so different from the English clays in use, that English experience and receipts are hardly applicable to our purposes. We have no clay or class of clays that are known to be specially adapted to the manufacture of these goods, and, in consequence, we cannot have cut and dried rules for their production. The treatment given each clay must depend upon its various characteristics, and must vary therewith. As our experience becomes greater we may develop a clay or class of clays that are specially adapted to the business, and may be able to agree upon a best method of handling them. Until that time, each individual must do the best he can, and use such methods and schemes as he finds best adapted to the clays with which he has to deal. " Это и многое другое вы найдете в книге Clay Glazes and Enamels (Dodo Press)