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.
There is a growing demand for enameled goods, and a desire on the part of many to meet this demand, but lack of experience, and especially of guidance, through books on the subject, written from a home standpoint, have discouraged them from undertaking it For such people this little work is written. It makes no pretense of being either new or complete, but simply gives the views of the writer, formed from considerable experience with American clays. It represents what he has found best in treating them, and is not written for the initiated. In many ways these views are very different from those of the English writers on the subject, but the clays from which they are formed are also different There will also be found many points in common between us.
My sincere hope is that, crude and incomplete as the work may be, it will be of assistance in some particular.
Henry R. Griffen, C. E