Excerpt from The Development of a Hard Boro-Silicate Glaze for American Porcelain American porcelain is glazed at a much lower temperature than the European porcelain. The glazes employed are the same as are used on whiteware, viz., borosilicates of lead, calcium, the alkalies, and aluminium. A good glaze of this type possesses high brilliancy, an excellent surface texture, low viscosi ty, and a comparatively long range of fusion. Owing to the fact that American manufacturers biscuit their ware at a high temperature, glazes of the true porcelain type are not used. The cost and' danger of loss from warping and deformation of the body make two successive burn ings at cone 8 or higher, prohibitory. In Europe on the other hand, porcelain is biscuited at a low temperature, approximately 110000, and leadless glazes ma turing from cone 8 to cone 15 can be used. These glazes lack the high gloss and smooth surface texture possessed by those of the whiteware type but have the great advantage of being materially harder. The relative softness of the latter type may be considered a serious defect inasmuch as American porcelain is easily marked with cutlery. It is not an uncommon sight to see plates and similar arti-j cles of American manufacture covered with hundreds of small scratches. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.