In modern times terra-cotta was used in the Victorian Gothic revival, notably by Alfred Waterhouse, and received widespread application in the United States as an exterior covering for the skeleton steel structure. It was used with consummate skill by Louis Sullivan for decorative stringcourses on many of his buildings. Modern sculptors who made notable terra-cotta works include Maillol, Despiau, Epstein, and Picasso. Terra-cotta has often been molded into the forms of the classical and other styles, with textures closely simulating various kinds of stone. However, it has been most successfully used not imitatively but on its own merits as a lightweight, nonbearing material, perfectly adapted to the task of sheathing a steel frame. Hollow blocks or tiles of rough terra-cotta are used extensively as a structural material for walls and partitions, for floor arches, and for fireproofing.
In modern practice terra-cotta is manufactured from carefully selected clays, which, combined with water and vitrifying ingredients, are put through a pug mill or other device to reduce the mass to homogeneity. In cakes of convenient size the clay passes to the molding room. Individual pieces are modeled by hand; in the case of repetitive pieces, the clay is pressed into plaster molds to form a shell. The molded pieces are finished by hand and then are ready for baking in a kiln or reverberatory furnace.
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