THERE are many different forms in which clay after it is burnt or baked is used by the builder and engineer.

Some of the more important of these will now be described under the following classification: -

Bricks.

Fireclay and Fire-bricks.

Terracotta.

Stoneware.

Miscellaneous clay goods of Earthenware, Fireclay, Stoneware, Terracotta.

Bricks

Ordinary building bricks are made of clay and other earths subjected to several processes (which somewhat vary according to local practice, influenced by the nature of the material), formed to the required shape in moulds, and burnt.