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A large metal cylinder supported by a metal base, the Extruder does exactly what you might imagine: like a souped-up pug mill, it uses an electric motor to exert more than six thousand pounds of pressure on wet clay, pushing it through different molds and shapes, and then dropping it onto a catchment, which can be positioned at various heights.

Water and sand were added, and the concoction was mixed in a pug mill.

The first machine used to do all this work goes by the humble name of pug mill.

The pug mill has assumed many different forms in this age; and separate preliminary mills, consisting of rollers of different forms for grinding, alone are often used before the mixing operation.

In some the pug mill is arranged horizontally to feed out the clay in the form of a long horizontal slab, which is cut up into proper lengths to form the bricks.