Puddling machine

Definition of puddling machine

• A puddling machine consists of a circular space, the sides and bottom which are lined with iron or laths of hardwood, with a perpendicular shaft moved by steam or horse-power, working in the centre of a circle. To the shaft are attached two harrows, which are dragged around the circular space, puddling the washdirt with which it is charged. Water is supplied in sufficient quantities to keep the charge in such a condition as to admit of its being puddled by the action of the harrows. The gold is left in the bottom of the circular space, and is finally cleaned by panning.

– The Gold Fields and Mineral Districts of Victoria, 1869