The purpose of pressing is threefold: to smooth, tighten and polish the fabric. This machine, which appeared in 1847, was the successor to the screw press, which pressed the sheet folded on itself under the action of the press plate. After passing between two brushes that cleaned and evened out the down, the flattened fabric passed into a concave bowl where it was pressed by a cylinder. This is heated with steam. The cylinder rotates slowly and causes the hairs on the fabric to rub against the bowl.