device for producing paper, paperboard, and other fibreboards, invented in 1809 by John Dickinson. It consists of one or more tubes of wire screen partially immersed and rotated in a vat containing a mixture of pulp and water; the screen picks up a film from which the water drains, leaving a wet sheet that is transferred from the cylinder onto a felt in a continuous web. Cylinders may be used in more than one vat to produce films of varying properties before further drying by pressure and heat.