Fulling' Mill. A power-machine for fulling and felting woven fabrics, to improve their texture by making them thicker, closer and heavier. Such mills operate by means of rollers, stampers and beaters, of various sizes and forms, but usually of wood, which roll, toss and press the fabric in hot suds and fuller's earth till the required texture is obtained. The result of the process is a reduction in length, in width, and in case of hats of size. [See Hats].