Machines for the rapid drying of fabrics or other materials by centrifugal force. They revolve so rapidly that the water is thrown off from the enclosed substance. The centrifugal process is also used as the final stage in sugar production, the sugar being placed in a perforated cage, and the machine whirled round at a speed of 1,000 rotations a minute. This throws off the molasses, and leaves the sugar crystals nearly white. In paper-making machines are fans which drive heated air against the inner surface of the paper, rapidly drying it.