253,481. Mattos, S. M. M. de. June 9, 1925, [Convention date]. Self-driving machines.-A self-driving apparatus which performs external work and also produces a continuous supply of liquid air comprises a chamber A for compressed air, a turbine C driven by the compressed air the exhaust passing through a rotating wheel F and back to the air chamber A. The wheel is rotated with a velocity substantially equal to the molecular velocity of air and acts to produce a vacuum in boxes G, H which communicate with chamber A and the atmosphere. The action of the apparatus is stated to be continuous, and to continuously liquefy the air in chamber A, so that not only can liquid air be drawn off at a tap but also the energy of the compressed air may be utilized for driving a turbine L or a piston engine which can thus perform external work. The turbine L is arranged so that it will run in either direction.
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