Nikola Tesla U.S. Patent 1,061,142 - Fluid Propulsion Patent Wrapper Page 21

T ) 3 J 8155 11. A thermo-dynamic converter comprising a shaft, a plurality of disks spaced thereon, an inlet for the motive fluid at the periphery of the disks and tangential thereto, and an outlet at the central portion of the same, as set forth. -15821