Original linen-backed French patent lithograph for Nikola Tesla's invention of a fluid propulsion apparatus, one page, 12 x 10.5, circa 1910. The purpose of the apparatus is to convert fluid motion into mechanical power, using a chamber with a spiral path, rotary pump, and rotating shaft. The diagram is headed "No. 421.543, M. Tesla, Pl. Unique." On the left side is an unrelated diagram for French patent "No. 421.542" granted to M. Quinquarlet for a pneumatic jack. In fine condition.
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