Before revision: Schematic figure of a Brownian ratchet In the philosophy of thermal and statistical physics, the Brownian ratchet or Feynman–Smoluchowski ratchet is an apparent perpetual motion machine of the second kind , first analysed in 1912 as a thought experiment by Polish physicist Marian Smoluchowski.M.
After revision: (converting thermal energy into mechanical work)Schematic figure of a Brownian ratchet In the philosophy of thermal and statistical physics, the Brownian ratchet or Feynman–Smoluchowski ratchet is an apparent perpetual motion machine of the second kind , first analysed in 1912 as a thought experiment by Polish physicist Marian Smoluchowski.M.