UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY
Perpetual motion: Grinding mill driven by horizontal water wheel, which is itself driven by water from a cistern. The wheel is supposed also to raise water to the cistern by an Archimedean screw. The wheel, C, has curved blades, an early form of water turbine. Engraving from Theatrum Machinarum Novum by George Andreas Bockler (Nuremberg, 1673).
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