The inventor Eckhardt claims that his sloping wheel moves twice as much water as a standard wheel. Yet the invention does not cause the dreamed revolution in poldering. Eckhardt, 1770 National Archive, Collection of domestic maps and drawings Hingman, second supplement, 290 The National Archive presents in collaboration with the Technical University of Delft and Kunsthal Rotterdam a versatile family exhibition on Dutch inventions and innovations at the Kunsthal Rotterdam. December 19, 2009 until March 21, 2010;

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