CNRS_20170052_0003

Wire surface, generated by a propeller and made by Joseph Caron, professor of descriptive geometry at the École normale supérieure (ENS), November 16, 1914. It is drawn on a cylinder of radius r, which rolls in a cylinder coaxial radius R> r. The surface contains three families of helices: those of the cylinder of radius r are red, those of the cylinder of radius R – r are blue and those of the cylinder of radius R are yellow. This object is part of the collection of mathematical objects of the Henri Poincaré Institute (IHP).

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