Villard’s Hammerwheel

A short video of a physical reconstruction of Villard de Honnecourt’s sketch of a “machine that moves itself”, that is, a supposed perpetual motion machine. To give you the long version short: it is NOT a perpetual motion machine. In fact, it works as a self-braking wheel because the center of gravity is always below the axis (thus it works like a pendulum with considerable friction in it, so slows rapidly). For more information on this see my article, “Villard’s Perpetuum Mobile,” AVISTA Forum Journal 18.1/2 (2008): 24-30.

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