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HERON'S ODOMETRO

The so-called Heron's odometro was most probably an invention made by Archimedes. Vitruvius was the first writer who mentioned the instrument. Its full description is found in Heron's work Dioptra. The odometer was used in order to calculate road distances. The function of the mechanism relies on a system of gears which, assembled with screws and transferred the movement on the wheels onto three circular discs at the upper part of the instrument, where the traveled distance was measured.