600 BC First widespread amalgamation of geographical maps developed by Anaximander, although it is possible he had been exposed to mapmaking practices of the Near East.[8] Rutway c. 600 BC The 6 to 8.5 km long Diolkos represented a rudimentary form of railway.[9] Differential gears c. 100-70 BC The Antikythera mechanism, from the Roman-era Antikythera wreck, employed a differential gear to determine the angle between the ecliptic positions of the sun and moon, and thus the phase of the moon.[10][11] Caliper 6th century BC Earliest example found in the Giglio wreck near the Italian coast.