A cart fitted with a HODOMETER
Viae | Road Map | Pictures
The Romans used a device called a Hodometer to measure distances. An elaborate gear assembly caused a rounded pebble to fall into a metal bowl after each mile.

The cart also had special wheels, 4 feet in diameter and 12.5 feet in circumference. Four hundred revolutions made a Roman mile.

See Also
  • Chorobates, Groma, Vitruvius
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