Leonardo da Vinci designed an odometer to record the distance traveled by a moving cart.
His mechanism used a wheel that turned as the cart moved. Gears transferred the wheel’s rotation to a counting device, allowing the machine to register distance in regular increments. This was a mechanical solution to a practical surveying and engineering problem.
The concept belongs to the long history of odometers, which existed in ancient forms before Leonardo’s time. Leonardo’s importance lies in the clarity and sophistication of his Renaissance design, preserved in his notebooks rather than as a known mass-produced instrument.
An odometer differs from a speedometer. An odometer totals distance, while a speedometer shows current speed. Leonardo’s cart mechanism is also distinct from his self-propelled cart, which was designed to move under its own stored mechanical power.