Leonardo da Vinci designed an odometer using a wheel to estimate traveled distances.
His recorded design linked the rotation of a wheel to a counting mechanism. As the wheel moved along the ground, gears could register each revolution and convert it into a distance reading. The idea reflects Leonardo’s interest in surveying, engineering, and the practical measurement of landscapes and construction sites.
An odometer measures distance traveled, not speed or direction. Leonardo’s design was mechanical and depended on the wheel’s circumference and the accuracy of its gearing. Similar distance-measuring devices existed before Leonardo, including ancient surveying instruments, so his importance lies in the clarity and sophistication of his design rather than in inventing the underlying concept from nothing.