Odometer
Videos
An odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two. The nou
An electronic odometer with digital display (blue digits below the speedometer) showing 91,308 miles.
Reconstruction of Vitruvius' odometer, 1st century BC, Roma, Thessaloniki Science Center and Technology Museum
A reconstruction of Hero' odometer, 1st century AD, Alexandria, in Kotsanas Museum of Ancient Greek Technology, Athens, Greece.
A Han dynasty stone rubbing of a horse-drawn odometer cart
Mechanical counter
Videos
Mechanical counters are counters built using mechanical components. They typically consist of a series of disks mounted on an axle, with the digits zero through nine marked on their edge. The right mo
Odometer
…List of vehicle instruments Mechanical counter Opisometer…
Several mechanical counters
Mechanical counter wheels showing both sides. The bump on the wheel shown at the top engages the ratchet on the wheel below every turn.
Early IBM tabulating machine using mechanical counters