While I was looking for the history of pedometers on the web I came across this illustration of a device used by the Romans. Here is a closeup: A description on how it worked: A gear with one tooth (A) fastened to the wheel of the cart turned a larger wheel (B) with 399 short teeth and one long tooth (C). The tooth turned the drum (D) with teeth and holes for pebbles. As the drum was turned, a rounded pebble would fall into the metal bowl (E), indicating that the cart had traveled one Roman mile. I lost the link to this site but here's a link with more information: http://encyclopedia.tfd.com/pedometer
3 hours ago
