Calculate - the etymology comes from the latin word for pebbles.
In Roman times, man-powered taxis would have a
bingo-like device that rolls with the axis of the wheel, depositing a pebble for each rotation into a basket below. At the end of the ride,
Book Spine Calculator the driver/runner would calculate the pebbles that got dropped into the basket, thus figuring out the distance, and the cost, of the ride.
