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Nature Technology

  2.a Odometer


Forerunner of the modern speedometer, this device was connected to the wheel of a cart. It had a series of cogs which, with every turn of the wheel, caused a vertical blade to click.

At the end of every complete revolution of the blade, a horizontal wheel is released, allowing a pebble to drop into a container below.

The system was calibrated so that a pebble fell after each Roman mile.


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