World Clock

Twenty four cities are marked around the cylindrical body, two for each number on the dial. Set the clock to your local time, and whenever you want to check the time in a different city, simply roll the clock so that the new time zone is in the twelve o'clock position.

A counterweight at the bottom keeps the hands from moving, so you can always easily tell the time. Once released, the counterweight automatically rolls the clock back to its original position.