This programme is about time, and our object is a clock - a marine chronometer made around 1800. But the point of this clock wasn't so much to tell you the time as to tell you where you were.

Last week we received an original Hamilton Model 21 marine chronometer, perhaps the most famous timepiece of World War II. While no mechanical timekeeping device can match the accuracy of today ...

This programme is about time, and our object is a clock - a marine chronometer made around 1800. But the point of this clock wasn't so much to tell you the time as to tell you where you were.