Longitude clock comes alive. John Harrison’s H4, the famous timekeeper that solved the longitude
problem, is running again this week for the first time in over a
decade. [BBC News: sci/tech]
bq. Harrison radically re-thought his design and produced H4, a timekeeper that resembled a large pocket watch. It was a revelation. In six weeks, it was out by just five seconds; an accuracy three times better than that required to win the