The story of John Harrison, inventor of watches and clocks, who spent forty years working on a time-machine which could be used to accurately determine longitude at sea.
Presents an illustrated account of eighteenth-century Englishman John Harrison's forty-year quest to create a perfectly accurate sea clock that would allow sailors to measure longitude.
Describes the need for sailors to be able to determine their position at sea and the efforts of John Harrison, an eighteenth century man who spent his life refining instruments to enable them to do this.
