You are using Internet Explorer 8 to view this site. IE8 is a 6-year-old browser that does not display modern web sites properly. Please upgrade to a newer browser to make best use of this site. Contact your local library branch if you require assistance. For more information, see this FAQ page.
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.