The Historic Harrison H4  
The Harrison H4 was the very timepiece that solved one of the greatest problems of the 18th century; that of accurately determining one's longitude at sea. An excellent book, entitled Longitude, has been written on the subject. The book has since been made into an A&E movie. Now you can have this piece of history alive and ticking on your computer desktop!

The complete history of this amazing clock can be found on the website of the National Maritime Museum, London. It's well worth the read!

ActiveEarth uses the Harrison H4 clock image under license from the National Maritime Museum, London. 

<< Prev 12345678 Next >>