
London
Folder: UK
30 Apr 2012
13 favorites
3 comments
Längengrad: Harrison's clock H4
Seen in Royal Observatory Greenwich.
Dava Sobel 's book (with William J.H. Andrewes), Longitude, an illustrated edition gives an excellent description of the search for accurate timekeeping which was utmost important for navigation at sea
30 Apr 2012
10 favorites
2 comments
Längengrad: Harrison's clock H1
Seen in Royal Observatory Greenwich.
Dava Sobel 's book (with William J.H. Andrewes), Longitude, an illustrated edition gives an excellent description of the search for accurate timekeeping which was of utmost importance for navigation at sea
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