Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham - Quill & Pad
quillandpad.com
Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham - Quill & Pad
Here we present the full three-part series about the making of Derek Pratt's John Harrison H4 reconstruction, originally written by Roger Stevenson, chief watchmaker at Frodsham.
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Take a trip to the Royal Observatory this weekend to learn how John Harrison helped solve the problem of finding longitude at sea with the H4 pocket watch: http://bit.ly/JohnHarrison-rmg | Royal Museums Greenwich
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