H4. Marine timekeeper, H4. This is Harrison's prize-winning longitude watch, completed in 1759. Harrison had been working on improving watches as a sideline ...
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Harrison sea clock – H4 ; The secret can be heard ; in its rapid ticking. H4 ticks five times a second, since its large balance beats more ; quickly and with ...
John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, ...
Sep 2, 2019 · Christened H4 by Gould, the watch was essentially an extra-large pocket watch wound daily by key, with its 30-hour power reserve being stored in ...
Sep 15, 2021 · Find out about the John Harrison H4, the world's most important clock which can be viewed at the Greenwich Royal Observatory museum.
Duration: 29:02
Posted: Aug 22, 2012
Posted: Aug 22, 2012
Charles Frodsham and Co Ltd. Chronometer, Watch & Clock makers ... Harrison H4. John Harrison's Successful Longitude Timekeeper, H4; a Reconstruction.
After six years of work and innovation he developed the watch that came to be known as H4, accurate enough to solve the Longitude problem. It was the first true ...
Displayed worldwide at the Ships, Clocks and Stars: The Quest for Longitude exhibitions at the National Maritime Museum, America and Australia. This is the ...