Amazingly accurate clock finally recognised after 300 years - Guinness World Records 

A pendulum clock based on an 18th century theory dismissed at the time, has been recognised by Guinness World Records for its accuracy.
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Proving perhaps to have been too visionary for its times, “Clock B” has been awarded with a world record for most accurate mechanical clock with a pendulum swinging in free air, vindicating the vision of its original designer John Harrison
Work on Clock B was started in 1975 by Martin Burgess, based on a design by 18th Century clockmaker Harrison, who is also famously renowned as the finder of longitude at sea.
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