Legendary English clockmaker John Harrison claimed, in 1775, that his clocks could keep time to within a second in 100 days. Ridiculed for centuries, he has finally been vindicated as a clock built to his design was awarded a Guinness World Record for “the most accurate mechanical clock with a pendulum swinging in free air”.http://www.salonqp.com/updates/watch-news/john-harrison-guinness-world-record-clock-greenwich-observatory/

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