Probably the best known timepiece in the world is Big Ben, giant clock atop the Houses of Parliament. His Majesty's Astronomer Royal, Sir Frank Watson Dyson revealed in London last week that Big Ben was not only one of the most famed, but, for an old clock, one of the most accurate of timepieces. After a 288-day comparison with the Royal Observatory at Greenwich (Astronomer Dyson's special charge) it was found that Big Ben's maximum deviation was only 1.4 sec. per day, that only on 21 days in the whole period of observation did...
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