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出典:『Wikipedia』 (2010/03/19 23:58 UTC 版)

英語による解説

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Deal Timeball is a Victorian maritime Greenwich Mean Time signal located on the roof of a waterfront four-storey tower in the coastal town of Deal, in Kent, England. It was established in 1855 by the Astronomer Royal George Biddell Airy in collaboration with Charles V. Walker, superintendent of telegraphs for the South Eastern Railway Company. It was built by the Lambeth firm of engineers Maudslay and Field. The timeball, which, like the Greenwich timeball, fell at 1 pm precisely, was triggered by an electric signal directly from the Royal Observatory.