One O'Clock Gun

History of the Nelson Monument time ball

1852 - Nelson Monument, Calton Hill

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Time ball set up on the Nelson Monument, Edinburgh. Ritchies design and supply the electric clock.
 
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The time ball was raised halfway up the mast at five to one. The time ball was raised again two minutes later. The ball dropped at one when the time signal was transmitted from the observatory releasing the mast's two retaining pins. Reconstruction based on Deal time ball lifting mechanism.
 
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