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Red Time Ball Royal Observatory Greenwich Enabled Navigators To Verify Their Mar ...

Red Time Ball Royal Observatory Greenwich Enabled Navigators To Verify Their Mar ...

  Stockphoto ID: 3636428

File name: tx1926.jpg
Format: digital, 5000+ pixels longest side
Property release: no Model release: no
Source: photographer Based in: United Kingdom

Description: Red time ball Royal Observatory Greenwich enabled navigators to verify their marine chronometers from their ships on the Thames

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