The Time Ball of the Royal Observatory (Tony Dobson) London from Greenwich Park, 1833-43, by Read; Chevanne; Read & Co; Mandeville Tony Dobson narrates the history of the Time Ball of the Royal Observatory, and why it was made by the Admiralty as a time-piece.

The Time Ball can still be seen in action daily at the Royal Observatory, Greenwich.

Objects referenced

• View of the Royal Observatory and Time Ball, 1833-43
• Animation of the Time Ball
• John Harrison's marine chronometer, H4

Download the Time Ball of the Royal Observatory talk (2.02 MB | 2.12 min)