Salt water covers seventy per cent of the earth's surface; a gigantic challenge to our curiosity and scientific skill.
Tides once a day; tides twice a day; tides two feet high; tides fifty feet high. Every tide is different and our best 'predictions' are still basically guess-work.
Peter Stone introduces the third of four programmes
with Dr. J.R. Rossiter, Tidal Institute and Observatory, University of Liverpool.
(First shown on BBC-2)
(Last programme in this series: Thursday evening)
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