Educative item explaining how interrelationship between moon and earth produces tides.
A man in the old magician costume investigating a globe. Several shots of giant waves breaking over town wall. Voiceover talking about tides. King Canutah Kanutah (King Canute) at his throne ordering tides not to touch his feet. However, his feet did get wet.
The sea advances and recedes during periods of high and low tides. Sir Isaac Newton has established and explained connection between tides and the moon. Several shots of a man in scholar's robe studying - presumably Newton.
Succession of diagrams explaining the phenomenon of tides. First several diagrams showing how the force of gravitation works. Next several diagrams showing how the earth's gravitation force interacts with moon's gravitation force to produce high and low tides.
Several shots of the sea.