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UK researchers have built a small device that measures tiny fluctuations in gravity, and could be used to monitor volcanoes or search for oil. Such gravimeters already exist but compared to this postage stamp-sized gadget, they are bulky and pricy.
 gravitation tide
In the turbulent waters off the shores of Orkney, in the far north of Scotland, an array of bizarre machines is being deployed in a drive to harness the power of the sea.


 Orkney energy wave tide ocean
None of us can feel it, but Britain rises and falls by centimetres every 12 hours and 25 minutes as a great bulge of ocean water washes around the country.


 Loch Ness lake UK gravity Sun Moon ocean tide spirit level