In experiment several methods work successfully to produce electricity other than by fuel or waterfall. Rising and falling tides contain huge power; hence a project is under way for dams and spillways where Maine and New Brunswick meet at Passamaquoddy Bay. The sun pours billions of heat units upon the earth; hence an experimental sun engine at Mount Wilson Observatory. Volcanic regions are hot just below the ground surface; hence on the west U. S. Coast and in Italy pipes are driven down, water poured into them, useful steam taken out. The surface...
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