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LETTER OF THE MONTH
Unforeseen benefits
While on holiday on Cornwall in September, looking around at the old tin mine engine houses got me in mind of your cover feature, ‘Earth’s Mysterious Core’ ( June, p66). With numerous articles on renewable energy, a thought occurred that an infinite supply of wind power was staring me right in the face: the mining chimneys. With the differential in air pressure creating a constant breeze upwards, would it just be a matter of adding a turbine inside each chimney stack, and off you go? Perhaps the people who built them were a couple of centuries ahead of their time.