6,000-year-old ignitor world’s oldest solar device: author

By CleanTechnica
Friday, June 6, 2014 4:59 EDT
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World’s Oldest Solar Device (via Clean Technica)

Originally published on Green Building Elements.By John Perlin Special thanks to author John Perlin for this contribution about what is believed to be the world’s oldest solar device – a solar ignitor, or yang-sui . The material comes from Perlin…

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