Construction of the 35 ft (10.7m) mirror at the Mont-Louis Solar Furnace in France. The mirror concentrates solar rays to produce temperatures between 2000°C and 3500°C.
https://diqn32j8nouaz.cloudfront.net...ace_mirror.jpg
Previously:
https://www.homemadetools.net/forum/...144#post149657
https://www.homemadetools.net/forum/...764#post111513
