Instructables

Daniel's Solar Cooker

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video Daniel's Solar Cooker
This solar heat ray can produce temperatures exceeding 1800 F� at 10 feet focal length to 300 F�  at 100 feet focal length.
GREENPOWERSCIENCE (author) 1 year ago
Smaller quick version:

http://www.instructables.com/id/TRASH-CAN-LID-concave-death-ray-solar-mirror/
brilliant! a superb way of harnessing free power for something useful
GREENPOWERSCIENCE (author)  radicalmart1 year ago
thank you:-)