Half a croissant, on a plate, with a sign in front of it saying '50c'
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Digital Solar Kiln

Pipe heated with moving solar concentrating lenses
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Solar concentrating lenses each concentrate a heating spot moving along a pipe so that the air begins moving through the pipe, creating a gradient of heat in a constantly moving air stream.

The air reaches 800 degrees and can be used for incineration without any further fuel.

pashute, Sep 15 2014

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