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Solar Tube - $45

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Basic Rand Solar tube ....

I did some home testing with this... using metal sheet metal as a basic reflector and sealing the end with a homemade plug to test it out. A great science project.
The following is a nice how-to guide:

http://www.solarguild.org/uploads/1/3/0/1/13016236/solar_oven_evacuated_tube_workshop.pdf

post id: 7759945030

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