Concrete Solar Concentrator

One idea is to make a concrete parabolic concentrator. For that we will make a parabolic wooden template which will be swept longitudinally through a mound of wet concrete. Sweeping once or twice would give us the parabolic shape of the concentrator. We will then let it dry and then finally we would paste aluminium foil on it. 
==External links==
* Free and Easy DIY Parabolic Solar Concentrator construction plans
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