Medwith, Robert wrote on 5/24/2007, 5:35 PM:  [snipped]

> Easiest Solar unit is a plastic sheet over a hole in the ground, with a rock to hold down center.
> A glass or jar under plastic sheet in center.


That's interesting, Bob.  For the plastic sheet, do you mean something similar to the thickness of a tarp? 
How long does it usually take for the water to boil?

Thanks.  Jodi
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