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Posted by cranky on June 29, 2007, 1:06 am

Maria Telkes (correst spelling?) was a very brilliant engineer from Poland
designed a flotation device that could be used by sailers stranded at sea
the big war.  She felt obligated to come up with something to help keep men
from dying of thirst while bobbing in a sea of salt water.

Posted by marchenchuches on July 4, 2007, 1:20 pm



No, you are right. Solar desalination has been deeply studied and
experimented in Sahara just after WWII. I still have pubications covering
this subject.

Posted by Morris Dovey on June 28, 2007, 8:44 pm
 David Williams wrote:

| I have a suspicion that the Egyptian pyramids may have been used for
| the same purpose. Nobody in his right mind drinks water from the
| Nile. But, in the Nile valley, the humidity is quite high, and was
| probably
| even higher a few thousand years ago. If suitable surface materials
| were used on the pyramids, I think it's quite plausible that
| considerable amounts of clean water would have condensed on them,
| enough to keep the royal family alive and healthy anyway.
| I'm going (back) to Egypt in a few months. I'll see if I can find
| any evidence to support this idea.

Wouldn't that have worked better if the pyramids had been built

My understanding is that the pyramids originally were faced with a
light-colored rock (marl?)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by jukka matikainen on June 28, 2007, 8:58 pm
 "light-colored rock (marl?)" has functioned like a mirror; stone has not got
so hot daytime and that´s why it would cool down so fast that the dew would
condense on it...
whether the egyptians would have used the water; evidence of it were nice to

Posted by Morris Dovey on June 29, 2007, 5:33 am
 David Williams wrote:

| Are you suggesting that the pyramids should be point-down?!

Of course! Leaving aside the obvious minor structural issues, a
point-down orientation would ensure that the collection faces would
remain shaded through the hottest part of the day and minimize
evaporation of the collected dew.


Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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