<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000">Here is what the books says:</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:small;color:#000000">Around sundown, Egyptian women placed water in shallow clay trays on a bed of straw. Rapid evaporation from the water surface and from the damp sides of the tray combined with the nocturnal drop in temperature to freeze the water - even though the temperature of the environment never fell near the freezing point. Sometimes only a thin film of ice formed on the surface, but under more favorable conditions of dryness and night cooling, the water froze into a solid slab of ice. bill w</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 2, 2020 at 4:04 AM Ben Zaiboc via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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On 02/07/2020 01:38, Adrian Tymes wrote:<br>
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<div dir="ltr">In large evaporative coolers: <a href="https://en.wikipedia.org/wiki/Yakhch%C4%81l" target="_blank">https://en.wikipedia.org/wiki/Yakhch%C4%81l</a></div>
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<div dir="ltr" class="gmail_attr">On Wed, Jul 1, 2020 at 1:36 PM
William Flynn Wallace via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a>>
wrote:<br>
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<div class="gmail_default">Here
is one I ran across in an article on air conditioning. In
ancient Egypt ice was made. How did they do it?</div>
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I don't know if evaporative cooling on its own could make ice, but
it gets very cold at night in the desert, so maybe repeated exposure
at night and insulation through the day would do it.<br>
<pre cols="72">--
Ben Zaiboc</pre>
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