"Cicero" wrote in message
o.uk...

...
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You might consider incorporating unglazed earthenware pipes or tiles into
your design. Old fashioned butter and milk coolers were made from clay and
had to be soaked in water periodically but worked pretty well. A scaled up
version might be possible.

Yes, I have one of those. Before we discovered 'Lurpack Spreadable', it kept
the butter at just the right temperature throughout the summer. It just
needed topping up with water every couple of days.

-- JJ