water does indeed migrate through the porous terracotta clay of the carafe where it evaporates, cooling the outer surface of the pot which in turn allows heat to flow by conduction from the inside of the carafe.
Ha! An epiphany... as TigerJimmy said (and failed to register with me) the water evaporates
inside the carafe (that's the partial pressure bit) absorbing the heat of vaporization and cooling the interior, and the water
vapor is what migrates through the terracotta.
It takes me a while, but sometimes I get there... eventually.
tanstaafl.
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