In article ,
lawrence.jenkins writes:
Radio 5 did a piece yesterday about the Edwardians and their Sash-Cord
windows. Apparently there's an optimum position to enhance cooling.
Trouble
was I didn't get to hear it.

There was a piece about it in the newspaper. Apparently the trick is to
have both the top and the bottom open. Cooler air comes in at the
bottom, forcing the warmer air out of the top.
--
John Hall
"Nothing matters very much,
and most things don't matter at all."
Attrib. Arthur Balfour