Strange cooling methods: was Re: Peltier devices

Bill Smith (
Wed, 30 Mar 94 10:22:50 EST

Since we're veering into physics a bit here: does anyone else
remember the cooling device that was one of the projects in a fairly
old collection of _Scientific American_ amateur scientist projects
that used high pressure air and a strange funnel to create a stream of
cooled air? I'm afraid I can't remember the details, but at the time
it wasn't entirely clear how the cool air was produced -- there was
some speculation about Maxwell's demon.

Also, though it's pretty low tech and would involve some
experimentation and daily work, wouldn't a jar of ice suitably
insulated to melt slowly work pretty well?

Bill Smith