> -----Original Message-----
> From: [EMAIL PROTECTED] On Behalf Of Michael A. Stone
> Sent: Thursday, October 22, 1998 3:02 PM
> ... Maxwell postulated a Y-shaped pipe with a little critter sitting
> at the fork called a daemon. the deamon's job is to watch atoms
> coming in from the base of the pipe, and send them out the left
> fork if they're moving slowly, and out the right fork if they're
> moving quickly.
That was my 9th grade science fair project, the "Hilsch Vortex Tube."
Air out the left tube was -20C, right was +72C. Went all the way to
the Nationals in '60.
Bob Munck
Physics/CS Brown '67
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