It's called a radiometer.
I went into the Exploratorium Store and there they were.
Deb
> Forwarded message:
> > From Bruce.Crain@Appropria.com Mon Jan 21 14:26:14 2002
> > From: Bruce Crain <Bruce.Crain@Appropria.com>
> > To: "'snacktalk@exploratorium.edu'" <snacktalk@exploratorium.edu>
> > Subject: give and take
> > Date: Mon, 21 Jan 2002 14:23:36 -0800
> >
> > What is the name of the "wind mill" type device whose "vanes" are painted
> > black on one side and white on the other and therefore spin when put into
> > sunlight also showing, like this science snack, that light contains energy?
> > Thanks for your response?
> >
> > Bruce Crain
> > Director Global Alliances
> > bruce.crain@appropria.com
> > 925-600-3103 office
> > 925-260-1976 mobile
> >
> >
>
>
---------------------------------------------------
Deborah Hunt
CTL Senior Information Specialist
Exploratorium
3601 Lyon Street
San Francisco, CA 94123
Voice: 415-353-0485
Fax: 415-561-0370
mailto:dhunt@exploratorium.edu
"A woman is like a tea bag; she never knows how strong she is until she's
in hot water." Eleanor Roosevelt
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