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The items you are talking about are called Chaldni Plates.
There is a picture of them on the Exploratorium website
http://www.exploratorium.edu/imagery/exhibit_stills.html
David
David Taylor
AHHA Museum Services
Now I Understand
1560 NW Woodbine Way
Seattle, WA 98177
(206) 363-8126
e-mail: [log in to unmask]http://www.AHHA-MuseumServices.com
> From: Chad Johnson <[log in to unmask]>
> Reply-To: Informal Science Education Network <[log in to unmask]>
> Date: Fri, 24 Sep 2004 09:29:38 -0500
> Subject: Vibration exhibit
> *****************************************************************************
> A year or two ago when I was doing some research on sound exhibits I ran
> across a place that had different shaped metal plates that visitors would
> place sand on top and "play" with a bow. I believe this would show vibration
> patterns in the sand. Does anyone know what I am talking about and where I
> might get some information on building an exhibit like this?
>
> Thank You
> Chad Johnson
> Experiential Educator
> The Edgerton Explorit Center
> http://www.edgerton.org
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