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They're pretty common, you may want to look in the Cheapbook or the
Exploratorium Cookbook/Snackbook, it might be there.

Beryl

>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>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
>1.877.694.4032
>
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--
Beryl Rosenthal, Ph.D.
Director of Exhibitions and Public Programs
MIT Museum
265 Massachusetts Ave.
Cambridge, MA  02139
Tel: 617-452-2111
Fax: 617-253-8994
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