ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

You probably couldn't get much simpler than this system, invented by AG Bell.

http://www.scitechantiques.com/belldiscovery/



On 1/10/06, Nina Simon <[log in to unmask]> wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Dear Science Whizzes,
>
> I'm working on a spy gadget workshop in which the kids will build
> several devices to use in a training mission where they have to escape
> from a hostile compound.  We're hitting a variety of stuff--IR goggles,
> booby traps, UV detectors--and I want to include a simple metal detector
> that they can use to sweep for bugs.
>
>

--
--
Bear AKA Lawrence Beals
PIG DEAD. SOLDIER ON.
VPAS - Jones Magnet Middle School Planetarium
groups.yahoo.com/group/vpas
--

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at http://www.astc.org.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]