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we've been using overhead projectors for those cool interference pattern transparencies that explo came up with a long time ago, also polarizing lenses and scotch tape is endless fun for some.  

eric siegel

On Jul 9, 2012, at 2:34 PM, jeff courtman wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
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> 
> Occasionally I will see surplus overhead transparency projectors for sale
> cheap - last week 20 of them, with stands went for about $40 on a local
> school auction site.  I've thought about bidding next time for the lenses
> and light sources, but I'm curious if anyone else has scavenged for parts
> and what use you've made of them?
> 
> Many years and several jobs ago, a guy I worked with (Dave Sanders)
> prototyped a simple wave tank  using such a projector.  You could gently
> blow on the fluid, set different acrylic shapes in the shallow water, etc.
> It was pretty cool!  If you have one of those projectors just laying
> around, I highly recommend the activity!
> 
> Jeff Courtman
> 
> P.S. - to my friends on the list-serv, please note the new email address on
> this message :).
> 
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