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

David Savory wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> 2-shay with respect to play.
>
> As for playful alternatives to a laser maze, I have always been partial to bouncing the light off mirrors that wobble as they rotate creating Lissajous patterns. Oldsters will be reminded of spirograph pattens. Youngsters will be amazed afresh.
>
> David Savory
> Community Extensions Program Developer and Exhibit Curator
> Science World British Columbia
That is the basis of a Thorton Scanner.  Actually, you put the mirrors 
on low RPM motors with
potentiometers controlling speed and you can get some interesting shapes 
if you use three
mirror/motors.  This is much much better, BTW, then using mirrors on 
speaker cones.

Back to the fog question - the cheaper DJ type foggers do leave 
residue.  The best fogger
I have seen was built in Quebec, Canada and used a water based mist.  
They used
this at the International Laser Display awards several years and I was 
impressed with it.
No residue and doesn't make a fog that is so thick you can't see 
anything else.
Of course, it wasn't cheap like the oil-based fog machines.


-- 


Clear DARK Skies,


Jack Dunn - Mueller Planetarium

***********************************************************************
For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.

Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
http://www.lsoft.com/LISTSERV-powered.html.

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]