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It isn't a heliostat, but we've just purchased a solar telescope from John
Welsh at Scopin' USA
http://www.scopinusa.com/

He's developed it himself, and there's no way for anyone to hurt their eyes
using it to look at the Sun; the Sun is projected inside of the telescope
onto a screen that's several inches across and can be viewed by a small
group together.  Sunspots can be measured, and the image can be traced on
light paper.  Very affordable, and fairly new (he hasn't started
mass-production yet.)  Great for a small portable program.  (The only way
you could hurt someone is by picking up the telescope and swinging it at
them.)
_______________________________________

Christine Shupla
Planetarium Director
Arizona Science Center
(602) 716-2078
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