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Weren't these "heliostats" once built of gearworks, cogs and springs? 
Clockwork Heliostats!  You must wind your heliostat at least one a week or you'll freeze your buns!
-Reagan Cole
Durham NC

-----Original Message-----
>From: Kristian Anderson <[log in to unmask]>
>Sent: Apr 2, 2008 1:59 PM
>To: [log in to unmask]
>Subject: Re: Heliostat
>
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>One option you may want to consider is a "digial" heliostat.  We didn't
>have enough sunny days here in Iowa (as is likely in the UK!)to justify
>a real heliostat.  In addition, contractors abhor the thought of cutting
>holes in the roof a building.  We had Jeff Kennedy Associates design a
>system whereby a projector displays daily satellite images of the Sun
>onto a table.  The participant can select visible, ultraviolet and x-ray
>wavelengths and using a joystick can scroll forward or backward in time.
>It really gives a good sense of the Sun's rotation, as well as being
>able to correlate sunspots with active UV and X-ray regions.
>
>We also have an activity where students use ratios to determine the size
>of the Earth and other planets compared to the size of the projected
>Sun.
>
>Kristian Anderson
>Director of Platforms and Experience Development
>Science Center of Iowa & Blank IMAX Dome Theater
>401 W Martin Luther King Jr. Parkway
>Des Moines, IA 50309
>(515)274-6868 ext. 235
>(515)274-3404 FAX
> 
>www.sciowa.org
> 
>P Please do not print this email unless it is absolutely necessary.
>Spread environmental awareness.
>
>-----Original Message-----
>From: Informal Science Education Network
>[mailto:[log in to unmask]] On Behalf Of Harry White
>Sent: Wednesday, April 02, 2008 3:47 PM
>To: [log in to unmask]
>Subject: Heliostat
>
>ISEN-ASTC-L is a service of the Association of Science-Technology
>Centers
>Incorporated, a worldwide network of science museums and related
>institutions.
>************************************************************************
>*****
>
>Does anyone know of a vendor of display Heliostats? I know of the
>Sunspotter
>but I'm looking for something larger and more spectacular.
>
>Thanks
>-- 
>Harry White, Science Centre Consultant
>Techniquest, Stuart Street, Cardiff, UK. CF10 5BW
>Tel: +44 (0) 29 20 475 475, Direct: +44 (0) 29 20 475 464
>Fax: +44 (0) 29 20 482 517
>Mobile +44 (0) 7725 420 910
>Web: http://www.techniquest.org
>
>Techniquest is a Company Limited by Guarantee,
>registered in England and Wales, no. 1955696
>It is a registered as a charity, no. 517722
>
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>Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

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