To all,
At the site of De Zonnewijzerkring you may see three sundials on a child
friendly public square.
The main goal was:
"The plan was to be suitable for children, and to provide for several
educational elements."
For example:
The long hourlines are for practicing balance.
The blocks to climb on.
And many more things children can imagine.
Look for:
Work of members
Archives 2010
Month 10-06, june, Almere
and
Work of members
Archives 2011
Month -11, nov, Almere
Best wishes, Fer
Fer J. de Vries
De Zonnewijzerkring
http://www.de-zonnewijzerkring.nl
Molens
http://www.collsemolen.dse.nl
Eindhoven, Netherlands
lat. 51:30 N long. 5:30 E
----- Original Message -----
From: "Mac Oglesby" <ogle...@sover.net>
To: "Dave Bell" <db...@thebells.net>
Cc: "Sundial List" <sundial@uni-koeln.de>
Sent: Wednesday, May 16, 2012 4:32 AM
Subject: RE: Why are schools, across the world, 'banning'
analemmaticsundials ?
Hi Dave,
Bill Maddux's article is in Compendium vol 9 no 1, March, 2002, pp. 16-23.
Here's a screen shot of one of his constructions, from that article:
http://dl.dropbox.com/u/3688834/Maddux%20cord%20and%20spar%20dial.png
You can see a model by Fer de Vries at:
http://dl.dropbox.com/u/3688834/Model%20by%20Fer%20de%20Vries.png
The 2007 cord and spar workshop assembled models like this:
http://dl.dropbox.com/u/3688834/Spar%26Cord%20Workshop%20Model.png
Notice that this version makes it quite easy to adjust the "horizontal"
beam for EoT, daylight time, and longitude offset. The hour marks could be
applied to that beam empirically, or by simple computation. At the
workshop, a graphic was supplied to help with that marking chore.
Best wishes,
Mac Oglesby
I had to look this one up, found what I assume is the same under "Rope &
Spar sundial".
What a great idea!
I didn't have time (while at work) to figure out the details described of
how the spar is aligned to a particular angle, though. If it was level,
and
true East-West aligned (and maybe that's all that was being described!) it
should be able to be calibrated for local solar time.
So a beam or rope, stretched from a building to a pole or the ground,
parallel to the Earth's axis, and an E-W line on the ground below it
should
make a minimalist equatorial or polar dial, depending upon how you looked
at
its derivation...
Dave
-----Original Message-----
Just to set the record straight, the original
"Beam & Spar" dial was designed and constructed
by Bill Maddux. He was one of my early mentors
and later we collaborated (along with Fer de
Vries) on several sundial articles. Bill passed
away in 2004. In his memory, at the NASS 2007
conference in McLean, Virginia I led a brief
workshop where each participant assembled a small
Beam & Spar sundial designed specifically for
their home latitude.
Best wishes,
Mac Oglesby
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