Hi Fer and all,
Fer is right, it's the same as for a sphere.
For the dam, you need to find the point of the ballustrade where an hour plane
tangents the ballustrade
and then the hour line is the intersection of this hour plane and the dam cone
which could be drawn with a laser.
My favorite funny dials, the conical ones...
The sundial has been inaugurated this week-end, but I found only one article
with more information:
http://irfu.cea.fr/Sap/Phocea/Vie_des_labos/Ast/ast_visu.php?id_ast=2614
=> use your favorite translators
Joël
48°01'25'' N, 1°45'40" O
---> http://www.cadrans-solaires.fr/
----- Original Message -----
From: fer de vries
To: sundial
Sent: Friday, June 19, 2009 10:38 AM
Subject: Re: Translations
Friends,
The basics for the dam-dial is a shadow tangent to an hour line.
More about these basics may be read in:
Compendium, Nass, vol. 12, nr. 4, December 2005,
Alessandro Gunella, Italy, A sphere as a gnomon......
Compendium, Nass, vol. 13, nr. 1, March 2006, letters.....,
Note by Rolf Wieland, Germany, Spherical gnomon.
Instead of a sphere here a horizontal disk, the edge of the ballustrade, is
used as shadow caster.
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
---------------------------------------------------
https://lists.uni-koeln.de/mailman/listinfo/sundial
