Re: Delta Cad stuff and more

[Simon \[illustratingshadows]

It is time I chirped up again. I added a vertical
decliner DeltaCAD macro that predominantly faces the
pole as opposed to the equator. It is on my DeltaCAD
page. And also a pdf case study on a S 5 W as well as
N 5 E vertical decliner, that is on the case study
page. And as a bonus for those with the Cortona
plug-in (see my avi page), I have added the sout and
north vertical decliner dial in vrml (wrl) so you can
rotate it. Good educational stuff.

There are a lot of case stud files for download so
that people can build their own out door sundials
using the case studies as a text.

Simon
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RE: Porcelain Sundials

[Roger Bailey]

Hi John,

The old wall dials in France and Italy are often painted using the fresco
technique. Here metal oxide pigments, ochre etc, are incorporated into the
lime plaster which converts to limestone. They are permanent and last as
long as the wall stands subject only to erosion of the limestone. This is
why many Zarbula dials still look fresh over 150 years later but are
generally they are washed by weathering or obscured by dirt. Chemically the
fresco pigments are as stable as glass but lime plaster is softer and more
subject to erosion.

Regards, Roger Bailey

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of John Carmichael
Sent: April 24, 2007 2:34 PM
To: 'Sundial List'
Subject: RE: Porcelain Sundials


p.s. But I still love the hand painted wall sundials found in France and
Italy, even if their paint doesn't last as long.


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