Hello Thibaud As the one who started this thread on the Amsterdam Sundial, I assume this is the Church next to the Royal Palace. My original question was why the large round sundial at the top of the wall was showing a time several hours different from clock time, ..........
in July 2002 when we saw it from the top of the Royal Palace, while looking at the Royal Palace tower clock. I was not aware there were other sundials lower down. Being in a group looking at tower clocks, I was unable stop to go over to the church. Does anyone know why the difference ? David > > From: Thibaud Taudin-Chabot <[EMAIL PROTECTED]> > Date: Wed 18/Sep/2002 22:31 CEST > To: [email protected] > Subject: Re: Amsterdam sundial > > John and others, > Today I finally got the oppurtunity to check the 2 Amsterdam sundials on > the New Church in the centre of the city. > The churchwall is roughly declining 12° to the east. The big round sundial > is mounted flat to the wall. So the style of the big dial is pointing to > the left (seen from below) of the XII mark. > The small sundial is however turned 12° to the west so it becomes a perfect > south facing sundial. > Standing directly beforebelow the two dials it is easy to see that the > style of the small one is bent eastwards. It should be perpendicular to the > dialface which can be deduced from the fact that the bottom mount of the > style is directly below the XII mark. > The style of the east dialface and the style of the west dialface are both > missing. I wonder whether they have ever been present. > It is a pity I didn't see the bent style when I made a very nice picture of > it using the scaffolding when the wall was being cleaned. > Thibaud Chabot > > > At 07:44 28-07-2002 -0700, you wrote: > >Fer > > > >The Amsterdam dial(s) bothered me when I saw it. My memory isn't so good but > >it was a cloudy day and I didn't have a watch. But if I remember the dials > >showed different times, and their construction was different in style > >position and face design. > > > >Do you know somebody in the Dutch Sundial Society that lives in Amsterdam > >who could go to the church and get us some photographs? We need a photo > >showing both dials and need to know watch time photo is taken. Or the next > >time you're in the big city, you could take a look and settle the debate. > > > >John > > > >John L. Carmichael Jr. > >Sundial Sculptures > >925 E. Foothills Dr. > >Tucson Arizona 85718 > >USA > > > >Tel: 520-696-1709 > >Email: [EMAIL PROTECTED] > >Website: <http://www.sundialsculptures.com> > >----- Original Message ----- > >From: "fer j. de vries" <[EMAIL PROTECTED]> > >To: "sundial" <[email protected]> > >Sent: Sunday, July 28, 2002 4:04 AM > >Subject: Re: Some ideas for constructing sundials > > > > > > > Hello Valentin, > > > > > > Welcome to the list and thanks for your contribution. > > > > > > I downloaded your postscript file and calculated a Quadrant sundial. > > > In fact these are portable sundials and you may find them in several > >shapes. > > > The program worked well and thanks for sharing it with us.. > > > > > > About the Amsterdam sundials: > > > You stated: > > > > > > > The face of a "classical" sundial is the projection of a SINGLE POINT, > > > > which is at some distance from the surface (usially flat). Therefore THE > > > > BASIC POINT OF THE STYLE IS IRRELEVANT !!! > > > > > > In fact this is correct, however the Amsterdam sundials are dials with a > > > pole style as shadow caster and the dial may be read with the entire line > >of > > > shadow of that pole style. > > > For such dials the pole styles MUST be parrallel, even for a dial in > > > Amsterdam and Harare. > > > > > > But the remark was that the styles weren't parallel. > > > This could be because one of the styles wasn't mounted correct, as stated > > > before. > > > > > > Another reason can be as it looks like the styles aren't parallel. > > > The circular dial in top of the chursh is directly mounted to the wall > >which > > > wall declines some degrees to the east. > > > The smaller dial at another spot of the same wall is a south facing dial > >and > > > is angled to the wall with the same wall-declination. > > > So it might be an optical effect. > > > I haven't the correct answer, I just gave a possible reason. > > > > > > The smaller dial at this church in fact is a triple sundial. > > > It is a rather thick stone on which the south facing dial is drawn and on > > > the west and east side of the stone also a sundial is drawn. > > > > > > Best wishes, Fer. > > > > > > Fer J. de Vries > > > mailto:[EMAIL PROTECTED] > > > http://www.iae.nl/users/ferdv/ > > > Eindhoven, Netherlands > > > lat. 51:30 N long. 5:30 E > > > > > > ----- Original Message ----- > > > From: "Dr. Valentin Z. Hristov" <[EMAIL PROTECTED]> > > > To: <[email protected]> > > > Sent: Sunday, July 28, 2002 8:31 AM > > > Subject: Some ideas for constructing sundials > > > > > > > > > > Dear Dialists, > > > > > > > snip.... > > > > > > > > > > > > > > > - > > > > > > >- > > ----------------------------------------------------------------- > Th. Taudin Chabot, home email: [EMAIL PROTECTED] > > > - > _______________________________________________________________________ Freeserve AnyTime, only £13.99 per month with one month's FREE trial! For more information visit http://www.freeserve.com/time/ or call free on 0800 970 8890 -
