Sundials on glass surfaces are challenging. The ideal surface to show a shadow is matte and opaque. Shadows cannot be seen on clear glass or mirrors. With semi-opaque glass, a shadow can be seen on both the sunny side and underside. But many factors can lower the contrast: reflection, translucence, opacity as well as the usual sundial problems with haze and penumbra fuzziness. I am advising a client on large vertical declining sundial on a glass curtain wall. The shadow is to be visible on both the sunny outside and the dim inside surface of the glass. On this project frit* is to be silk screened and fused onto the glass to provide the pattern, lines and desired opacity. It is an interesting design project. Stay tuned.
Roger Bailey Walking Shadow Designs *see http://en.wikipedia.org/wiki/Frit#Modern_uses_of_frit From: Chiu ?,Chi lian Sent: Monday, March 25, 2013 10:21 PM To: Reinhold Kriegler ; Sundial sundiallist Subject: Re: A glass in Taiwan Dear Reinhold, Sorry for the smallness of the picture attached in the last mail for I was worrying about the size limit last night. The above ground construction of the landmark body, a pair of strange shaped art pieces, is just half done up to now. That is only one piece of the pair is very close to the finishing as shown in the attachment of this mail. Unfortunately, that is not the piece on which the glass sundial will be set up. The dial will be on the other one, which will be erected next month. The yellow sundial in the attached picture is just for giving you an idea how it will be up on the other coming piece of the pair. When the landmark structure is finished, people walking outside the structure can't see the dial because their sights are blocked by the arms of the structure. (It's done in this way deliberately to keep the outside view of the landmark as a piece of art.) When people walk inside the structure area, they'll find a dial above their head surprisingly. They can't see the gnomon plate but only its shadow on a sandblasted glass plate where only the hour lines are totally transparent. Financially speaking, the dial is built by a cooperation who won the government commission contract to build the landmark. Yes, I helped them in proposing the idea of moving the dial from the narrow, over-crowded ground up to the sky, in calculations and model examination. >From now, I will make sure they install it right. For more information you may try http://blog.xuite.net/nycl.chiu/blog/63325424 and http://blog.xuite.net/nycl.chiu/blog/66026604 They are written in Chinese, but I think the pictures there will tell you everything essential. Your homepage is great. I wish I could have one like yours. Regards, ChiLian N25, E125 2013/3/26 Reinhold Kriegler <[email protected]> Dear ChiLian Chiu! Thank you very much for this very rare information from Taiwan. Did you build this sundial? I do not understand quite well how it works, but perhaps will see with a bigger image… Would it be possible to get a higher resolution picture in order to see the details better? I am sure you will soon get several answers from US-American glass sundial fans! Good wishes to you! Reinhold Kriegler You are invited to have a look at my homepage www.ta-dip.de ! * ** *** **** ***** ****** ******* Reinhold R. Kriegler Lat. 53° 6' 52,6" Nord; Long. 8° 53' 52,3 Ost; 48 m ü. N.N. GMT +1 (DST +2) www.ta-dip.de http://de.youtube.com/watch?v=XyCoJHwzzjU&fmt=18 http://www.ta-dip.de/dies-und-das/r-e-i-n-h-o-l-d.html http://www.ta-dip.de/salon-der-astronomen/musik-im-salon-der-astronomen.html -----Ursprüngliche Nachricht----- Von: sundial [mailto:[email protected]] Im Auftrag von Chiu ªô,Chi lian Gesendet: Montag, 25. März 2013 19:41 An: [email protected] Betreff: A glass in Taiwan Hi, dear members: A new glass sundial, close to horizontal type, but inclined due west by 10 degrees, is going to be installed in JiaYi, Taiwan next month. The dial will be put up to fit in an empty space, 6 meter high from the ground, of a landmark structure, which is shown in the attached diagram. The yellow oval-shaped area in the diagram is the place the dial will be installed. To view the shadow of the gnomon on the glass dial plate, one has to be under it and look upward to his top. To this point, it is unlike those normal window dials, which one just needs to look front or with an angle not too high. This is what beyong my knowledge: is there any dial of this kind (glass and look upward to one's top) around already? Please help. Best regards, ChiLian Chiu N25, E125, Hsinchu, Taiwan -------------------------------------------------------------------------------- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial -------------------------------------------------------------------------------- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3267 / Virus Database: 3161/6204 - Release Date: 03/25/13
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