Dear Peter, I read your mail only today. I am pleased that you found the website in my homepage about the ,Tree of Sonius' from Fer de Vries and Jan Kragten, Eindhoven in the Molenvijverpark in Genk.
In the meantime Fer de Vries and Frans W. Maes have answered and explained the function of this special sundial. I thank Fer and Frans. Please write to me, if you still should have questions. Best wishes Karl Schwarzinger A-6073 Sistrans Austria 47°14´N - 11°27´E Tel./Fax : +43 - 512 - 378868 [EMAIL PROTECTED] http://members.aon.at/sundials ----- Original Message ----- From: "Peter Mayer" <[EMAIL PROTECTED]> To: <sundial@rrz.uni-koeln.de> Sent: Friday, November 19, 2004 4:32 AM Subject: 'Wineglass' of Sonius > Hi, > > I've been thinking for some time about making dial on the model of > the "Tree of Sonius" in Limburg, Belgium (see Karl Schwarzinger's great > homepage: http://members.tirol.com/k.schwarzinger/b_5650.htm for a > picture of the dial and a very clear diagram illustrating the principle > of the dial. Thanks Karl!). Since my model will be for the southern > hemisphere, but is to be read 'left to right' it will have to be > 'bowl-shaped' (or as I prefer to think of it, 'wineglass-shaped'!) > rather than 'umbrella-shaped' as is the Limburg original. > My question to the group is: what is the simplest, most sensible way > with a modest kit of hand/power tools to cut the complex shadow plane > slots for each hour? > My present thinking suggests i) drawing a normal vertical dial for > my location on the north face, then ii)'extending' the angle of the > style (from the 6 o'clock line) across the side of the block which > constitutes the dial and using the intersection of the style extension > with the south side of the block to position and draw a second vertical > dial--a mirror image, of course. Step iii) is to connect the respective > hour lines on the two faces across the edges. Step iv) would be to > successively align the block so that each hour plane is vertical and use > a mitre box to cut the shadow plane slots. > Since Fer de Vries co-designed the original, I'm sure he'll have a > far more sensible plan! (How on earth was it done in stainless steel??) > > Many thanks, > > Peter Mayer > > -- > Peter Mayer > Politics Department > Adelaide University, AUSTRALIA 5005 > Ph : +61 8 8303 5606 > Fax : +61 8 8303 3446 > e-mail: [EMAIL PROTECTED] > > ----------------------------------------------------------- > This email message is intended only for the addressee(s) > and contains information which may be confidential and/or > copyright. If you are not the intended recipient please > do not read, save, forward, disclose, or copy the contents > of this email. If this email has been sent to you in error, > please notify the sender by reply email and delete this > email and any copies or links to this email completely and > immediately from your system. No representation is made > that this email is free of viruses. Virus scanning is > recommended and is the responsibility of the recipient. > > > - > -
