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--- Begin Message ---Hi Peter, For a mathematical and practical analysis, see Ortwin Feustel, 'Ivory Sundials of Nuremberg Incorporating a Scaphe Sundial' BSS Bulletin 24(ii) 36-42. Regards, John------------------------ Dr J Davis Flowton Dials http://www.flowton-dials.co.uk/ BSS Editor http://sundialsoc.org.uk/publications/the-bss-bulletin/ On Tuesday, 7 April 2020, 12:07:28 BST, Peter Mayer <[email protected]> wrote: Hi, Dan-George Uza's recent post reminded me of a question I have. I was looking at Mark Lennox-Boyd's lovely Sundials the other day, especially photos of some of the beautiful Renaissance ivory diptychs, and realised that I didn't understand the principles behind the small scaphes on many dials. (Here's a Wikicommons photo of a Leonhard Miller dial). The Greek and Roman scaphes, like the one in Dan-George's photo, were hollow sections of either spheres or cones, with a gnomon at their centre. Their mode of operation seems quite straight-forward. But the scaphes in diptyches weren't like that. They appear to be tiny slices of much larger spheres. And the gnomons are, of course, far from the centre. The 'furniture' on several of them seems similar to stereographic projections. But, since instrument-makers then were well able to make astrolabes with stereographs, perhaps not. So: can someone point me to an article which discusses these small scaphes? Or, in the meantime, help me understand how and why they were used? Why don't we make them any more? Or: are there any contemporary examples, using, say, bowls, or bird-baths or skateboard parks? best wishes, Peter ----------- Peter Mayer Department of Politics & International Relations (POLIR) School of Social Sciences http://www.arts.adelaide.edu.au/polis/ The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 5609 Fax : +61 8 8313 3443 e-mail: [email protected] CRICOS Provider Number 00123M ----------------------------------------------------------- This email message is intended only for the addressee(s) and contains information that may be confidential and/or copyright. If you are not the intended recipient please notify the sender by reply email and immediately delete this email. Use, disclosure or reproduction of this email by anyone other than the intended recipient(s) is strictly prohibited. No representation is made that this email or any attachment are free of viruses. Virus scanning is recommended and is the responsibility of the recipient. -- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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