Sorry, sent again with the right email address for the sundials list. A
From: Alastair Hunter <sundi...@macmillanhunter.co.uk> Sent: 07 September 2020 18:21 To: 'Maes, F.W.' <f.w.m...@rug.nl> Cc: 'Sundial Mailing List' <sundial@uni-koeln.de> Subject: Fer's legacy - diptych Dear Frans Thank you very much for your reply. I can only imagine the time and effort all of you have put into making Fer’s legacy available in data form and in English. It is terrific! The diptych concave is, I think, not a simple mathematical problem. I have done it by 3D drawing but it needs great care to avoid errors. I suspect the Nuremberg makers had their own tried and tested methods. Best wishes Alastair ______________________________________________________________ Macmillan Hunter Sundials, 3 Peel Terrace, Edinburgh EH9 2AY, Scotland, UK Telephone: 44 0 131 468 2616 Email: <mailto:sundi...@macmillanhunter.co.uk> sundi...@macmillanhunter.co.uk Website: <https://www.macmillanhunter.co.uk/> https://www.macmillanhunter.co.uk/ ______________________________________________________________ From: Maes, F.W. <f.w.m...@rug.nl <mailto:f.w.m...@rug.nl> > Sent: 07 September 2020 16:52 To: Alastair & Sheila <a...@3peel.co.uk <mailto:a...@3peel.co.uk> > Cc: Sundial Mailing List <sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> > Subject: Re: Fer's legacy - diptych Dear Alistair, I am glad you appreciate the effort we invested in saving the English version of Fer's legacy. Transmitting the original 360 Dutch articles from Fer's html-version into the CMS of our present website was quite a job. Repeating that for the 360 English articles (skillfully translated by our secretary Ruud Hooijenga) was beyond our stamina. The present solution, keeping the English html-files and linking to the database for the figures, appears to be a workable compromise. It might be interesting for the list members that the English summaries of the articles in our Bulletin from 1998 onward and its successor Zon & Tijd, are also available from the English section of our website, www.zonnewijzerkring.nl <http://www.zonnewijzerkring.nl> , via the link Journal Contents. As far as I know, Fer has not dealt with the construction of Bab. & Ital. hour lines in a concave saucer. Best regards, Frans Maes <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virusvrij. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> www.avg.com On Mon, Sep 7, 2020 at 3:44 PM Alastair & Sheila <a...@3peel.co.uk <mailto:a...@3peel.co.uk> > wrote: Hello Frans Your link to all the articles of Fer’s Legacy is wonderful. Thank you very much for telling us about it. I had already seen a copy of his article "Construction of hemispherium", showing how to generate Babylonian and Italian hour lines in a hemisphere bowl. Do you know if he described a method for doing the same lines in a spherical concave saucer, not a bowl, like the diptych dials by Reinman of Nuremberg and others? There must have been a method that worked, or was it custom and practice perhaps. Good wishes Alastair Hunter ______________________________________________________________ Macmillan Hunter Sundials, 3 Peel Terrace, Edinburgh EH9 2AY, Scotland, UK Telephone: 44 0 131 468 2616 Email: <mailto:sundi...@macmillanhunter.co.uk> sundi...@macmillanhunter.co.uk Website: <https://www.macmillanhunter.co.uk/> https://www.macmillanhunter.co.uk/ ______________________________________________________________ From: sundial <sundial-boun...@uni-koeln.de <mailto:sundial-boun...@uni-koeln.de> > On Behalf Of Maes, F.W. Sent: 03 September 2020 13:49 To: siegfried.netzb...@t-online.de <mailto:siegfried.netzb...@t-online.de> Cc: sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> Subject: Re: Fake "trifilar" Sun Dial? Dear Siegfried, Bernard Rouxel of France designed this original sundial. It got him second prize in the Italian "Le ombre del Tempo” contest of 2008. It was discussed by the late Fer de Vries in one of his online articles. That website does not exist anymore, but you can find his articles in "Fer's legacy": - Go to www.zonnewijzerkring.nl <http://www.zonnewijzerkring.nl> - Click the English flag - Click "Downloads" - At the bottom of the page, download the zip-file and unzip - Open "FersLegacy.html" The article is in the section "Article of the Month", November 2009. Enjoy! Best regards, Frans Maes On Thu, Sep 3, 2020 at 10:34 AM Siegfried Netzband <siegfried.netzb...@t-online.de <mailto:siegfried.netzb...@t-online.de> > wrote: Dear sundialists, found the attached picture in an old archive and do not have any details about it. The dial shown seems to be somethig like a "bifilar sundial with three straight wires". The wires obviously do not touch one another. The picture was taken at the moment when all wire shadows cross in one point on the dial face suggesting that the sundial shows the time at that moment (and any other?). There is no dial face visible. What kind of sun dial is that - what could be the idea behind it and it´s purpose? Is there anyboddy out threre who could answer the following questions and can help me to solve my problem, i.e. clarify that sun dial: - Has any one seen that picture before? If so, do you have any details about it? Please let me know. - The originator of that sun dial must have had some very special ideas when constructing that sun dial. To the best of my knowledge a picture like that where the shadows of three wires which do not touch one another, mounted at different heights and angles across the face of the dial, cross in one point on the face of the dial, can only be taken at at most 2 times a year, each time at exactly the same solar time. Am I right or does there realy exist something like a "trifilar sundial" as shown in the picture idicating time over the year? - Taking the sun dial shown to a singular, simplistic extreme: At whatever angles or hights multiple wires might run across a dial and touch each other at their crrossing point, the dial would simply work and could be calculated taking the crossing / touching point as the tip of the gnomon, the node of the dial. Correct? - Does any one know wether H. Michnik, the inventor of the bifilar sun dial and its theory in 1923, has made any mathematical statement about "multifilar sundails"? Thank you for your help and Kind Regards Siegfried Siegfried Netzband Hebelstr. 12 75233 Tiefenbronn Tel: 07234 2802 Fax: 07234 942909 Mob: 0151 53083636 / 0160 1531634 E-Post: siegfried.netzb...@epost.de <mailto:siegfried.netzb...@epost.de> Skype: siegfried75233 www.ferienhaus-frieseneck.de <http://www.ferienhaus-frieseneck.de> --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virusvrij. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> www.avg.com
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