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 - 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> 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 > > Skype: siegfried75233 > > www.ferienhaus-frieseneck.de > > > > > > > > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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