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--- Begin Message ---Well, at a minimum, there would be two cases: 1) where the crossings are co-linear 2) where they are not I assume the latter would never work? Where they are co-linear, it would seem that it would only give a single crossing point at a single solar elevation and time of day. Sent from my iPad > On Sep 3, 2020, at 4:34 AM, [email protected] wrote: > > Send sundial mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.uni-koeln.de/mailman/listinfo/sundial > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sundial digest..." > > > Today's Topics: > > 1. Fake "trifilar" Sun Dial? (Siegfried Netzband) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 3 Sep 2020 10:34:15 +0200 (CEST) > From: Siegfried Netzband <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Fake "trifilar" Sun Dial? > Message-ID: > > <1599122055890.148710.5cb4a77174fa75af79b9d2668db68da397c6c...@spica.telekom.de> > > Content-Type: text/plain; charset="utf-8" > > 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: [email protected] > Skype: siegfried75233<http://www.ferienhaus-frieseneck.de> > > > > > > ? > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://lists.uni-koeln.de/mailman/private/sundial/attachments/20200903/c3f31705/attachment.html> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: SU Trifilar.JPG > Type: image/jpeg > Size: 31838 bytes > Desc: not available > URL: > <https://lists.uni-koeln.de/mailman/private/sundial/attachments/20200903/c3f31705/attachment.jpe> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > sundial mailing list > [email protected] > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > ------------------------------ > > End of sundial Digest, Vol 177, Issue 1 > ***************************************
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