Dear Frans,
thank you so much for your mail with the attachments.You were of real help!
Google translator and the smartphone with Google voice translation, allways
right beside the computer, were of great help. However, as in most cases
with technical articles like that, I needed two complete translations, one
Duch/German and one Dutch/ English, and combined them to wind up with a
text version which made sense. Too many special terms which obviously only
may corectly be translated if you know the context they are used in.
Well, I am still struggling to fully understand the theory behind
the"Trifilar Sundial" of Bernard Rouxel. Bifilar sundials are interesting,
the trifilar sundial is even more so. Not beeing a matematician, the
"Hyperbolics" behind it are a real challenge (and unfortunately only
mentioned without details in the texts available to me). Also the
imagination you need to "see" the functionality of the trifilar
construction is quite hard. F. de Fries does an allmost perfect job using
that in explaining the dial. May be some day someone comes up with a text
or even a simulation or an explanatory fil on YouTube which makes it easier
for the "average sun dial layman" to fully get his or her grips on that
sundial.
It certainly is not a "Faike Trifilar Sundial" as I wrongly named it when I
first saw it and asked for help here. It is, with many respects, a quite
challenging sundial which deserves to be looked into and dealt with by the
sundialist community. It was "invented" about 10 years ago and I am glad to
have found it, though only now and only by accident.
Thank you again for your help.
With 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<http://www.ferienhaus-frieseneck.de>
-----Original-Nachricht-----
Betreff: Re: Fake "trifilar" Sun Dial?
Datum: 2020-09-14T17:47:16+0200
Von: "Maes, F.W." <f.w.m...@rug.nl>
An: "siegfried.netzb...@t-online.de" <siegfried.netzb...@t-online.de>
Dear Siegfried,
Attached is the original article by Fer de Vries, including the appendix. I
hope Google Translate works good enough for you to understand the text.
Best regards,
Frans
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On Mon, Sep 14, 2020 at 3:03 PM Siegfried Netzband <
siegfried.netzb...@t-online.de <mailto:siegfried.netzb...@t-online.de> >
wrote:
Dear Frans,
thanks again for your answer and the link provided. In the meantime I had
time to look up the link and the information behind it. By the way, the
link did also lead me to some phantastic informations.
Well, I must admitt that I do not understand the theory behind the
Trifilar Sundial. I tried therefore to find more about it.
F. de Vries writes in "Contents of Bulletin 97, May 2008": ...The
appendix give practical construction calculations.....". Would you have
any idea where that may be found? He also must have investigated the dial
quite a bit because he indicates figures of the inclination and
declination of the dial in the picture (?).
Bifilar dials are interesting, but this trifilar dial is even more so. I
would really learn more about the theory behind it. So, be so kind and
try to help.
Thanks a lot 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<http://www.ferienhaus-frieseneck.de>
-----Original-Nachricht-----
Betreff: Re: Fake "trifilar" Sun Dial?
Datum: 2020-09-03T14:49:11+0200
Von: "Maes, F.W." <f.w.m...@rug.nl <mailto:f.w.m...@rug.nl> >
An: "siegfried.netzb...@t-online.de
<mailto:siegfried.netzb...@t-online.de> " <
siegfried.netzb...@t-online.de <mailto:siegfried.netzb...@t-online.de> >
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<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<http://www.ferienhaus-frieseneck.de>
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