Re: Bifilar Again!
Hello Sarah, The 2 threads or edges may be straight or curved and may have any orientation. As long as there are 2 shadows of which the intersectionpoint is used as the point where to read the dial I call the dial a bifilar dial. This is based on historical reasons as I wrote in another message. The original idea by Micknik was a dial with equiangular hourlines. New ideas with one curved thread and one straight thread give dials with parallel datelines or with parallel hourlines. Many other ideas are just for fun to show what happens with the patterns. Theoretical it is possible to use 2 curved threads or edges, however I never saw such a dial. With 1 curved thread a number of examples may be found in literature and even there is an example with 2 cylinders as shadowcasters. Best wishes, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E - Original Message - From: Sarah Edmondson-Jones <[EMAIL PROTECTED]> To: ; John Davis <[EMAIL PROTECTED]> Sent: Saturday, October 21, 2000 5:46 PM Subject: Re: Bifilar Again! > Hello John et al, > I'm still trying to come to grips with the possibilities that bifilar dials > offer. Is it necessary for the 'lines/wires/planes' that cast the shadow to > be parallel with the dial plate? > best wishes > Sarah Edmondson-Jones > >
Re: Motto in Corsica
Hello, That is latin indeed, but the normal spelling should be : Ora ne TE fallat hora And the translation is : Pray, in order the hour does not deceive you (in french : prie , pour que l'heure ne te trompe) Found in the french book by Boursier (out of print) : Huit cent devises de cadrans solaires (Eight hundred sundials mottoes) Best regards Jean-Paul Cornec LANNION FRANCE 48°44'20" N 3°27'32" W Cadrans Solaires de Bretagne : http://perso.wanadoo.fr/jean-paul.cornec/index.html
Re: Bifilar Again!
Hello John et al, I'm still trying to come to grips with the possibilities that bifilar dials offer. Is it necessary for the 'lines/wires/planes' that cast the shadow to be parallel with the dial plate? best wishes Sarah Edmondson-Jones
Program ZW2000
Dear All, A new version of the program Zw2000 is now available. It has a new feature to draw date marks on (half) analemmas as recently was asked for. The version is numbered 1.1 , november 2000. In the manual a paragraph for this new feature and a figure 18 are added. The figure 18 also is attached to this e-mail. Enjoy the new version and send me your comments. Fer. Download the program: ftp://iaehv.nl/pub/users/ferdv/zw2000v1_1.zip Download the manual ( htm document ): ftp://iaehv.nl/pub/users/ferdv/manualv1_1.zip Or read the manual on line: http://www.iaehv.nl/users/ferdv/zw2000.htm Fer J. de Vries[EMAIL PROTECTED]http://www.iae.nl/users/ferdv/Eindhoven, Netherlandslat. 51:30 N long. 5:30 E Attachment converted: Macintosh HD:zw2000-18.gif (TIFF/JVWR) (0001DB8C)
[no subject]
> >From [EMAIL PROTECTED] Fri Oct 20 22:32:25 2000 >Received: from uqac.uquebec.ca (poste.uqac.uquebec.ca [132.212.11.73]) > by mail1.rrz.Uni-Koeln.DE (8.9.3/8.9.3) with ESMTP id WAA10380 > for ; Fri, 20 Oct 2000 22:32:25 +0200 > (MET DST) >Received: from depcom.uqac.uquebec.ca (depcom.uqac.uquebec.ca [132.212.200.4]) > by uqac.uquebec.ca (8.9.3+Sun/8.9.1) with ESMTP id QAA25673 > for ; Fri, 20 Oct 2000 16:26:51 -0400 (EDT) >Received: from chantale-dumas.uqac.uquebec.ca (dsasecdocing [132.212.203.67]) > by depcom.uqac.uquebec.ca (8.9.1b+Sun/8.9.1) with SMTP id QAA19095 > for ; Fri, 20 Oct 2000 16:24:53 -0400 (EDT) >Message-Id: <[EMAIL PROTECTED]> >X-Sender: [EMAIL PROTECTED] >X-Mailer: Windows Eudora Light Version 3.0.1 (32) >Date: Fri, 20 Oct 2000 16:30:55 -0400 >To: sundial@rrz.uni-koeln.de >From: Chantale Dumas <[EMAIL PROTECTED]> >Subject: translation of latin motoe >Mime-Version: 1.0 >Content-Type: text/plain; charset="us-ascii" > >Hi All, > >I need help to translate the following motoe > >ORA (or ERA) NE LE FALLAT HORA > >It not seems to be academic Latin, perhaps Corsican. >(Sundial on the wall of Couvent St-Francois, at Vico, Corsica). Any >information about it is welcome. Thank you in advance. > >Chantale Dumas Sender: [EMAIL PROTECTED] Precedence: bulk
Re: Bifilar Again!
Hello Claude, Micknik developed the bifilar dial in the 1920's. 2 straight threads, parallel to an horizontal plane, were used as shadow casters. He named this dial a bifilar dial. Also in German the word is bifilar, however the pronunciation is some different. For historical reasons I think it is important to keep this name for this kind of a sundial. In stead of 2 threads also 2 edges of planes may be used as shadow casters, but still I suggest to use the word bifilar dial. There is no fundamental change in the concept of the dial. In the 1970's and 1980's new dials appeared in which one of the threads or edges is no longer straight but has a curved shape to get other patterns for the lines on the sundial. To my opinion these dials still are bifilar dials because the principle isn't changed: the dial has to be read at the intersectionpoint of 2 shadows of 2 threads or edges. However, I realize that naming and classifying sundials is a difficult matter in gnomonics. Best wishes, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E - Original Message - From: Claude Hartman <[EMAIL PROTECTED]> To: sundial list Sent: Friday, October 20, 2000 1:06 PM Subject: Bifilar Again! > Many of you may remember a thread on this list in March of this year > about the "bifilar" name. (I tried to look for it on the AstroArchive > site but I > could not do a search for titles or keywords. The egroup site is much > better: http://www.egroups.com/group/sundial) > > There seems to be continuing concern for the use of this name. As > before, there seems to be no other reason to refer to these non-linear > gnomons as "bifilar" other than the total lack of any better > terminology! The new BSS glossary does not even list the term, > "bifilar". > > After much consideration, I think a better term would be "bi-gnomon". > > This would help relate to the use of "bifilar" which seems to have been > used since 1920 but improve and broaden the definition. As Chris Lusby > Taylor wrote: > >Many recent so-called bifilar sundials merely use the > >intersection of the shadows of two rather arbitrary lines/curves. > > We might use the term "intersecting gnomon" or "bi-style" except that it > seems clumsy. If we accept the definition of gnomon as any type of > shadow casting object, we have a description of the physical dial. > > My thanks to Frans Maes for the posting of more views of the Appingedam > dial and the English translation. He has produced a very richly > illustrated site with valuable references. > > Claude Hartman > 35N 120W > >
Re: Bifilar Again!
Hi Claude, You wrote: >The new BSS glossary does not even list the term, > "bifilar". This is not so - it is there under "dial types", and reads: bifilar ~: invented in 1922 by Hugo Michnik in its horizontal form, although it can be on any plane. The time is indicated by the intersection on the dial plate, of the shadows of two wires (or other lines in space) stretched above and parallel to it. The wires often run E-W and N-S, with their (different) heights above the plane being a function of the location of the dial. It may have equiangular hour markings, and hence can be delineated to show many kinds of hours. Whilst we might discuss whether the definition needs extending to cover non-straight wires, I think this covers the most usual forms, Regards, John Dr J R Davis Flowton, UK 52.08N, 1.043E email: [EMAIL PROTECTED]
