Re: portable sundial
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- the earliest mention I know of a ring dial was written by Leonardo da Vinci in a leaflet of errands given to one of his workshop assistants. This leaflet reads, among other errands: “Show the Serigatto (Francesco Serigatti) the book and get him to give you the rule of the ring sundial’. As far as I know, the ring dial is described by Najim al Din in an Arabic manuscript from 1309, obviously with the use of the temporal hours. However, in European manuscripts this particular clock does not appear until the 15th century and already with the same, European hours. Mario Arnaldi From: Schechner, Sara Sent: Sunday, September 29, 2024 4:56 PM To: Donald Christensen Cc: Sundial mailing list Subject: RE: portable sundial Dear Donald, The proper name for this type of altitude sundial is “ring dial.” Please do not refer to it as an Aquitaine ring or farmer’s ring. Those were marketing names used by a modern jeweler. Many museum collections have ring dials, including those at the Adler Planetarium in Chicago, the National Maritime Museum of Greenwich, the Science History Museum in Oxford, and others. Most are very simple but others can be mathematically complex and be adjustable for latitude and season. I believe R. Newton Mayall and Margaret Mayall give instructions on the arrangement of hour lines in their book, Sundials. Good luck with your project. Sara Sara J. Schechner, PhD, FAAS Curator Emerita, Collection of Historical Scientific Instruments, Harvard University President, IAU Commission C3 (History of Astronomy) President, IAU-IUHPST Inter-Union Commission for History of Astronomy (ICHA) sara_schech...@comcast.net sche...@fas.harvard.edu From: sundial On Behalf Of Donald Christensen Sent: Sunday, September 29, 2024 2:10 AM To: Steve Lelievre Cc: Sundial mailing list Subject: Re: portable sundial Thanks for the info. Do you know where I can find the mathematical calculations? I'd like to make one Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre wrote: Hi, It sounds to me like a reference to what is sometimes called an Aquitaine Ring (because of a story that Elenor of Aquitaine gave one to her husband to be). Also known as a Farmer’s Ring. Modern ones are readily available. Just search the internet for “Aquitaine Ring” Steve On Sat, 28 Sep 2024 at 20:53, Donald Christensen wrote: In the book, Sundials: Their Theory and Construction Paperback – 1 June 1973 by ALBERT WAUGH (Author) He explained a portable sundial that worked similar to a shepard’s dial. Instead of a gnomon that cast a shadow on the pillar, this looked more like a ring. Instead of a shadow that told the time, a beam of light showed through a hole in the ring. There were groves on the inside of the ring. Time was read by inspecting wherever the beam of light touched one of these grooves. The ring would hang from a string. Does anyone have any information about this sundial? Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- Questa email è stata esaminata alla ricerca di virus dal software antivirus Avast. www.avast.com--- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Dear Ali, on my knowledge there do not exist ring dials, which indicate correct time in different latitudes. But of course, one could construct a ring with 2 scales for 2 different latitudes, one scale next to the other on the inner surface of the ring. A moveable pin hole and one scale could be an accaptable approximation for two different latitudes in some special cases helmut sonderegger www.helson.at Am 29.09.2024 um 19:39 schrieb guerbabi ali via sundial: Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment. --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hi Sara and all the members of the list, The ring dial, indeed a good exemple of altitude sundial and elementary principles of gnomonics applied for a given latitude. But for a device intended for different latitudes I suppose that it must be constituted by several (2, 3 or 4?) imbricated rotating parts, how are they combined to get some thing working without dislocating? Ali Guerbabi 35.546 N 6.16 E Le dimanche 29 septembre 2024 à 15:57:20 UTC+1, Schechner, Sara a écrit : Dear Donald, The proper name for this type of altitude sundial is “ring dial.” Please do not refer to it as an Aquitaine ring or farmer’s ring. Those were marketing names used by a modern jeweler. Many museum collections have ring dials, including those at the Adler Planetarium in Chicago, the National Maritime Museum of Greenwich, the Science History Museum in Oxford, and others. Most are very simple but others can be mathematically complex and be adjustable for latitude and season. I believe R. Newton Mayall and Margaret Mayall give instructions on the arrangement of hour lines in their book,Sundials. Good luck with your project. Sara Sara J. Schechner, PhD, FAAS Curator Emerita, Collection of Historical Scientific Instruments, Harvard University President, IAU Commission C3 (History of Astronomy) President, IAU-IUHPST Inter-Union Commission for History of Astronomy (ICHA) sara_schech...@comcast.net sche...@fas.harvard.edu From: sundial On Behalf Of Donald Christensen Sent: Sunday, September 29, 2024 2:10 AM To: Steve Lelievre Cc: Sundial mailing list Subject: Re: portable sundial Thanks for the info. Do you know where I can find the mathematical calculations? I'd like to make one Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre wrote: Hi, It sounds to me like a reference to what is sometimes called an Aquitaine Ring (because of a story that Elenor of Aquitaine gave one to her husband to be). Also known as a Farmer’s Ring. Modern ones are readily available. Just search the internet for “Aquitaine Ring” Steve On Sat, 28 Sep 2024 at 20:53, Donald Christensen wrote: In the book, Sundials: Their Theory and Construction Paperback – 1 June 1973 by ALBERT WAUGH (Author) He explained a portable sundial that worked similar to a shepard’s dial. Instead of a gnomon that cast a shadow on the pillar, this looked more like a ring. Instead of a shadow that told the time, a beam of light showed through a hole in the ring. There were groves on the inside of the ring. Time was read by inspecting wherever the beam of light touched one of these grooves. The ring would hang from a string. Does anyone have any information about this sundial? Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Hi, If you own the NASS Repository CD, look through the back issues of The Compendium for an article "Ring Dials (Farmers' Rings)" by Helmut Sonderegger in issue 12(3), September 2005, pp.32-39. If you're not actually interested in the math and prefer to get right to making one, then run up Helmut's sundial design software for PCs, which is called Sonne. One of facilities is to draw this type of dial in flat form which you have to wrap into a cylinder shape. There may be other software around that also does the job, Sonne is the one I happen to know. Steve On 2024-09-28 11:09 p.m., Donald Christensen wrote: Thanks for the info. Do you know where I can find the mathematical calculations? I'd like to make one Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre wrote: Hi, It sounds to me like a reference to what is sometimes called an Aquitaine Ring (because of a story that Elenor of Aquitaine gave one to her husband to be). Also known as a Farmer’s Ring. Modern ones are readily available. Just search the internet for “Aquitaine Ring” Steve On Sat, 28 Sep 2024 at 20:53, Donald Christensen wrote: In the book, Sundials: Their Theory and Construction Paperback – 1 June 1973 by ALBERT WAUGH (Author) He explained a portable sundial that worked similar to a shepard’s dial. Instead of a gnomon that cast a shadow on the pillar, this looked more like a ring. Instead of a shadow that told the time, a beam of light showed through a hole in the ring. There were groves on the inside of the ring. Time was read by inspecting wherever the beam of light touched one of these grooves. The ring would hang from a string. Does anyone have any information about this sundial? Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- https://www.gnomoni.ca https://www.youtube.com/@gnomonica --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hi Donald, An alternative name for the ring dial is the ‘poke dial’, i.e. a pocket dial. The simplest form was very common as evidenced by the fact that it is by far the most frequently reported to the Portable Antiquities Scheme (run by the British Museum) by English metal detectorists. The last time I counted, there were nearly 100 in the database. Needless to say, most are damaged or incomplete. Regards, John Davis ———- Dr J Davis BSS Editor http://sundialsoc.org.uk/publications/the-bss-bulletin/ > On 29 Sep 2024, at 07:09, Donald Christensen > wrote: > > Thanks for the info. Do you know where I can find the mathematical > calculations? I'd like to make one > Cheers > Donald Christensen > 0467 332 227 > > If you focus on what you lack, you'll lose what you have. If you focus on > what you have, you gain what you lack. > > >> On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre >> wrote: >> Hi, >> >> It sounds to me like a reference to what is sometimes called an Aquitaine >> Ring (because of a story that Elenor of Aquitaine gave one to her husband to >> be). Also known as a Farmer’s Ring. >> >> Modern ones are readily available. Just search the internet for “Aquitaine >> Ring” >> >> Steve >> >> >> >>> On Sat, 28 Sep 2024 at 20:53, Donald Christensen >>> wrote: >>> In the book, >>> Sundials: Their Theory and Construction Paperback – 1 June 1973 >>> by ALBERT WAUGH (Author) >>> >>> He explained a portable sundial that worked similar to a shepard’s dial. >>> Instead of a gnomon that cast a shadow on the pillar, this looked more like >>> a ring. Instead of a shadow that told the time, a beam of light showed >>> through a hole in the ring. There were groves on the inside of the ring. >>> Time was read by inspecting wherever the beam of light touched one of these >>> grooves. The ring would hang from a string. >>> >>> Does anyone have any information about this sundial? >>> >>> Cheers >>> Donald Christensen >>> 0467 332 227 >>> >>> If you focus on what you lack, you'll lose what you have. If you focus on >>> what you have, you gain what you lack. >>> --- >>> https://lists.uni-koeln.de/mailman/listinfo/sundial >>> > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > --- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: portable sundial
Dear Donald, The proper name for this type of altitude sundial is “ring dial.” Please do not refer to it as an Aquitaine ring or farmer’s ring. Those were marketing names used by a modern jeweler. Many museum collections have ring dials, including those at the Adler Planetarium in Chicago, the National Maritime Museum of Greenwich, the Science History Museum in Oxford, and others. Most are very simple but others can be mathematically complex and be adjustable for latitude and season. I believe R. Newton Mayall and Margaret Mayall give instructions on the arrangement of hour lines in their book, Sundials. Good luck with your project. Sara Sara J. Schechner, PhD, FAAS Curator Emerita, Collection of Historical Scientific Instruments, Harvard University President, IAU Commission C3 (History of Astronomy) President, IAU-IUHPST Inter-Union Commission for History of Astronomy (ICHA) sara_schech...@comcast.net<mailto:sara_schech...@comcast.net> sche...@fas.harvard.edu<mailto:sche...@fas.harvard.edu> From: sundial On Behalf Of Donald Christensen Sent: Sunday, September 29, 2024 2:10 AM To: Steve Lelievre Cc: Sundial mailing list Subject: Re: portable sundial Thanks for the info. Do you know where I can find the mathematical calculations? I'd like to make one Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre mailto:steve.lelievre.can...@gmail.com>> wrote: Hi, It sounds to me like a reference to what is sometimes called an Aquitaine Ring (because of a story that Elenor of Aquitaine gave one to her husband to be). Also known as a Farmer’s Ring. Modern ones are readily available. Just search the internet for “Aquitaine Ring” Steve On Sat, 28 Sep 2024 at 20:53, Donald Christensen mailto:dchristensen...@gmail.com>> wrote: In the book, Sundials: Their Theory and Construction Paperback – 1 June 1973 by ALBERT WAUGH (Author) He explained a portable sundial that worked similar to a shepard’s dial. Instead of a gnomon that cast a shadow on the pillar, this looked more like a ring. Instead of a shadow that told the time, a beam of light showed through a hole in the ring. There were groves on the inside of the ring. Time was read by inspecting wherever the beam of light touched one of these grooves. The ring would hang from a string. Does anyone have any information about this sundial? Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. --- https://lists.uni-koeln.de/mailman/listinfo/sundial<https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.uni-2Dkoeln.de_mailman_listinfo_sundial&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo&m=-SrZOYJ-paV1yxzcIhs8m-_Dma17c80GrTmCC9S0oSfYMgF0wYsciPcALYg3pDSS&s=QJYZ6mQiZlB_t7621yVCIb3zcYIJfssk3k9lb6aMIlA&e=> --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Thanks for the info. Do you know where I can find the mathematical calculations? I'd like to make one Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. On Sun, Sep 29, 2024 at 3:29 PM Steve Lelievre < steve.lelievre.can...@gmail.com> wrote: > Hi, > > It sounds to me like a reference to what is sometimes called an Aquitaine > Ring (because of a story that Elenor of Aquitaine gave one to her husband > to be). Also known as a Farmer’s Ring. > > Modern ones are readily available. Just search the internet for “Aquitaine > Ring” > > Steve > > > > On Sat, 28 Sep 2024 at 20:53, Donald Christensen < > dchristensen...@gmail.com> wrote: > >> In the book, >> >> Sundials: Their Theory and Construction Paperback – 1 June 1973 >> >> by ALBERT WAUGH (Author) >> >> >> He explained a portable sundial that worked similar to a shepard’s dial. >> Instead of a gnomon that cast a shadow on the pillar, this looked more like >> a ring. Instead of a shadow that told the time, a beam of light showed >> through a hole in the ring. There were groves on the inside of the ring. >> Time was read by inspecting wherever the beam of light touched one of these >> grooves. The ring would hang from a string. >> >> >> Does anyone have any information about this sundial? >> >> Cheers >> Donald Christensen >> 0467 332 227 >> >> If you focus on what you lack, you'll lose what you have. If you focus on >> what you have, you gain what you lack. >> --- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> >> --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Hi, It sounds to me like a reference to what is sometimes called an Aquitaine Ring (because of a story that Elenor of Aquitaine gave one to her husband to be). Also known as a Farmer’s Ring. Modern ones are readily available. Just search the internet for “Aquitaine Ring” Steve On Sat, 28 Sep 2024 at 20:53, Donald Christensen wrote: > In the book, > > Sundials: Their Theory and Construction Paperback – 1 June 1973 > > by ALBERT WAUGH (Author) > > > He explained a portable sundial that worked similar to a shepard’s dial. > Instead of a gnomon that cast a shadow on the pillar, this looked more like > a ring. Instead of a shadow that told the time, a beam of light showed > through a hole in the ring. There were groves on the inside of the ring. > Time was read by inspecting wherever the beam of light touched one of these > grooves. The ring would hang from a string. > > > Does anyone have any information about this sundial? > > Cheers > Donald Christensen > 0467 332 227 > > If you focus on what you lack, you'll lose what you have. If you focus on > what you have, you gain what you lack. > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: portable sundial
Hi Angelo Have a look at: http://www.cris.com/~stircraz They have portable ring sundials for around US$25.00. Please note that this web site does not show you how to calculate them. When you find out would you also let me know how? Roderick Wall. -- ___ Roderick Wall E-mail: [EMAIL PROTECTED] Melbourne Australia.
