It's an amazing device, especially for its time, & its mechanical-construction. I'd never heard of it till today.
When you google "Giovanni Antonio Amedeo Plana, perpetual calendar, Turin", select the google link that says: " The mechanism of Plana's Calendar - IMEKO That looks like more than a magazine-article, & looks to have a more detailed description of the device. Michael Ossipoff <https://www.imeko.org/publications/tc4-Archaeo-2017/IMEKO-TC4-ARCHAEO-2017-008.pdf> On Sat, Sep 24, 2022 at 1:22 PM graham stapleton via sundial < sundial@uni-koeln.de> wrote: > 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. > > > ---------- Forwarded message ---------- > From: graham stapleton <manaeus2...@yahoo.co.uk> > To: "sundial@uni-koeln.de" <sundial@uni-koeln.de> > Cc: > Bcc: > Date: Sat, 24 Sep 2022 17:22:31 +0000 (UTC) > Subject: Perpetual Calendar of Giovanni Antonio Amedeo Plana > While calendars are a current topic, please can anyone direct me to > detailed information about the Perpetual Calendar created by Giovanni > Antonio Amedeo Plana, located in Turin. > > I have discovered a paper: IMEKO-TC4-ARCHAEO-2017-008.pdf > <https://www.imeko.org/publications/tc4-Archaeo-2017/IMEKO-TC4-ARCHAEO-2017-008.pdf> > but > it has few details. Apparently the University of Turin team built both a > physical replica and a digital version, I have not found any references to > these. > > Graham Stapleton > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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