---------- Forwarded message ---------- From: John Davis via sundial <[email protected]> Date: 2018-08-10 18:16 GMT-04:00 Subject: To: Michael Ossipoff <[email protected]> Cc: Sundial List <[email protected]>
Only on flat planes, not inside scaphes........ > > J. > Okay, thanks. I didn't know what a scaphe was. I thought it was just a circle on the flat dial-plate. I didn't realize that it's concave. ...which would give it better hours-coverage for the Babylonian and Italian hours. Michael Ossipoff Dr J Davis Flowton Dials http://www.flowton-dials.co.uk/ BSS Editor http://sundialsoc.org.uk/publications/the-bss-bulletin/ On 10 Aug 2018, at 22:38, Michael Ossipoff <[email protected]> wrote: Sara and John-- But it's said that the hour-lines for Babylonian, Italian, and co-Italian hours are straight lines, as they are on all the other dials that I've seen that have Babylonian &/or Italian hours. Michael Ossipoff On Fri, Aug 10, 2018 at 4:37 PM, Schechner, Sara <[email protected]> wrote: > I am camping at Stellafane with little connection, so will keep this brief > until I return to civilization! > > The gnomon is adjustable for different latitudes. The choice determines > the correct horizontal scale to use around the compass. The 2 pin gnomon > scaphe sundial are for finding Italian and Babylonian (or Nuremberg > hours). The instrument with the spinning pointer is a wind vane. > The instrument is made in Nuremberg in the early 17th century. > > Sara > > Sent from my iPhone > > On Aug 10, 2018, at 12:48 PM, Michael Ossipoff <[email protected]> > wrote: > > Yes, the Boy Scouts of America at least used to sell a Compass-Oriented > Dyptich dial with several concentric rings, each having different > hour-lines, and with its string-gnomon adjustable for latitude, with > several attachment-points on the vertical surface. I think it accommodated > 3 latitudes. The hour-line rings were rectangular, it seems to me. > > Someone at this forum designed a universal Horizontal-Dial whose hour > lines were curved lines originating from the gnomon-string's > base-attrachment, with latitude-labeled concentric circles telling where to > read the hour lines for the various latitudes. ...and of course with the > string-gnomon slidable in a vertical slot in the vertical surface. > > Michael Ossipoff > > > > On Fri, Aug 10, 2018 at 4:22 AM, Dan-George Uza <[email protected]> > wrote: > >> Dear all, >> >> I've recently found this piece in a museum near me and I need your help >> in dating it. >> >> Why are the hour marks offset? I suspect a correction for latitude. And >> what do the two small circular dials on the bottom measure? >> >> Also what would be the purpose of the circular shape containing the >> alidade? I suspect it has something to do with the winds. >> >> Any info will be highly appreciated. >> >> Thank you, >> >> Dan Uza >> >> >> >> >> --------------------------------------------------- >> 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=3-DALhUvBQJn8P9cKR9FHS3EG06h7iYhIPEnqd_W0kI&s=ifZ07QqBi_JWsaekGzvK_IWYmTdGpp6kYF_t_p0_shI&e=> >> >> >> > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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