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 <cerculdest...@gmail.com> 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 > > >
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