Dear Frank, I'm not sure if this follows Your idea, but I think the the answer, by Hans Troschel, is in the collection of History of Science Museum in Oxford.
Unfortunately no direct link is possible, so one has to use database search to find it: https://www.hsm.ox.ac.uk/database Diptych Dial, by Hans Troschel, Nuremberg, 1586 Inventory Number: 70006 And it certainly looks very conceptual and sophisticated, though the idea is incorporated into lower leaf - horizontal dial - only. If we look little wider, a crescent dial might be considered a "noon gap" equinoctial sundial as well ! Happy New Year, Maciej Lose Od: "Frank King" <f...@cl.cam.ac.uk> Do: sundial@uni-koeln.de; Wysłane: 9:51 Wtorek 2019-01-01 Temat: Gnomon Gap Puzzle > Dear All, > > Here is a little Dialling Puzzle to start > the New Year... > > We are all familiar with the term 'Noon Gap'. > On a simple horizontal sundial with a plate > gnomon, this is the gap on the dial plate > between the two vertical faces of the gnomon. > > On the dial plate, there are two lines for > 12 o'clock with the noon gap between. Often > this gap is left blank. Sometimes there is > a date or, perhaps, the maker's name. > > During the year just ended, I was asked to > design a dial which had to fit in a rather > unusual space. After a little thought, I > decided on a solution. In this... > > THE ENTIRE DIAL FITS INSIDE THE GNOMON GAP > > Question 1: What does the design look like? > > Question 2: Can this possibly look good? > > Question 3: What is the 'unusual space'? > > A Happy New Year to you all. > > Frank King > Cambridge, U.K. > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
