Today somebody told me which made me think that he described some kind of
sundial. It should be in a (public) passage in the European Patent Amt in
Munich Germany. (Not the one in the German Patent Amt!). I checked the book
'Sonnenuhren Deutschland und Schweiz' (1974 edition) but could find it.
Chris Lusby Taylor wrote:
Bill Maddux gives a very logical reasoning to the subject of how
accurately one can read a sundial, assuming the reading is of the centre
of a symmetrical shadow line with fuzzy edges.
I am inclined to agree that judging the centre of such a shadow must be
easier than
