At a first guess, an answer to the second question may explain the first: I would guess the diagonal lines (the 19 hour appears to be on a line parallel to the one running right through the dial) are hour lines for a different gnomon, perhaps roofline, corner, etc.
Dave On Mon, 13 Aug 2001, Steve Lelievre wrote: > Hi, > > A friend has sent me a couple of pictures of a sundial at Montegufoni in > Tuscany, and has asked me how it works. I can't figure it out fully. > > On the face of it, we seem to have a fairly ordinary vertical decliner using > a nodus, but we don't understand the hour numbering. They don't seem to be > modern, and I can't make sense of them as Italian Hours either. The pictures > were taken at 8 am (during daylight saving time). Note that they go > 16...13...19. > > Also, what is the diagonal line cutting across the first picture? > > Thanks, Steve > > http://www3.ns.sympatico.ca/dave.chapman/Sundials/European%20Sundials/image/ > 1.jpg > http://www3.ns.sympatico.ca/dave.chapman/Sundials/European%20Sundials/image/ > 2.jpg > > > > >
