Hello Kurt, Congratulations on completing a challenging project. I would like to ask a few optical questions. Why did you use a lens at all? In my experience, a lens differs from an open aperture in that it distorts the path of the sun. For example, straight lines, if they are off-axis, are projected as curves. Even on-axis lines become shortened or lengthened non-linearly. Were you able to accommodate this into your design? (I don't know if a prism, as suggested by Ricahrd Pauli also distort the path of the sun)
A small flat circular mirror, with no lens, is more simple and compact design, but has its own limitations, too. Did you rule out this option? -Bill On Fri, Apr 20, 2018 at 12:10 PM, R.Pauli <m...@rpauli.com> wrote: > Spectacular! Techno-Modern-Gnomonics. > > Almost a reverse display, instead of shadow, the point of light is the > display. Sort of a reflecting gnomon -rather than a shadow. In my > translated page it is called a shadow - but should there be a different > term for a concentrated spot of light? Maybe a 'negative' display? > > For the next version, I would want to see a prism that eould expand and > colorize the light. Although I am unaware of the challenges of deploying > glass optics. > > Superb design. thanks > > Richard Pauli > > > On 4/20/2018 6:32 AM, Kurt Niel wrote: > > Hi all, > > proudly presenting my latest sundial within a primary school here in Upper > Austria: > https://kepleruhr.at/su-vs-wallern and > https://flic.kr/s/aHsm9EgPtL > Bending mirror because of the narrow lightwell. > > Cheers > Kurt > https://kepleruhr.at > > > > > ---------------------------------------------------https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > >
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