There is a description of the TNO "jellyfish", as it was affectionally known, in a paper by J van der Eijk, "Instrumentation for Solar Studies", in the *Proceedings of the CIE Intersessional Conference on Sunlight in Buildings*, Bouwcentrum International, Rotterdam 1967, and reprinted as Publication 241 of the Research Institute for Public Health Engineering TNO, Delft. A more accurate instrument on similar lines was Gunnar Pleijel's "Globoscope", a convex paraboloid whose mirrored surface reflected a stereographic projection of the solar orbit and its surroundings. (G Pleijel, "The Computation of Natural Radiation in Architecture and Town Planning", Bulletin 25, Statens Namnd for Byggnadsforskning, Stockholm 1954). A cheaper Globoscope, based on a vehicle hub cap, was described by Professor P F O'Brien, of the University of California, Los Angeles, in the journal *Illuminating Engineering. * I don't have the reference handy. John Lynes
On Wed, 26 Oct 2022 at 01:46, John Pickard <john.pick...@bigpond.com> wrote: > Good morning, > > Has anyone come across this dial-related device? > > > https://picclick.co.uk/ARCHITECT-TOOL-Window-SUNLIGHT-SUN-ELEVATION-Enraf-144741549298.html > > Cheers, John. > > Dr John Pickard. > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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