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 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.
>
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>
>
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