Sorry for my terrible error in writing the name. Of course the name is
Bernhardt and the object discussed is the 'Bernhardt-Walze'!
Helmut
----- Original Message -----
From: "Helmut Sonderegger (Tele2)" <[EMAIL PROTECTED]>
To: "Thomas Steiner" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, September 24, 2008 6:16 PM
Subject: Re: Bernhardt's gnomons
> As I read, the gnomon by Berhard ('Berhadt-Walze') is a bit more
> complicated than just the half analemma rotated. This, because the sun
rays
> are not orthogonal to the axis of the Berhardt-Walze and therefore it
needs
> some higher Maths. And as I remember the calculations show that there can
> exist some days where reading correct mean time is not possible. As I
> remember this happens the days near winter soltice.
>
> Helmut Sonderegger
>
>
> ----- Original Message -----
> From: "Thomas Steiner" <[EMAIL PROTECTED]>
> To: "Sundial Mailing List" <[EMAIL PROTECTED]>
> Sent: Wednesday, September 24, 2008 4:01 PM
> Subject: Bernhardt's gnomons
>
>
> > Dear all,
> >
> > I tried to collect information on Martin Bernhardt's special Gnomons
> > which takes into account the equation of time in a equatorial sundial
> > on a single scale to read off time, regardless of the date (almost -
> > once a year the gnomon has to be changed).
> > The idea is good and simple: just rotate half of the analemma (ok, a
> > projection) around an axis. The original idea came from John Ryder
> > Oliver (1834-1909) and Bernhardt lived from 1919 until 2000. It's
> > incredible that this was discovered that late. Do you know any sources
> > or other information on it? Do you know of any ideas/inventions that
> > were close? What did Oliver exactly do? ...
> >
> > For the German speaking among you, I wrote major parts of this smal
> > wikipedia article:
> > http://de.wikipedia.org/wiki/Bernhardtsche_Walze
> >
> > Thanks for help on anything related to the subject...
> > thomas
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> >
> >
>
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