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Dear Wolfgang,
Thank you for your explanation.

> As far as I understand the description the
> Vize-Heliotrop is a sextant
> equipped with an additional mirror which
> reflects the image of the sun to a
> distant point. It is not used for measuring
> then but for marking the
> position of the observer for another
> observer at the distant point.

It remains to understand what angle the observer
was supposed to measure. It is not the Sun altitude with
artificial horizon because the horison shades are removed.
So apparently this is either some horizontal
angle, or an angle between the direction to the Sun
and some direction on the land (a signal from another
vize-heliotrope??)
The additional mirror will indicate to a distant observer
not only the position of the first observer but also
the inclination of the index of the first observer.
Anyway, I have no clear
understanding of the whose scheme yet.

Will try to find in the Gauss Werke.

Alex.



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