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Wolfgang,
Thank you very much for the 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 with respect to what
the observer measures the position  of the Sun
> Regards,
> Wolfgang
>   -----Urspr�ngliche Nachricht-----
>   Von: NavList@fer3.com [mailto:NavList@fer3.com]Im Auftrag
> von FrankReedCT@aol.com
>   Gesendet: Samstag, 10. M�rz 2007 03:10
>   An: NavList@fer3.com
>   Betreff: [NavList 2277] Re: Old Sextant on German money
>
>
>   Alex E wrote:
>   "This leaves open the question what sort of strange index mirror we see in
> this picture"
>
>   I finally have a lead for you. It does indeed have a split index mirror.
> The instrument is a "vizeheliotrop". What is a vizeheliotrop? That I don't
> know :-). There are some German web sites that describe it, but my German is
> not up to the task. Here are a couple of photos I found of the original
> instrument. This modified sextant may have been a precursor to the
> heliotrope which Gauss invented during his survey of the Kingdom of Hanover.
>
>
>
>   -FER
>   42.0N 87.7W, or 41.4N 72.1W.
>   www.HistoricalAtlas.com/lunars
>
>
>
>
>
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