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    Re: Old Sextant on German money
    From: Alexandre Eremenko
    Date: 2007 Mar 10, 09:15 -0500

    
    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---.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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