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    Re: Old Sextant on German money
    From: Alexandre Eremenko
    Date: 2007 Mar 10, 09:23 -0500

    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
    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.
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