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    Re: Old Sextant on German money
    From: Frank Reed CT
    Date: 2007 Mar 9, 21:10 EST
    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.
    42.0N 87.7W, or 41.4N 72.1W.

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