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    Re: Old Sextant on German money
    From: Henry Halboth
    Date: 2007 Mar 11, 00:02 -0500
    A heliotrope is a device for reflecting the sun's rays to a distant point to aid in long distance observations; a similar device for reflecting the moon's rays is called a selenotrope - both are used or were used in geodetic surveying. What the vize prefix means ion this context, I don't know.
     
    Henry
    ----- Original Message -----
    Sent: Friday, March 09, 2007 9:10 PM
    Subject: [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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