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Frank,
You indeed found it!
The "sextant" from the 10 marks bill.
Moreover, the site tells you where exactly in
Gottingen this instrument is located!
It is in physics institute of the University.

Alex

On Fri, 9 Mar 2007 FrankReedCT@aol.com wrote:

> 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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