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The "1979 Observator geodetic sextant" differs from a "normal sextant" 
in the way the circle is divided. Where a normal sextant is divided in 
degrees (so 360 units to a full circle) the geodetic sextant is divided 
in gon (or grad) that have 400 units in a full circle. In The 
Netherlands the 400 grad system is widely in use, resulting in lots of 
geodetic equipment with this type of circles (see the Wild T2 theodolite 
in my collection). The geodetic sextant was especially made for geodetic 
network measurements.

P F wrote:
>
>
>  Nicol�s wrote:
>
>
>     For this purpose a nice instrument was constructed: the protractor or
>     "station pointer"...
>
>     Examples of the instrument can be found on my web-site:
>     http://www.dehilster.info/instrumenten/stationpointer1/index.html
>     http://www.dehilster.info/instrumenten/stationpointer2/index.html
>
>
> Ingenious - two instruments designed specifically for this purpose. 
> Wish I had one; it should be much quicker and more efficient than 
> plotting lines from shore features seawards.
>
> Browsing through your collection, in what way does a "1979 Observator 
> geodetic sextant" differ from what I imagine as a 'normal' sextant?
>
>
> >
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