any idea what this is

[yoeri]

any idea of the year?
looks like it is something very different from what the seller said

[CINDERS]

Egyptians etc. would have used an alidade, of which your instrument is a modern version. Slow, but it works.

Yes I think the Egyptians built things to last very well and on a truly magnificent scale, the mathematical references made about the pyramid of Giza are very interesting according to some it is missing its cap stone which was purported to point to the constellation of Palade's from which to some here on earth we came from.

And before we gesticulate that I am off the planet we know less about the ocean and what's down there than we do with what's up there go ponder that one.......

[yoeri]

learned a lot again

it was sold to me as beeing a piece that was to be attached to a canon.
in a way you could say it was

didn't know about these devices but it is a nice add-on to the colection of clinometers.
and the best part - i have 3 of them...