Am 11.06.26 um 12:51 schrieb Bald Eagle:
> I acquired this interesting device as part of a lot of tools (in every sense of
> the words) and have yet to determine how it is used.
> 
> It is labeled "mechanical solution of spherical triangles"
> 
> And search as I might, I have found nothing on the interwebs that shows a
> similar device or explains how it might be used.
> 
> The attachments are simply clamped onto the edge, like a caliper.
> I have no idea if there were any more parts intended to go along with it.
> 
> Does anyone have any ideas?
I googled the words on the note attached and came up with the hint to a 
nautrigon:

https://www.abebooks.com/first-edition/Description-Nautrigon-Directions-Use-Instrument-Solving/588224941/bd#&gid=1&pid=1

Best regards
Michael

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