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?

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