Just sharing a curiosity...

[Externet]

Never saw before.  Several figures written different.

-Image borrowed from the web-

[Trurl]

Looks like a protractor to me. It is going from 0 to 90.

It does have many scales but it just looks like it is made for a map. There are many things it would be able to do on a map. Like taking the scale on the map versus actual distance.

That is my guess. What other pictures did the search engine show that were similar?

[StringJunky]

I think @CharonY knows German and might have a clue reading the words.

[Eise]

"About the quadrant.

How one should make the hour lines in the quadrants"

https://en.wikipedia.org/wiki/Quadrant_(instrument)