I found this picture.
An old mathematician has devised this tool. It is about conic sections.
What does it do? I can't figure out.
Maybe only Arab users can answer this question. The script is written in Arabic.
I understand some of the words such as "برکار" which means compass. And "تام" meaning universal; complete.
It seems this is designed to draw any conic section. But is that possible?
From the translation of the text in the picture, it turned out to be a universal conic section drawer compass.
Now my question is how does it do that?
the most relevant place to ask this, I think, must be here. Because here may be some people who have seen this tool once.
This is a compass, a device for drawing circles by rotating a pencil. The marks measure the angle of the compass (and thus the radius of the circle). The original image can be found on Wikimedia commons.