How did they figure out the shape of non-rotating thing?

A hyperbolic hyperboloid with circular base is both a ruled surface and a surface of revolution.

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>>8604067
>>8604111
>hyperboloid

https://en.wikipedia.org/wiki/Hyperboloid

>>8604124
And your point is?

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>>8604132
that you are fucking stupid

>>8604132
If you add a second reverse hyperboloid to the to top it would solve the problem no?

>>8604067
>shape of non-rotating thing
Hyperbola. I'm sure there's a math proof out there somewhere.