Here I demonstrate a "Do Nothing Machine" also knows as a Trammel of Archimedes. Although it is known as a do nothing machine you can in fact use it to draw an ellipse! In the second half of the video the mathematics are shown to prove the elliptical shape that can be drawn.

https://youtu.be/fusHdCxWgE8

Isn't it the same you posted last week? You should really work on your video editing ?

Hey Morten - No it's a different version, but yes of the same topic - in this one I explain some of the underlying mathematics. Would love some tips on video editing - do you know of any tutorials?

Well it's the same video you're linking to in both topics