Quote Originally Posted by RPMiller View Post
So? We are talking about a fantastical device aren't we? An ellipse can be drawn with two central points and piece of string. If you can do that, surely some futuristic steam punk scientist could create the intricate gearing to make it work.

Don't limit yourself or your imagination.
Don't forget the Double Slider Trammel Ellipse Tracing Linkage (gotta love that name!)

...or any of these wacky linkages...

-Rob A>