Interesting to learn more of the sacred geometry all the time. Compass and rule work was my favorite bits in high school geometry class. I can’t wait to add this to my layout repertoire!
A true ellipsis is, in my opinion, is one of the most beautiful shapes in the universe. Unlike an oval that is drawn with two mirrored radii (or three in the case of a true “egg” shape), the radii of the ellipsis continually change. It’s incredibly strong shape in structural terms and it’s one of the best shapes for table tops. There are many ways to draw an ellipsis. But here’s an old method that you don’t often see referred to these days. It’s simple and can be extraordinarily precise. This method can also be very helpful if you’re creating domed framing for any type of construction.
First, establish a horizontal base line then raise a vertical line.
Swing a semi-circle with a diameter based on the minor axis of the ellipsis.
Next, open the compass to the length of the major axis and strike a point to the base…
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Preindustrial Craftsmanship 
Can you do something with the dark pictures
Jennie
They don’ look dark on my screen. The originals are on Mr. Blaney’s Woodworker’s Musings. Try it here: http://dblaney.wordpress.com/2014/10/15/another-way-to-create-an-elliptical-12-or-14-plan/