There's a Better Way: Drawing an Ellipse
Build a jig to draw a perfect ellipse with just two scraps of wood and a few nails
Chuck Miller demonstrates tipster David Kalin’s better way to layout an arched opening with the aid of an easy-to-make jig. All you need to build the jig is a sheet of plywood, a pencil, and a few strategically placed nails.
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I read this a few years ago to do a portico. It was a little hard to find this time. it is without a doubt the best way to lay out a elipse