Swallowtail Joints

I remember when I first starting seeing these in my mind's eye and trying to describe them; the underside breaks on the post edge and feathers out like a swallow's tail. Since this was well before 3-D drawings became so common, we had to cut a sample to see it. The first one we cut showed up where cupola hips land on their supporting posts. Since then, braces and arches have generated these same pointy tails.

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