Machining rectangular gears?

In the book Five Hundred and Seven Mechanical Movements, Henry Brown shows a
diagram of two rectangular gears (drawing #30) that when meshed together
provide varying speed for the driven gear.
Anyone have any thoughts or references to a process for producing these
I could imagine a single tooth cutter and a dividing head. I suspect that
one would have to offset the gear when cutting the corners.
From the drawing a least, it appears that each tooth is of consistent depth,
so treating it as circular wouldn't really get it.
Just curious.
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Sounds like a job for a shaper.
Reply to
Carl Byrns
Of course as soon as I ask the question I stumble across this
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which covers the design and fabrication of elliptical gears. Similar issues I suspect.
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