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 gears?
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.
-jeff