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kvision, I didn't have the formula you spoke of when you gave the chord length and arc height at center but when you draw this on cad the radius is 22.6563" I've drawn the atlas switch in ACAD 2000, using digital calipers for my measurements and grouping the drawing where it can be pasted as a block. I have it on disc somewhere. If you want I can try to find it and send it to you as a e-mail attach. With all the crap going on on the internet I can send a copy (if I can find it) snail-mail. My e-address is tweet469@netzero.net. By the way if I recall correctly I drew Peco #6 also & because of its European based design there was quite a bit of difference.
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