Make your "chord bar" with lots of holes and several pin sizes and you've got a dual purpose tool, e.g.,

http://www.homemadetools.net/forum/l...r-finder-27455

In that thread, Paul Jones asked the purpose of the brass bar along the edge of the tool and I remarked that I had forgotten why I put it there.

This thread has reminded my aging brain why I did that. Of course, it marks the perpendicular bisector of the chord when the bar is used as described in my last post to find the center of circles.

In deference to your sensibilities I won't report the temperature here in LA. Let's just say the only white we'll have for Xmas will be the surf at the beach. See for yourself...

https://eatgoodstuff.com/resources/strandcam/