From 5eca8642d5af4d2d3be41785416697786209031b Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 7 Sep 2016 18:04:08 +0100
Subject: [PATCH] lock-inframe-bracket: Add ref to Wolfram

---
 lock-inframe-bracket.scad | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lock-inframe-bracket.scad b/lock-inframe-bracket.scad
index b4b7f65..4001eaa 100644
--- a/lock-inframe-bracket.scad
+++ b/lock-inframe-bracket.scad
@@ -59,6 +59,7 @@ module oval(sz){ // sz[0] > sz[1]
 }
 
 module JoinCircs(jr){
+  # http://mathworld.wolfram.com/Circle-CircleIntersection.html
   R = tube_or + join_cr;
   r = lock_or[1] + join_cr;
   d = dist2d( [0,0], lock_0 );
-- 
2.30.2