Reply To: Woodworking Basics — How to Use a Sector
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There was a discussion thread about sectors a while back on a forum (cannot remember which one), and although the verbal explanation eluded my grasp at the time, there was mention that some old folding rules have lines that radiate out from the center pivot (hinge), allowing them to be used as sectors.
Here is another video by Chris S. showing how he converts a crappy 4-fold folding rule into smaller sector. Same idea as the big boy.
http://www.popularwoodworking.com/article/make-a-sector-from-a-crappy-folding-rule