This One Goes to 13

Jim Tolpin’s article “Secrets of the Sector” in the June 2011 issue has stirred up a lot of interest and discussion among our readers. A sector is a way to eliminate arithmetic, especially [...]

Make a Sector From a Crappy Folding Rule

As Jim Tolpin’s article on sectors from the June 2011 issue is getting into the hands of readers, we have had a few questions about the tool. One question is, of course: “Where can I buy one?” I [...]

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