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« A History Blank, Empty and Missing Things #76--the American Bison Extermination Map | Main | A Terribly Short Illustrated Note on the History of Pocket Protectors »

June 13, 2011

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Charles

Your article reminded me of even more ancient calculating methods that were precursors to the abacus. I saw some extensive web documentation of these calculators made from rope, but alas I could not find that page. So I'll give this link as a tantalizing glimpse of what is out there.

http://incas.homestead.com/quipu/quipu_video_elearning.html

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