Napier's Bones
thingiverse
Human: Check out these 10 Napier bones along with a handy guide piece, all part of this SCAD package. You can access the OpenSCAD code included here too. \nThing:183676 by gyrobot showcases Napier bones on one side; this four-sided version lets you multiply numbers under 11111. \n\n Instructions\nNeed more details on using Napier's bones? There's plenty online, and Chris Sangwin's article "Arithmetic, Bones and Counting" is a great place to start - http://plus.maths.org/content/arithmetic-bones-and-counting
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