Berechenbar (Napier’s Bones)


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A laser-cut wood tool for multiplying large numbers. The initial state shows a regular times-table from 1 to 9, but by sliding the rods it is possible to multiply large numbers with little effort.

Made in laser-cut wood by Jean-Claude Constantin. Jean-Claude Constantin lives in Germany, where he designs and manufactures many different laser-cut wood puzzles, as well as metal puzzles and magic tricks.

Object Tool for doing math multiplying
Difficulty Level 7 – Challenging
Brand Jean Claude Constantin
Types European Wood Puzzles, Jean Claude Constantin
Dimensions 5.3 in x 4.7 in x .1 in / 13.5 cm x 12 cm x .3 cm