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Ships within 48 hours · Estimated delivery Aug 2 - Aug 7
Designed by our founder Dave Janelle and handcrafted in our family workshop in Hudson
wipe gently with a dry cloth
The goal of this puzzle is to fit all 18 wooden pieces back into the frame
which turns a novelty into something worth keeping
Full solution is available by request either with your order or by email
Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:No Designed by our founder DaveNapier's Bones is a handcrafted wooden reproduction of the multiplication aid invented by John Napier in 1617. Before calculators, students and tradespeople used the marked rods to multiply, divide, and find roots. The base set ships with two complete sets of rods (0 9), a storage base, a wood cover, and printed instructions with worked examples. Optional square root or cube root bone add ons at checkout. Includes: storage base, 2 sets of rods 0 9,
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