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Ships within 48 hours · Estimated delivery Aug 25 - Aug 30
Compact and travel-ready at 6" x 6" x 1"
Woods are 1/4" thick
depends on where you put the water tower piece
Engrave a name or short message on the block (up to 45 characters)
Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:Cube Root Bone Compact and travel-ready at 6"Napier'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,
