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The resulting letter or number on the other gear(s) could be the answer
Without turning the wheels
Compact and travel-ready at 6" x 6" x 1"
Woods are 1/4" thick
Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:Cube Root Bone The resulting letter or numberNapier'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,
