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, wood cover, and instructions sheet. Dimensions: 7.5 x 7.5 x 0.75 inches. Variants: base set, +square root bone, +cube root bone, or both. Use case: STEM education, Montessori math, homeschool, math classroom, teacher gift. Engrave up to 45 characters on the case. Companion: Genaille-Lucas Rulers for visual multiplication. Handcrafted by Creative Crafthouse in Hudson, Florida.
