Napier's Rods Small 320×252 Medium 640×504 Large 1024×806 Download Tiff Original 2400×1889 | (1.3 MB) Description Special rods used for multiplication, division, and extracting square roots. Keywords Abacus Galleries Miscellaneous Math Tools Source: William Dwight Whitney The Century Dictionary and Cyclopedia: An encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1889)
