What is an apparatus consisting of a frame containing a number of parallel wires on which there are rows of beads which can be moved left and right?
Abacus Calculation Russian abacus Abaci Nepohualtzintzin Abacus (Aztec) Cranmer abacus Abacuses Counting frame Abacus Abacist Abacus (mathematics) Abacists Bead frame Abacus arithmetic AbacuS Counting frames Abbacus Reckoning frame
counting frame abacuses abacist reckoning frame nepohualtzintzin abacists abacus aztec abacus arithmetic abacus mathematics counting frames cranmer abacus bead frame abbacus russian abacus abacus calculation abacus abaci
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Abacus