Magruder, Kerry2016-04-132016-04-132016Kerry Magruder, "The Abacus: Introduction," Lynx Open Ed, 2016.http://hdl.handle.net/11244/33377The Abacus was an instrument useful for various mathematical computations. This learning leaflet provides step-by-step instructions for the basic operations of the abacus.Galileo EngineerGalileo's WorldMathematics.Engineering, General.InstrumentsLearning Object