Donated by Helen Burgess former lecturer in Craft at the Ballarat School of Mines and the Ballarat College of Advanced Education. This abacus was purchased while Helen was visiting Asia. http://www.youtube.com/watch?v=CvsnftXXKdw Usage: check wikipediaRectangular abacus, Chinese style rosewood or blackwood with brass fittings on corners and dividing framework,13 rods, 65 lower beads, 26 upper beads. Gift of Helen BurgessManufacturing stamp on lower RHS inside frame: "1963 6" Unidentified Chinese characters on the framework behind the lower beads on both central vertical supports, on the LHS framework and on the centre portion of the lower framework.abacus, abacus chinese, rosewood stained, helen burgess, mathematics