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Keywords: ABACUS
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Proceedings of the Institution of Civil Engineers (1953) 2 (4): 269–310.
Published: 01 July 1953
... cmss.bar, when the a b o s is put in the right position. The prinoiple underl* the Fig. 23 E- h A C W tg0 ration of the abacus is the representation of a number hy means of beade. Any of five beads below the WOSB bar wllirepresent one unit, end any of the two abovefive units. To represent a number, any one...
