History of Abacus

	Revision 15 . . November 22, 2001 3:53 am by (logged).192.137.xxx [added unicode]
	Revision 14 . . November 2, 2001 10:55 pm by (logged).203.83.xxx [link to slide rule..]

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Difference (from prior major revision) (no other diffs)

Changed: 9c9

The Japanese eliminated one bead each from the upper and lower deck in each column of the Chinese abacus, because these beads are redundent. That makes the Japanese soroban more like the Roman abacus. The soroban is about 3 inches tall. The beans on a soroban are usually double cone shape.

The Japanese eliminated one bead each from the upper and lower deck in each column of the Chinese abacus, because these beads are redundent. That makes the Japanese soroban (十露盤) more like the Roman abacus. The soroban is about 3 inches tall. The beans on a soroban are usually double cone shape.