A 300-year-old Chinese Abacus Ring, Qing Dynasty, c. 1700s. Each rod has 7 beads to help calculate business transactions.
— History Defined (@historydefined) May 17, 2022
Photo via https://t.co/IdXsEKMSpO pic.twitter.com/jA29oeOZbZ
A 300-year-old Chinese Abacus Ring, Qing Dynasty, c. 1700s. Each rod has 7 beads to help calculate business transactions.
— History Defined (@historydefined) May 17, 2022
Photo via https://t.co/IdXsEKMSpO pic.twitter.com/jA29oeOZbZ
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