Wearable Abacus from the Qing Dynasty 1644 CE -1912 CE
Wearable Abacus from the Qing Dynasty 1644 CE -1912 CE
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Wearable Abacus from the Qing Dynasty
A functioning abacus ring from the Qing Dynasty (1644-1912), exhibited at the Cheng Dawei Abacus Museum in Huangshan City, China. Steve Mann mentions it as an early form of wearable "computer": Here i...