Replica, made in 1974, of a Roman hand abacus. The counters slide in grooves. Like the Japanese abacus the counters above the bar are worth five and...
stem solid icons collection.science, technology, engineering, physics, chemistry, mathematics, engineering, computer science, astronomy, robotics, nanotechnology, artificial intelligence, genetics - 算盤 幅插畫檔、美工圖案、卡通及圖標STEM - 主題, 工程技術, 人工智能
Young boy learning how to use an abacus at the Lycee, a French primary school in London. Original Publication: Picture Post - 8051 - A French School...歸檔, 計數機, 學校建築
the smaller sand stone columns of the great hypostyle hall found in the karnak temple complex - 算盤 個照片及圖片檔
