Russian Abacus (14 ore 39 min, 21 nov 2018 anni – 14 ore 49 min, 1 lugl 2019 anni)

Descrizione:

The Russian abacus is also called a schoty. It came into use in the 1600s and little is known about how it came to be. It was specifically designed for counting rubles and kopeks.

Thee design uses a set of framed rods and a series of beads that are moved back and forth across the rods to conduct the count.

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