Russian Abacus (14 h 39 m, 21 nov 2018 año – 14 h 49 m, 1 jul 2019 año)

Descripción:

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.

Añadido al timeline:

fecha: