Russian Abacus (14 ч 39 мин, 21 ноя 2018 г. – 14 ч 49 мин, 1 июл 2019 г.)
Описание:
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.
Добавлено на ленту времени:
Дата:
14 ч 39 мин, 21 ноя 2018 г.
14 ч 49 мин, 1 июл 2019 г.
~ 7 months