Vintage wooden abacus Russia 19 century , 150+years old for Sale

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Vintage wooden abacus Russia 19 century , 150+years old For Sale

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Vintage wooden abacus Russia 19 century , 150+years old :
$6920.00

Vintage wooden abacus Russia 19 century.Genuine abacus that are 150 years old
The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times.
It was used in the ancient Near East, Europe, China, and Russia, millennia before the adoption of the Hindu-Arabic numeral system.
The exact origin of the abacus has not yet emerged. It consists of rows of movable beads, or similar objects, strung on a wire. They represent digits. One of the two numbers is set up, and the beads are manipulated to perform an operation such as addition, or even a square or cubic root.