Where was the first abacus used?

Answer 1

The first reported and substantiated use of an abacus, or abacus-like instrument was in Sumeria between 2,700 and 2,300 BCE - or roughly 4,700 years ago. This used a table of columns with each column equivalent to an order of magnitude above the previous column; just as we would have columns for x10, x100, x1000, x10000. During the next 2000 years various forms of this came into common usage across areas of the world (Mesopotamia, Persia, Egypt, India, China, Greece, Rome). Some were similar in appearance, while others used the same principals, but looked slightly different. For example the Roman abacus used a clay tablet with columns and counting stones (a counting board), while the Chinese version looked almost identical, but had fixed string columns with counting stones attached to them - similar how most people picture an abacus. The spread and variance in design of the abacus is probably due to the movement of early traders across the early trade routes (Silk Road etc.). The abacus is still made extensive use of today, as they are simple to use, fast and don't require batteries to operate them. The word abacus comes to us by way of Latin as a mutation of the Greek word abax. In turn, the Greeks may have adopted the Phoenician word abak, meaning "sand," although some authorities lean toward the Hebrew word abhaq, meaning "dust." Irrespective of the source, the original concept referred to a flat stone covered with sand (or dust) into which numeric symbols were drawn. The first abacus was almost certainly based on such a stone, with pebbles being placed on lines drawn in the sand. Over time, the stone was replaced by a wooden frame supporting thin sticks, braided hair, or leather thongs, onto which clay beads or pebbles with holes were threaded. A variety of different types of abacus were developed, but the most popular became those based on the bi-quinary system, which utilizes a combination of two bases (base-2 and base-5) to represent decimal numbers. Although the abacus does not qualify as a mechanical calculator, it certainly stands proud as one of first mechanical aids to calculation. Both the abacus and the counting board are mechanical aids used for counting; they are not calculators in the sense we use the word today. The person operating the abacus performs calculations in their head and uses the abacus as a physical aid to keep track of the sums, the carrys, etc. What did the first counting board look like? The earliest counting boards are forever lost because of the perishable materials used in their construction. However, educated guesses can be made about their construction, based on early writings of Plutarch (a priest at the Oracle at Delphi) and others. In outdoor markets of those times, the simplest counting board involved drawing lines in the sand with ones fingers or with a stylus, and placing pebbles between those lines as place-holders representing numbers (the spaces between 2 lines would represent the units 10s, 100s, etc.). The more affluent people, could afford small wooden tables having raised borders that were filled with sand (usually coloured blue or green). A benefit of these counting boards on tables, was that they could be moved without disturbing the calculation- the table could be picked up and carried indoors. With the need for portable devices, wooden boards with grooves carved into the surface were then created and wooden markers (small discs) were used as place-holders. The wooden boards then gave way to even more more durable materials like marble and metal (bronze) used with stone or metal markers.