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Arithmetic brought about the invention of logarithms by John Napier and logarithmic scales by Edmund Gunter. In , William Oughtred used these two inventions together and invented the slide rule which lasted until modern times when the scientific calculator became popular in the early s.

The abacus, called Suan-Pan in Chinese, as it appears today, was first chronicled circa C. The device was made of wood with metal re-inforcements. In Japanese, the abacus is called Soroban.

The design of the schoty is based on a pair of human hands each row has ten beads, corresponding to ten fingers. The abacus is operated by sliding the beads right-to-left. If you hold out both hands in front of you, palms facing out, you will see that your two thumbs are beside each other and two sets of 4 fingers spread out from there. Similarily, on the schoty , each row has two sets of 4 beads of the same colour on the outside, representing the two sets of 4 fingers and the two inner-most beads of the same colour representing the two thumbs.

The "home" position for the beads is on the right hand side. The bottom-most row represents 1s, the next row up represents 10s, then s, and so on. So, counting is similar to counting on one's fingers, the beads move from right to left: Careful observers will note that the metal rods, on which the beads slide, have a slight curvature to prevent the "counted" beads from accidently sliding back to the home-position.

There have been recent suggestions of a Mesoamerican the Aztec civilization that existed in present day Mexico abacus called the Nepohualtzitzin , circa C. Since it was made from perishable materials it is impossible to know whether such a tool ever existed.

There is also debate about whether the Incan Khipu was a three-dimensional binary calculator or a form of writing, or both. According to the author, multiplication and division are easier using this modified abacus and square roots and cubic roots of numbers can be calculated.

The abacus is still in use today by shopkeepers in Asia and "Chinatowns" in North America. The abacus is still taught in Asian schools, and a few schools in the West. Blind children are taught to use the abacus where their sighted counterparts would be taught to use paper and pencil to perform calculations.

One particular use for the abacus is teaching children simple mathematics and especially multiplication; the abacus is an excellent substitute for rote memorization of multiplication tables, a particularily detestable task for young children.

The abacus is also an excellent tool for teaching other base numbering systems since it easily adapts itself to any base. The abacus, as a portable computing device, continued to evolve into the modern slide-rule, the last mechanical evolution of a portable calculating device before the electronic era brought about digital calculators.

In the Hewlett Packard HP scientific calculator made the slide-rule obsolete. A few decades later scientific calculators evolved into programmable calculators able to display graphs and images on bitmapped LCD screens.

In the 21st century, portable counting devices rarely exist as separate entities. Instead they are simulated as Apps running on desktop computers, smartphones and tablets. Civilization, which began recording history with a stylus and a clay tablet thousands of years ago is re-using those original terms today. The tablet is made of marble x57x5cm and was used by the Babylonians circa B.

Photo from the National Museum of Epigraphy, Athens. See endnote for link to video on using a counting board. The Roman hand-abacus was the first portable counting board. It is thought that early Christians brought it to the East. Roman culture could have been introduced to China as early as C.

The Schoty is a Russian abacus invented in the 17 th century and still used today in some parts. Based on the ten fingers of a pair of hands, the numbers on the right indicated the multipliers for the beads in the corresponding row. Click for a larger view. The Lee Kai-chen Abacus is a further refinement of the Chinese abacus.

Around the 11 century, the invention of money added a new dimension to trade. Merchants who previously traded goods and just kept track of inventory now needed to calculate the cost of those goods and currency conversion calculations were required if the trade was with a different culture. In , Leonardo of Pisa, also known as Fibonacci, published Liber Abaci Latin for The Book of Calculation , with examples that merchants could reference in their daily transactions, showing the superiority of calculations with Arabic numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 over the Roman numbers and counting boards, which were common at that time.

Fibonacci learned of the Arabic numbering system when he accompanied his father, a merchant, to various Arab ports in the Mediterranean Sea. History of Science, vol.

Is there a strong enough connection between the milestone and the location of the plaque? I support the milestone and in particular Lyle's citation improvements. As Lise suggests, a stronger statement to plaque location is needed. I like the notion of recognizing the abacus as computing milestone.

The date situation seems quite understandably to be a bit confused. I know I can't help determine an appropriate date but I hope some of our historians can get together and decide what an appropriate date might be. If a date is necessary at all. I took the liberty of rearranging the citation a bit and show here both the original and the version I propose. The abacus, which was already used in China by C. A typical abacus is constructed as a bamboo frame with beads sliding on rods. An abacus helps people keep the track of numbers as they calculate, and its invention was the first step towards to the design of automatic calculators.

The abacus was the first known calculating mechanism. According to historical records, it was used in China by at least C.

Hungryroot is a brand of fresh healthy indulgent foods using vegetables and other wholesome ingredients to recreate the comfort foods that people know and love. The Salamis Tablet is the oldest surviving counting board. I suggest adopting Feisel's recommended wording. Fibonacci learned of the Arabic numbering system when he accompanied his father, a merchant, to various Arab ports in the Mediterranean Sea. Transmission of Chinese Mathematics to Korea and Japan.

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