paste picture of any four early calculating device and few lines on each
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Answer:
1.Abacus (ca. 2700 BC) ...
So human civilization invented the abacus, which the Computer History Museum suggests is “the oldest continuously used calculating tool aside from fingers.”
Though still in use in today, the abacus was merely the beginning of mankind’s interest in calculating machines, which have evolved radically over the years. Here we share with you a visual history of some notable calculating firsts.
2.Pascal's Calculator (1652) ...
Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in the mid 17th century. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen.
3.Stepped Reckoner (1694) ...
The step reckoner (or stepped reckoner) was a digital mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz around 1673 and completed in 1694. The name comes from the translation of the German term for its operating mechanism, Staffelwalze, meaning "stepped drum". It was the first calculator that could perform all four arithmetic operations.
4.Arithmometer (1820) ...
The Arithmometer or Arithmomètre was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. This calculator could add and subtract two numbers directly and could perform long multiplications and divisions effectively by using a movable accumulator for the result.
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