write a short note on any two early computing device
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Answer:
1) Abacus : Abacus is a manual calculating device that can traced the ancient counting boards. It first used in Mesopotamia around 3500 BC It consisted of pitted boards with pebbles or wires. But the modern abacus is probably originated in the 15 th century China..The modern abacuses are found in different forms such as Chinese abacus, japanese abacus and Russian abacus..it consists of a rectangular frame carrying a number of Rods or wires. The rods have breads that can be moved along The rods..Abacus is used for performing calculations like addition,substraction, multiplication and division.Etc.
2) Napier's Bones : it is a calculating device invented by Scottish mathematician Sir Jhon Napier in the 17 th century Napier's Bones are the number rods that can be used for multiplying a long number by a single digit number. Each rod is devided into 10 squares the top square has a digit,with the multiplication table of that digit written vertically downards. The digits of the multiplication table is split by a diagonal line. A special rod having the digits 1 to 9 arranged vertically downward, was used to respresent the multiplier.