The calculator of this is was developed by using mechanical components required metals strong bones etc. It was used for simple mathematical calculations some of the popular calculator using this is are:
Abacus
Historian started the history of calculation with the first mechanical tools abacus also known as suan-pan ('counting board' in Chinese language) or soroban in Japanese and appread in between 3000 years to 6000 years ago.It had its origin in ancient China Greece (Roman) Egypt and great silk road (located in southern part of former USSR and Central Asia). it was used for performing simple calculation like counting addition subtraction and multiplication of numbers.
An abacus consists of a rectangular frame carrying number of rods. made by divides each of these words into an equal operator parts the upper part is called heaven where as lower part is called earth the heaven consists of two pizzas the earth earth consists of forbids to its rod the value of hidden heaven what is perfect or this one is ever consists of 9, 11, 13 rods.
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