Wednesday, April 9, 2008

Before Calculator

What was before calculator to calculate the numbers? The Slide Ruler was the one which was the mathematical tool for addition, multiplication, logarithmic and other calculations, a way back than computer was invented.
The Slide Ruler was first invented by William Oughtred in 1625 and the first pocket-sized scientific calculators was introduced by Hewlett Packard in 1972.
Follow the link to learn more about the history

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