# Short History of Computer

**2500 BC The Abacus**

. Abacus is the world’s first calculating device.

.Abacus is the first known calculating machine used for counting

.It is made of beads and rods. It is mainly used for addition, subtraction, multiplication, and division.

. Abacus design by Chinese mathematicians around 5000 B.C

. Ancient times, it was used for calculating the number.

. Abacus performing a basic operation like addition, subtraction, multiplication, and division

. In the early age, before the invention of computer peoples was used for counting sticks and stones

** 1614 AD Napier’s Bones **

.Napier Bones invented by Scottish mathematicians John Napier

.A set of bones consisted of 9 rods; for each digit 1 through 9 and a constant road for the digit ‘0’

.He has invented the logarithm in 1617 and he got the idea for a printed table. The printed table he was made alternative

**1633 AD The Slide Rule**

. Slide rule invented by William ought in 1622

. It is based on Napier’s ideas about logarithms.

. The primary use for slide rule is multiplication division, roots,

Logarithms and trigonometry.

**PASCAL’S Calculator**

Blaise Pascal was a French mathematician, he has invented the first mechanical calculator in 1642 called Pascal calculator

. Pascal calculator helped mathematical calculations.

. Additions and subtraction easily.

**1642 AD The Rotating Wheel Calculator **

It was first developed by a French Philosopher, Blaise Pascal

It consists of gears and levers. This is a predecessor to

Today’s electronic calculator

**1822 AD The Difference Engine **

could perform mathematical tasks such as calculating successive values of algebraic expressions and also prepare mathematical tables.

After working on the difference engine for 10 years,

Babbage proceeds to design an analytical engine, which could perform the task-based instructions.

Unfortunately, his analytical engine remained a dream.

** **It was built by Charles Babbage, the British Mathematician, and Engineer

Babbage is called the “Father of today’s computer”.

**1890 AD Hollerith Tabulating Machine **

It was developed by Herman Hollerith

It was designed by using punched cards

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