Computer’s history

Computer’s historyComputer’s history

By arehman baig

In this presentation we will study how these machines work

In this presentation we will study how these machines work

Abacus

Napier’s bones

Abacus

Napier’s bones

AbacusAbacus

• It works with beads free to move around on wires which are used for addition and subtraction

• It works with beads free to move around on wires which are used for addition and subtraction

Napier’s bones or rodsNapier’s bones or rods

• In 1614 john Napier invented a device called Napier's bone or rods. These rods helped to multiply and divide. they were fast and accurate.

• In 1614 john Napier invented a device called Napier's bone or rods. These rods helped to multiply and divide. they were fast and accurate.

Napier’s boneNapier’s bone