Calculator you might be wondering how this came out or who started or invented it or how the calculator was develop. For those who want to have a glimpse on who was responsible for the existence of the calculator here is a little insight about it.

As we all know the oldest calculator in the world is the abacus.

During 1600 John Napier invented Napier bones used for multiplication which was based on Arabian lattice an ancient numerical scheme.

In 1620, William Gunter develop slide ruler which is a logarithmic rule for division and multiplication with the use of dividers.

William Outghtred invented circular slide rule in 1622 and described rectilinear version in 1633.

The first mechanical calculator was invented in 1623 the calculating clock by Willhelm Schickard where in it uses the Napier’s bones version for multiplication that has a mechanical adding or subtracting calculator basing on gear or with mutilated one for carry.

In 1642 the development of mechanical calculator started by Blaise Pascal which is the Pascaline.

Gottfried Leibniz developed Stepped Reckoner in 1673 using the gear wheels where the four functions was performed but erratically worked because of error in carry mechanism.

In 1820 Charles Xavier Thomas’s Arithmometer was developed.

Victor Schilt exhibits an adding machine that is a key-driven in 1851 at Crystal Palace Exposition at London.

The first world printing calculator Scheutz Difference Engine was completed in 1853.

During 1872 this was the period where the development of commercial mechanical calculators was a successful started and it developed and get better as time goes by. And we see the result.