John Napier, a Scottish mathematician, created logarithm tables to facilitate calculations. He also created a device using rods, also called Napier,s Bones to perform arithmetic calculations. These rods were widely used by accountants and bookkeepers.
genaral peoople used the concept of logrithms to develop the slide rule. with a modern slide rule you could not only perform the aritmetic operations, but also calculate squares, squares root, logs, cosine, and tangent. the slide rule was used till the middle 70,s.
