Slide rules depend on Napier’s discovery of logarithms. Besides being a strange key on your scientific calculator, Logarithms (or logs) were very important in the pre-computer math world.

Ollech & Wajs revived its "computer" watch from the 1960s, offering further proof that this underrated watch feature is ...

Primarily for multiplication and division, the slide rule has two stationary sets and one sliding set of numbers in the center. To multiply, numbers are added; to divide, numbers are subtracted.

Before there were apps for tablets and smartphones, before mathematics education software was easily installed on personal computers, before electronic calculators entered professional practice and ...

You have to really like slide rules to build your own ... If you’ve ever tried to manually draw an axis using a computer program — attempting to automatically set reasonable tick marks ...

Slide rules such as this 20 inch example were the principal instruments for mathematical calculation until the development of the electronic calculator in the 1970s. It played an incalculable role ...