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.

Slide rules are analog computing devices marked with linear or logarithmic scales, some on a moving slide and some stationary on the base of the instrument, so that two numbers may be added or ...

I HAVE read with great interest the abstract of the paper on the invention of the slide rule, by Prof ... and rapidly by sliding the edges of logarithmic scales together than by using compasses ...

Logarithms are a common idea today ... But it didn’t. If you know how a slide rule works, you’ll find you already know much of what the video shows. The clockmaker was one of the people ...

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 the electronic calculator, in 1974, the slide rule was used by scientists and students to perform calculations in mathematics and physics. The alternative where 4 and 5 figure logarithm tables.