When did Oughtred invent the slide rule?

Answer William Oughtred, an English mathematician and Church of England clergyman, invented the first slide rule in 1622. Though he wrote many scholarly mathematical books, he is still best known for his ... Read More »

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What was the name of the book in which William Oughtred first described his slide rule?

The mathematician William Oughtred first described his design for the slide rule in "Circles of Proportion and the Horizontal Instrument" published in 1632. In this book, Oughtred also outlined his... Read More »

When did the calculator replace the slide rule?

As calculators began to drop in price in the 1970s, people started using slide rules less and less often. Now, when a calculator can be purchased for only a few dollars, slide rules are virtually u... Read More »

How to Use a Slide Rule?

Suppose you want to compute 8+15 but you forgot how to add. Would it help if you had two yardsticks? Then you could just line them up so that they are offset by 8 inches. If the 0 lines up with the... Read More »

Uses of a Slide Rule?

Slide rules are essentially analog computers, once widely used for the same purpose as modern digital calculators. These mechanical devices are composed of sliding scales that allow users to perfor... Read More »