Slide-rules

Slide-rules

Slide-rules are mechanical calculating devices that were widely used in the past for performing mathematical calculations. They consist of a ruler-like device with logarithmic scales engraved on it, which can slide back and forth against another fixed ruler. The scales on the slide-rule are arranged in such a way that multiplication and division can be performed by adding and subtracting the logarithms of the numbers being multiplied or divided. Slide-rules were widely used by engineers, scientists, and mathematicians before the advent of electronic calculators. The use of slide-rules dates back to the 17th century, when the first logarithmic scales were developed. However, it was not until the 19th century that the slide-rule as we know it today was developed. The slide-rule became an essential tool for engineers and scientists, and was used extensively in the fields of physics, chemistry, and engineering. The slide-rule was particularly useful in the design of machinery, bridges, and other structures, where precise calculations were required. The use of slide-rules declined with the advent of electronic calculators in the 1970s. However, slide-rules are still used by some engineers and scientists who prefer the tactile feel of a slide-rule, or who work in environments where electronic devices are not allowed. Slide-rules are also popular among collectors and enthusiasts, who appreciate the beauty and craftsmanship of these mechanical devices.

mechanical, calculating, logarithmic, scales, engineers

— Paul Martinez

CITATION : "Paul Martinez. 'Slide-rules.' Design+Encyclopedia. https://design-encyclopedia.com/define/slide-rules?E=397073 (Accessed on October 14, 2026)"