We like mechanical calculators like slide rules, but we have to admit that we had not heard of the Ott Derivimeter that [Chris Staecker] shows us in a recent video. As the name implies ...

You might have missed it, but slide rules show up in Titanic, This Island Earth, and Apollo 13. If you are a fan of the original Star Trek, Mr. Spock was seen using Jeppesen CSG-1 and B-1 slide ...

NMAH Trade Literature Collection, Smithsonian Institution Libraries. AHB2013q009218 Illustration from Complete, Semi-Programmed Teaching Instructions for the Use of Elementary Simplex Math Slide Rule, ...

Subsequent slide rules added scales for trigonometric, powers and root computations. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.