Nowadays, calculators and computers are essential tools for scientists and engineers. A few decades ago, however, an ingenious calculating device called the slide rule was in every engineer’s toolbox. This Web site provides a glimpse of those long-gone days. It provides references materials on the care, feeding, and use of slide rules, a slide-rule marketplace, and step-by-step instructions for building your own slide rule.
Go to: http://www.sphere.bc.ca/test/sruniverse.html