Before the smartphone, the laptop and the pocket calculator, there was a powerful mechanical computer. Our new series, Tools of the Trade, begins with a look at the slide rule.

I recently started getting interested in slide rule calculators and I was considering buying one. Meanwhile, using online virtual slide rules to practice, I noticed.

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Slide rules are simple devices that can do some very complex mathematical calculations. They put into use some of the theory you learned about logarithms in high-.

Slide rules.