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Slide rule
The slide rule is a mechanical analog computer, that was used in the past for arithmetic.
Explanation
Always use your calculator in arithmetics. That prevents errors, and you save a lot of time. Do not be ashamed if you take your calculator even for simple tasks. Thereby you develop routine.
HistoryUntil around 1980, the slide rule, together with 'the' Abramowitz & Stegun, formed the standard computing tool for technicians, physicists and engineers. |