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- DictionarySlide rule/ˈslīd ˌro͞ol/
noun
- 1. a ruler with a sliding central strip, marked with logarithmic scales and used for making rapid calculations, especially multiplication and division.
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noun
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Mechanical analog computer
A slide rule is a hand-operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry. It is one of the simplest analog computers. Wikipedia