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GALLERY: Decitrig Slide Rule

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The slide rule , also known colloquially in the United States as a slipstick , [1] [2] is a mechanical analog computer . [3] [4] [5] [6] [7] The slide rule is used primarily for multiplication and division, and also for functions such as exponents , roots , logarithms and trigonometry , but typically not for addition or subtraction. Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines.

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