A ruler with a sliding central strip, marked with logarithmic scales and used for making rapid calculations, especially multiplication and division.
- An analog calculator designed along the principle of a slide rule, it utilizes logarithmic and inverse logarithmic scales to quickly provide you with the correct firing solution.
- Oughtred described the slide rule in 1622 but the circular slide rule was not described by him until 1632.
- This includes a detailed discussion of the use of the slide rule in making calculations governing the adjustment and operation of looms and weaving equipment.
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